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Articles 1 - 30 of 53
Full-Text Articles in Life Sciences
Physiological And Chemical Characteristics Of Five Cultivars Of Cynodon, C C.C. Gomide, L.R. De A. Rodrigues, T.De J.D. Rodrigues, R A. Reis, D A. Banzatto
Physiological And Chemical Characteristics Of Five Cultivars Of Cynodon, C C.C. Gomide, L.R. De A. Rodrigues, T.De J.D. Rodrigues, R A. Reis, D A. Banzatto
IGC Proceedings (1997-2023)
The experiment was carried out at UNESP, Brazil, to evaluate five Cynodon cultivars: (Cynodon nlemfuensis Vanderyst cv “Tifton 68”, Cynodon spp. cv “Tifton 85”, Cynodon dactylon cv “Florakirk”, Cynodon nlemfuensis Vanderyst var. nlemfuensis cv “Florico” e Cynodon nlemfuensis Vanderyst var. nlemfuensis cv “Florona”). Plants were sampled once a week from 14 to 84 days of growth to study physiological characteristics and at 14-day intervals to study chemical characteristics. The following variables were studied: DM production, leaf/stem ratio, leaf weight/total dry matter ratio, relative growth rate, chlorophyll contents, leaf area, specific leaf area, LAI, and the contents of CP, NDF, …
Canopy Characteristics And Growth Rate Of Bahiagrass Monoculture And Mixtures With Rhizoma Peanut, N. Caram, Lynn E. Sollenberger, Marcelo O. Wallau, C. H. Wilson
Canopy Characteristics And Growth Rate Of Bahiagrass Monoculture And Mixtures With Rhizoma Peanut, N. Caram, Lynn E. Sollenberger, Marcelo O. Wallau, C. H. Wilson
IGC Proceedings (1997-2023)
Understanding relationships among canopy light interception (LI), canopy height and structure, and leaf area index (LAI) informs management decisions and can improve efficiency of forage-livestock systems. In a long-term experiment in Florida, USA, we assessed the LI, LAI and sward height relationships of rhizoma peanut (Arachis glabrata Benth., RP)-bahiagrass (Paspalum notatum Flügge) mixed swards compared with bahiagrass monoculture to determine whether changes in canopy structure affect herbage accumulation (HA) rate due to changes in radiation use. Treatments were arranged in a semi-factorial, split-plot design (r=4). Bahiagrass monoculture and bahiagrass-RP mixtures were whole-plot treatments. Sub-plot treatments were an undefoliated …
Productive Grasslands – The Role Of Adapted Species To Increase Ecosystems Resilience, M. B. Chiavegato, A. F. Mammana, C. Y. Rodriguez
Productive Grasslands – The Role Of Adapted Species To Increase Ecosystems Resilience, M. B. Chiavegato, A. F. Mammana, C. Y. Rodriguez
IGC Proceedings (1997-2023)
Producers are interested in diversifying grazing systems with native warm-season grasses. Climate variations may result in extreme weather events. For instance, recent studies show strong evidence pointing to an increasing frequency of flooding in the central US, due to changes in both seasonal rainfall and temperature across this region. In a constantly changing climate, adapted species play a crucial role in increasing ecosystems resilience and resistance to extreme weather events. Native grasses may be well adapted to the future changes on climatic conditions, with wide ecological amplitude and resistance under different conditions. Use of adapted warm season grasses, associated with …
Effect Of Mineral Nutrition On Red Clover Leaf Area Index, B. Cupina, P. Erić, S. Vasiljević, V. Mihailovic, D. Milic
Effect Of Mineral Nutrition On Red Clover Leaf Area Index, B. Cupina, P. Erić, S. Vasiljević, V. Mihailovic, D. Milic
IGC Proceedings (1997-2023)
The legume red clover (Trifolium pratense) fixes its own nitrogen (N), but requires P and K fertilisation. There are no recent reliable data in the domestic literature, on the amounts of P and K recommended to farmers; present recommendations are often either inadequate or excessive. Red clover mineral nutrition is significantly affected by soil and weather conditions (Taylor & Quesenberry, 1996). The objective of our twoyear study was to enable rational fertiliser application in accordance with soil type and agro ecological conditions.
Growth Characteristics Of Kikuyu Grass With Different Sources And Doses Of Phosphorus, José C. Pinto, Í. P. A. Santos, A. E. Furtini Neto, A. R. Morais, E. E. Mesquita, D. J. G. Faria, I. F. Andrade
Growth Characteristics Of Kikuyu Grass With Different Sources And Doses Of Phosphorus, José C. Pinto, Í. P. A. Santos, A. E. Furtini Neto, A. R. Morais, E. E. Mesquita, D. J. G. Faria, I. F. Andrade
IGC Proceedings (1997-2023)
Growth is defined as the increase in size, volume and mass as a function of time. Growth analysis allows evaluating the final growth of the plant as a whole and the contribution of the different organs in total growth (Benincasa, 1988). The experiment had as objective to evaluate specific leaf area (SLA), leaf area per unit of leaf DM, leaf area ratio (LAR), leaf area per unit of whole plant DM, leaf weight ratio (LWR), leaf weight per unit of plant weight, leaf area index (LAI), leaf area per unit of soil area, leaf/stem ratio (LSR), leaf weight per unit …
Evolution And Ageing Of Brachiaria Brizantha Pasture Component In A Silvopastoral System, M. Rakocevic, F. C. De Oliveira, J. Ribaski, O. J. Lavoranti
Evolution And Ageing Of Brachiaria Brizantha Pasture Component In A Silvopastoral System, M. Rakocevic, F. C. De Oliveira, J. Ribaski, O. J. Lavoranti
IGC Proceedings (1997-2023)
The main causes of the decline of Brachiaria pasture in the tropics are lack of maintenance, fertilisation and excessively high animal stocking rates (Boddey et al., 2004). Brachiaria brizantha has two predominant morphological forms: 1) relatively high stems with grouped tillers at a high position constructed from short leaves (bunch type); 2) low stems with long leaves, which in time evolve into the first type (Kanno et al., 1999). The concept of Brachiaria management involves animals entering to commence grazing when the pasture is 50-60cm high and being removed at 25-30cm, leaving a regrowth period of at least …
Prediction Of Canopy Photosynthesis For Cocksfoot Pastures Grown Under Different Light Regimes, P. L. Peri, D. J. Moot, D. L. Mcneil
Prediction Of Canopy Photosynthesis For Cocksfoot Pastures Grown Under Different Light Regimes, P. L. Peri, D. J. Moot, D. L. Mcneil
IGC Proceedings (1997-2023)
Plants in field environments can experience frequent fluctuations in irradiance from full sun to shade caused by cloud cover, overstory shading (e.g. silvopastoral systems) and within canopy shading. Research with widely spaced radiata pine (Pinus radiata D. Don) has suggested that due to its shade tolerance cocksfoot (Dactylis glomerata L.) is a suitable grass for silvopastoral systems. However, there is limited explanation of the physiological basis for the responses, and consequently no predictive capacity. This limits the application of results to environments, sites and seasons outside of those in which they were measured. The objectives of this study …
Assessing Within-Field Variation In Alfalfa Leaf Area Index Using Uav Visible Vegetation Indices, Keegan Hammond, Ruth Kerry, Ryan R. Jensen, Ross Spackman, April Hulet, Bryan G. Hopkins, Matt A. Yost, Austin P. Hopkins, Neil C. Hansen
Assessing Within-Field Variation In Alfalfa Leaf Area Index Using Uav Visible Vegetation Indices, Keegan Hammond, Ruth Kerry, Ryan R. Jensen, Ross Spackman, April Hulet, Bryan G. Hopkins, Matt A. Yost, Austin P. Hopkins, Neil C. Hansen
Plants, Soils, and Climate Faculty Publications
This study examines the use of leaf area index (LAI) to inform variable-rate irrigation (VRI) for irrigated alfalfa (Medicago sativa). LAI is useful for predicting zone-specific evapotranspiration (ETc). One approach toward estimating LAI is to utilize the relationship between LAI and visible vegetation indices (VVIs) using unmanned aerial vehicle (UAV) imagery. This research has three objectives: (1) to measure and describe the within-field variation in LAI and canopy height for an irrigated alfalfa field, (2) to evaluate the relationships between the alfalfa LAI and various VVIs with and without field average canopy height, and (3) to …
Biomass And Productivity Of Thalassia Testudinum In Estuaries Of The Florida Panhandle, Laura A. Yarbro, Paul R. Carlson, Ken L. Heck, Dorothy Byron, Sandra Brooke, Linda Fitzhugh, Sheila Scolaro, Barbara Albrecht, Rachel Presley, Jane M. Caffrey
Biomass And Productivity Of Thalassia Testudinum In Estuaries Of The Florida Panhandle, Laura A. Yarbro, Paul R. Carlson, Ken L. Heck, Dorothy Byron, Sandra Brooke, Linda Fitzhugh, Sheila Scolaro, Barbara Albrecht, Rachel Presley, Jane M. Caffrey
Gulf and Caribbean Research
Thalassia testudinum often dominates seagrass meadows of the Florida panhandle but few measurements of productivity, biomass, density, turnover or leaf area index in this region have been made. We targeted 5 estuaries located at similar latitudes, 30⁰ ± 0.3⁰N: Big Lagoon, Santa Rosa Sound, St. Andrew Bay, St. Joseph Bay, and St. George Sound. This study was one component of a collaborative partnership of state and local researchers examining factors preventing recovery in panhandle estuarine areas that had historically contained seagrass in the 1940s and 1950s. Measurements were made twice in 2016, once in June and then again in summer …
Impact Of Different Plant Canopy Traits On Sorghum Yields, M. F. Lucero, A. J. P. Carcedo, L. Marziotte, L. Mayor, I. A. Ciampitti
Impact Of Different Plant Canopy Traits On Sorghum Yields, M. F. Lucero, A. J. P. Carcedo, L. Marziotte, L. Mayor, I. A. Ciampitti
Kansas Agricultural Experiment Station Research Reports
Studying changes in plant canopy can help to improve plant architecture and increase yields. Specifically, for sorghum (Sorghum bicolorL.), characterizing and identifying relevant canopy traits can be helpful not only to improve its productivity but to better fit this crop in the rotation from a system perspective. With this purpose, morphological characteristics of 20 sorghum hybrids were measured during the 2022 growing season in Wamego, KS, U.S. (United States). The most relevant canopy traits examined were leaf angle and leaf area at leaf- and at canopy-level (leaf area index, LAI), all determined at different points of the crop …
Temporal Stability Of Seagrass Extent, Leaf Area, And Carbon Storage In St. Joseph Bay, Florida: A Semi-Automated Remote Sensing Analysis, Marie Cindy Lebrasse, Blake A. Schaeffer, Megan M. Coffer, Peter J. Whitman, Richard C. Zimmerman, Victoria J. Hill, Kazi A. Islam, Jiang Li, Christopher L. Osburn
Temporal Stability Of Seagrass Extent, Leaf Area, And Carbon Storage In St. Joseph Bay, Florida: A Semi-Automated Remote Sensing Analysis, Marie Cindy Lebrasse, Blake A. Schaeffer, Megan M. Coffer, Peter J. Whitman, Richard C. Zimmerman, Victoria J. Hill, Kazi A. Islam, Jiang Li, Christopher L. Osburn
OES Faculty Publications
Seagrasses are globally recognized for their contribution to blue carbon sequestration. However, accurate quantification of their carbon storage capacity remains uncertain due, in part, to an incomplete inventory of global seagrass extent and assessment of its temporal variability. Furthermore, seagrasses are undergoing significant decline globally, which highlights the urgent need to develop change detection techniques applicable to both the scale of loss and the spatial complexity of coastal environments. This study applied a deep learning algorithm to a 30-year time series of Landsat 5 through 8 imagery to quantify seagrass extent, leaf area index (LAI), and belowground organic carbon (BGC) …
The Duration Of Regrowth Period And The Structural Traits In A Rotationally Grazed Panicum Maximum Sward, Carlos A. M. Gomide, J. A. Gomide
The Duration Of Regrowth Period And The Structural Traits In A Rotationally Grazed Panicum Maximum Sward, Carlos A. M. Gomide, J. A. Gomide
IGC Proceedings (1997-2023)
Panicum maximum 'cv'. Mombaça was rotationally grazed by steers. Three regrowth periods based on the number of expanded leaves per tiller: 2.5; 3.5 and 4.5, were compared. Three groups of seven tester steers, one for each treatment, grazed the replications of each experimental paddocks, the animals being removed from a paddock after 4 to 5 day grazing period when its sward leaf area index (LAI) was 1.5, on the average. Sward height and available biomass increased while tiller population density and leaf-stem ratio decreased with regrowth period. Overall averages observed for LAI and photosyntheticly active radiation interception by the end …
Herbage Allowance And Nitrogen Fertilization Effects On Morphological Characteristics Of Paspalum Notatum Flügge, P. Boggiano, G. E. Maraschin, Carlos Nabinger, J. Riboldi, Mónica Cadenazzi
Herbage Allowance And Nitrogen Fertilization Effects On Morphological Characteristics Of Paspalum Notatum Flügge, P. Boggiano, G. E. Maraschin, Carlos Nabinger, J. Riboldi, Mónica Cadenazzi
IGC Proceedings (1997-2023)
The grazing study was conducted at the Estação Experimental Agronomica – UFRGS, 30o S, on a native pasture, to evaluate the leaf area index and structural morphological traits of bahiagrass (Paspalum notatum Fl.), within the requirements of a Central Composite Rotatable experimental design, providing for equal precision, with two blocks, encompassing two factors at five levels each, namely: Herbage Allowance (HA) = 4.0; 5.5; 9.0; 12.5 and 14.0 kg green dry matter per 100 kg liveweight per day (% LW), in association with Nitrogen (N) fertilization levels of 0; 30; 100; 170 and 200 kg ha-1 as …
Short Term Variations In The Leaf Area Index, Tiller Density And Botanical Composition Of The Grassland In Inner Mongolia As Affected By Light To Very Heavy Grazing Intensities, H. Wan, P. Schönbach, M. Gierus, Anne Schiborra, Y. Bai, Friedhelm Taube
Short Term Variations In The Leaf Area Index, Tiller Density And Botanical Composition Of The Grassland In Inner Mongolia As Affected By Light To Very Heavy Grazing Intensities, H. Wan, P. Schönbach, M. Gierus, Anne Schiborra, Y. Bai, Friedhelm Taube
IGC Proceedings (1997-2023)
No abstract provided.
A Conceptual Model To Explain Increasing Woody Biomass In Arid And Semi‐Arid Regions, Anthony R. Palmer, D. Eamus
A Conceptual Model To Explain Increasing Woody Biomass In Arid And Semi‐Arid Regions, Anthony R. Palmer, D. Eamus
IGC Proceedings (1997-2023)
No abstract provided.
Relationship Between Field Measurements In Three Brachiaria Species With Leaf Area Index And Light Interception By Indirect Methods, Janerson J. Coêlho, Alexandre C. L. De Mello, José C. B. Dubeux Jr., Erick R. Da Silva Santos, Márcio V. Da Cunha, Mércia V. F. Dos Santos, Mario De Andrade Lira
Relationship Between Field Measurements In Three Brachiaria Species With Leaf Area Index And Light Interception By Indirect Methods, Janerson J. Coêlho, Alexandre C. L. De Mello, José C. B. Dubeux Jr., Erick R. Da Silva Santos, Márcio V. Da Cunha, Mércia V. F. Dos Santos, Mario De Andrade Lira
IGC Proceedings (1997-2023)
Brachiaria species play a strategic role in ruminant production systems in Brazil, covering an estimated pasture area of approximately 90 million hectares (Karia et al., 2006), however, these pastures are subject to different degrees of degradation due to inadequate management. In pasture management, field measurements such as canopy height, for example, are used by managers as a tool to establish parameters for the optimal point to cut the forage and for the post-grazing residue, in order to maximize production by harvesting at maximum of herbage mass accumulation, and to avoid problems associated to overgrazing, by setting ideal post-grazing height …
Assessment Of Methane Production By Goats Under Intermittent Grazing, Naomi C. Meister, Nailson L. S. Lemos, Fernando O. Alari, Victor C. Silva, William Koury Filho, Ana C. Ruggieri
Assessment Of Methane Production By Goats Under Intermittent Grazing, Naomi C. Meister, Nailson L. S. Lemos, Fernando O. Alari, Victor C. Silva, William Koury Filho, Ana C. Ruggieri
IGC Proceedings (1997-2023)
There are 875 million goats worldwide (FAO 2012) and the majority are in developing countries where they are typically raised on pasture. Ruminants release gross energy as methane, which is a greenhouse gas. Mthane mitigation strategies require prior knowledge about emission of methane by animals under different management systems. Intake, quality and type of feed are factors that influence methane emissions, therefore the objective of this study was to investigate how grazing intensity, measured by the residual leaf area index (RLAI), influences methane emission by goats under rotational grazing on Tanzania grass pasture.
Canopy Height And Its Relationship With Leaf Area Index And Light Interception Of Tropical Grasses, Janerson José Coêlho, José C. B. Dubeux Jr., Erick Rodrigo Da Silva Santos, João Manoel Carneiro Leão Neto, Márcio V. Da Cunha, Mércia V. F. Dos Santos, Alexandre C. L. De Mello, Mário De A. Lira
Canopy Height And Its Relationship With Leaf Area Index And Light Interception Of Tropical Grasses, Janerson José Coêlho, José C. B. Dubeux Jr., Erick Rodrigo Da Silva Santos, João Manoel Carneiro Leão Neto, Márcio V. Da Cunha, Mércia V. F. Dos Santos, Alexandre C. L. De Mello, Mário De A. Lira
IGC Proceedings (1997-2023)
Photosynthetic tissues, mainly green leaves, are the major component of forage growth and development. The amount of these tissues in a forage plant is influenced directly by the cutting management, which is based on cutting frequency and stubble height. It is usual to recommend as a management practice to cut (or graze) the forage whenever it reaches a given stubble height. Brougham (1956) stated that, when the forage canopy is intercepting 95% of the photosynthetic active radiation, this is the critical leaf area index (LAI), which means the forage is near its maximum growth rate without shading itself. There is …
Wheat Growth Monitoring And Yield Estimation Based On Multi-Rotor Unmanned Aerial Vehicle, Zhaopeng Fu, Jie Jang, Yang Gao, Brian Krienke, Meng Wang, Kaitai Zhong, Qiang Cao, Yongchao Tian, Yan Zhu, Weixing Cao, Xiaojun Liu
Wheat Growth Monitoring And Yield Estimation Based On Multi-Rotor Unmanned Aerial Vehicle, Zhaopeng Fu, Jie Jang, Yang Gao, Brian Krienke, Meng Wang, Kaitai Zhong, Qiang Cao, Yongchao Tian, Yan Zhu, Weixing Cao, Xiaojun Liu
Department of Agronomy and Horticulture: Faculty Publications
Leaf area index (LAI) and leaf dry matter (LDM) are important indices of crop growth. Real-time, nondestructive monitoring of crop growth is instructive for the diagnosis of crop growth and prediction of grain yield. Unmanned aerial vehicle (UAV)-based remote sensing is widely used in precision agriculture due to its unique advantages in flexibility and resolution. This study was carried out on wheat trials treated with different nitrogen levels and seeding densities in three regions of Jiangsu Province in 2018–2019. Canopy spectral images were collected by the UAV equipped with a multi-spectral camera during key wheat growth stages. To verify the …
Structural Characteristics Of Porto Rico Stargrass (Cynodon Nlemfuensis) Pastures Under Different Frequencies And Severities Of Defoliation, Carlos Augusto Brandão De Carvalho, Sergio Trabali Camargo Filho, Domingos Sávio Campos Paciullo, Pablo Giliard Zanella, Elisa Cristina Modesto, Priscila Beligoli Fernandes
Structural Characteristics Of Porto Rico Stargrass (Cynodon Nlemfuensis) Pastures Under Different Frequencies And Severities Of Defoliation, Carlos Augusto Brandão De Carvalho, Sergio Trabali Camargo Filho, Domingos Sávio Campos Paciullo, Pablo Giliard Zanella, Elisa Cristina Modesto, Priscila Beligoli Fernandes
IGC Proceedings (1997-2023)
An understanding of the effects of frequency and severity of defoliation on the sward structure of pastures is essential for identifying pasture management strategies that are more efficient in forage usage in tropical environments (Da Silva and Nascimento Jr 2007; Euclides et al. 2010). Some pasture species have not yet been investigated in this way, e.g. cultivars of Cynodon. The potential of this grass in tropical environments suggests that it should be given priority (Pedreira 2010). This study was designed to evaluate the effects of 2 frequencies (90 and 95% light interception) and severities (20 and 30 cm …
Sward Structural Characteristics Of Perennial Peanut Genotypes As Affected By Harvest Frequency, Aliedson S. Ferreira, Carlos G. S. Pedreira, Carla M. Marassatto
Sward Structural Characteristics Of Perennial Peanut Genotypes As Affected By Harvest Frequency, Aliedson S. Ferreira, Carlos G. S. Pedreira, Carla M. Marassatto
IGC Proceedings (1997-2023)
Despite the high potential of tropical forage species, herbage production, nutritive value and animal productivity in Brazilian livestock production systems are lower than what can be obtained from both a biological and operational point of view (Pedreira and Mello 2000, Da Silva and Sbrissia 2000). Even with these limitations, the livestock industry is often able to sustain high productivity levels (animal product per hectare) by using good animal genetics and supplementation. Reducing production costs, however, will likely depend on the identification and incorporation of a high-quality forage resource, in terms of both improving diet quality of grazing animals and sustaining …
Performance Of Some Forages Species (Festuca Arundinacea L., Chloris Gayana Var. Katambora, Lotus Corniculatus L. And Medicago Sativa L.) In Saline Soil, Süleyman Temel, Uğur Şimşek, Bilal Keskin, İbrahim H. Yılmaz
Performance Of Some Forages Species (Festuca Arundinacea L., Chloris Gayana Var. Katambora, Lotus Corniculatus L. And Medicago Sativa L.) In Saline Soil, Süleyman Temel, Uğur Şimşek, Bilal Keskin, İbrahim H. Yılmaz
IGC Proceedings (1997-2023)
Salinity is a soil degradation process which reduces plant diversity and agricultural productivity, decreases fertility and devalues the land in regions with arid and semi-arid climate. This process inhibits water and nutrient intake of plants from soil due to changeable nitrogen percentage and/or the intensity of soluble salt concentration. When the fact that agricultural lands are limited around the world and that the need for nutrition increases incrementally is taken into consideration, it is obvious that available lands should be used more effectively. Hence, it is quite crucial to reclaim saline soil and utilize it more economically (Woods 1996).
Contrasting Development Of Canopy Structure And Primary Production In Planted And Naturally Regenerated Red Pine Forests, Laura J. Hickey, Jeff Atkins, Robert T. Fahey, Mark R. Kreider, Shea B. Wales, Christopher M. Gough
Contrasting Development Of Canopy Structure And Primary Production In Planted And Naturally Regenerated Red Pine Forests, Laura J. Hickey, Jeff Atkins, Robert T. Fahey, Mark R. Kreider, Shea B. Wales, Christopher M. Gough
Ecology Center Publications
Globally, planted forests are rapidly replacing naturally regenerated stands but the implications for canopy structure, carbon (C) storage, and the linkages between the two are unclear. We investigated the successional dynamics, interlinkages and mechanistic relationships between wood net primary production (NPPw) and canopy structure in planted and naturally regenerated red pine (Pinus resinosa Sol. ex Aiton) stands spanning ≥ 45 years of development. We focused our canopy structural analysis on leaf area index (LAI) and a spatially integrative, terrestrial LiDAR-based complexity measure, canopy rugosity, which is positively correlated with NPPw in several naturally regenerated forests, but …
Competition And Burn Severity Determine Post-Fire Sapling Recovery In A Nationally Protected Boreal Forest Of China: An Analysis From Very High-Resolution Satellite Imagery, Lei Fang, Ellen V. Crocker, Jian Yang, Yan Yan, Yuanzheng Yang, Zhihua Liu
Competition And Burn Severity Determine Post-Fire Sapling Recovery In A Nationally Protected Boreal Forest Of China: An Analysis From Very High-Resolution Satellite Imagery, Lei Fang, Ellen V. Crocker, Jian Yang, Yan Yan, Yuanzheng Yang, Zhihua Liu
Forestry and Natural Resources Faculty Publications
Anticipating how boreal forest landscapes will change in response to changing fire regime requires disentangling the effects of various spatial controls on the recovery process of tree saplings. Spatially explicit monitoring of post-fire vegetation recovery through moderate resolution Landsat imagery is a popular technique but is filled with ambiguous information due to mixed pixel effects. On the other hand, very-high resolution (VHR) satellite imagery accurately measures crown size of tree saplings but has gained little attention and its utility for estimating leaf area index (LAI, m2/m2) and tree sapling abundance (TSA, seedlings/ha) in post-fire landscape remains …
Tree Distribution, Morphology And Modelled Air Pollution In Urban Parks, Yang Xing, Peter Brimblecombe, Sifeng Wang, Allen Hao Zhang
Tree Distribution, Morphology And Modelled Air Pollution In Urban Parks, Yang Xing, Peter Brimblecombe, Sifeng Wang, Allen Hao Zhang
Faculty of Design & Environment (THEi)
Trees offer a range of ecosystem services and remain important in providing human benefits. However, emerging literature questions the long-accepted view of trees being able to improve air quality in urban parks. The aerodynamic effect of trees was identified as a major reason for the change of pollutant distribution in near-road parks, where trees can act as porous barriers and cause localised concentration increase. Although not yet fully developed, planting strategies aiming to mitigate the negative effect of vegetation on air quality should be encouraged in future park design. In this study, we explored the effect of tree planting design …
Initial Assessment Of Canopy Fuel Factors In Forested Areas Of The Netherlands, Alan Hibler
Initial Assessment Of Canopy Fuel Factors In Forested Areas Of The Netherlands, Alan Hibler
Electronic Theses and Dissertations
The changing climate in the Netherlands has created the need to better understand how the forested communities and their structures will be affected by fire and to better estimate the impact of those fires. This study is part of a continuing collaboration between the Stephen F. Austin State University’s Arthur Temple College of Forestry and Agriculture and the Instittut Fysieke Veiligheid to assess fuel loads in the Netherlands to develop and improve models to estimate fire behavior. Data to estimate canopy bulk density for modelling canopy fire behavior were collected in the Netherlands for Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco), …
Ameliorating Ocean Acidification: Towards A Model Relating Pco2, Irradiance And Leaf Area Index Of Zostera Marina (Eelgrass) In Padilla Bay, Wa, Tyler Tran, Brooke Love, Sylvia Yang, Cinde Donoghue
Ameliorating Ocean Acidification: Towards A Model Relating Pco2, Irradiance And Leaf Area Index Of Zostera Marina (Eelgrass) In Padilla Bay, Wa, Tyler Tran, Brooke Love, Sylvia Yang, Cinde Donoghue
Salish Sea Ecosystem Conference
In nearshore, soft-sediment habitats of the Salish Sea, eelgrass (Zostera marina L.) meadows have been identified as potential mitigators of ocean acidification (OA) because their photosynthetic activity can decrease pCO2, increase pH and provide refuge for organisms sensitive to OA. The diurnal light cycle controls photosynthetic production of eelgrass and therefore, along with tidal cycles, exerts strong controls on variations in pCO2 in nearshore environment. In this study, we investigate the carbon uptake rates for eelgrass under varying light, ambient pCO2 conditions and eelgrass densities (leaf area index). The magnitude of changes predicted based on experimentally derived photosynthetic rates, measured …
Forest Stand Structure And Primary Production In Relation To Ecosystem Development, Disturbance, And Canopy Composition, Cynthia M. Scheuermann
Forest Stand Structure And Primary Production In Relation To Ecosystem Development, Disturbance, And Canopy Composition, Cynthia M. Scheuermann
Theses and Dissertations
Temperate forests are complex ecosystems that sequester carbon (C) in biomass. C storage is related to ecosystem-scale forest structure, changing over succession, disturbance, and with community composition. We quantified ecosystem biological and physical structure in two forest chronosequences varying in disturbance intensity, and three late successional functional types to examine how multiple structural expressions relate to ecosystem C cycling. We quantified C cycling as wood net primary production (NPP), ecosystem structure as Simpson’s Index, and physical structure as leaf quantity (LAI) and arrangement (rugosity), examining how wood NPP-structure relates to light distribution and use-efficiency. Relationships between structural attributes of biodiversity, …
Spectral Reflectance Indices As A Rapid And Nondestructive Phenotyping Tool For Estimating Different Morphophysiological Traits Of Contrasting Spring Wheat Germplasms Under Arid Conditions, Salah El-Hendawy, Nasser Al-Suhaibani, Abd El-Azeem Salem, Shafiq Ur Rehman, Urs Schmidhalter
Spectral Reflectance Indices As A Rapid And Nondestructive Phenotyping Tool For Estimating Different Morphophysiological Traits Of Contrasting Spring Wheat Germplasms Under Arid Conditions, Salah El-Hendawy, Nasser Al-Suhaibani, Abd El-Azeem Salem, Shafiq Ur Rehman, Urs Schmidhalter
Turkish Journal of Agriculture and Forestry
The aim of this study was to investigate whether spectral reflectance indices could be used to estimate different destructive morphophysiological traits of a wide and diverse range of spring wheat germplasm in a rapid and nondestructive manner. A total of 90 spring wheat germoplasms were evaluated under water shortage by applying only three irrigations during the growing cycle of germplasm with the amount of water totaling 2550 m3 ha-1. Ten selected spectral reflectance indices were related to the green leaf number per plant, green leaf area per plant, total dry weight per plant (TDW), grain yield per hectare (GY), leaf …
Effect Of Nitrogen Addition On The Comparative Productivity Of Corn And Velvetleaf (Abutilon Theophrasti), Darren C. Barker, Stevan Z. Knezevic, Alex R. Martin, Daniel T. Walters, John L. Lindquist
Effect Of Nitrogen Addition On The Comparative Productivity Of Corn And Velvetleaf (Abutilon Theophrasti), Darren C. Barker, Stevan Z. Knezevic, Alex R. Martin, Daniel T. Walters, John L. Lindquist
John L. Lindquist
Weeds that respond more to nitrogen fertilizer than crops may be more competitive under high nitrogen (N) conditions. Therefore, understanding the effects of nitrogen on crop and weed growth and competition is critical. Field experiments were conducted at two locations in 1999 and 2000 to determine the influence of varying levels of N addition on corn and velvetleaf height, leaf area, biomass accumulation, and yield. Nitrogen addition increased corn and velvetleaf height by a maximum of 15 and 68%, respectively. N addition increased corn and velvetleaf maximum leaf area index (LAI) by up to 51 and 90%. Corn and velvetleaf …