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Articles 2521 - 2550 of 59516

Full-Text Articles in Earth Sciences

Animal Production Of Fattening Young Steers And Beef Cows By Precursor- Follower System On Two Pasture Types, Y Takimoto, K Nishimura, H Takeda, E Tsuneishi, T Suyama, T Mitamura, S Murasato Oct 2025

Animal Production Of Fattening Young Steers And Beef Cows By Precursor- Follower System On Two Pasture Types, Y Takimoto, K Nishimura, H Takeda, E Tsuneishi, T Suyama, T Mitamura, S Murasato

IGC Proceedings (1977-2023)

Animal productions were compared on two pastures, i.e. PW pasture (perennial ryegrass-white clover dominant pasture) and PO pasture (perennial ryegrass-orchardgrass dominant pasture), through precursor-follower system using feeder steers and beef cows. The experiment was carried out in 1983 and 1984. After close of grazing feeder steers were fattened for 6 or 7 months, then the carcass characteristics were examined. Feeder steers used in the experiment 1983 were born in spring and grazed for 2 seasons. And in the experiment 1984 steers were born in spring and in fall. They grazed for 2 seasons and 1 season, respectivery. By the precursor-follower …

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Relations Between Nitrogen Fertilization, Herbage Production And Milk Yield, E A. Lantinga, L T'Mannetje, H Schlepers Oct 2025

Relations Between Nitrogen Fertilization, Herbage Production And Milk Yield, E A. Lantinga, L T'Mannetje, H Schlepers

IGC Proceedings (1977-2023)

The response to N-fertilizer of animal output and of herbage production was compared. There appeared to be no difference in the responses to applied nitrogen between intensive continuous grazing and weekly cutting in the range of 300 to 500 kg N/ha/yr. It is hypothesized that the response to applied nitrogen in a continuously grazed sward is mainly determined by the intensity of grazing and that the benefit from nitrogen circulation through excreta has little meaning for the pasture as a whole.

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Modelling Grazing Intensity Studies, David I. Bransby Oct 2025

Modelling Grazing Intensity Studies, David I. Bransby

IGC Proceedings (1977-2023)

Grazing intensity models have traditionally related animal production per head and per ha to stocking rate. The value of such models is limited by the omission of pasture information. In this paper the relationships between average daily gain, grazing days and standing herbage are used to develop models relating animal production per ha to standing herbage. These models can also be extended by relating changes in their parameters to additional quantifiable variables, or by using them in economic models to express profit per ha in terms of standing herbage.

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Coping With Grazing: A Comparison Of Two Savanna Grasses Differing In Tolerance To Defoliation, K C. Hodgkinson, J J. Mott, M M. Ludlow Oct 2025

Coping With Grazing: A Comparison Of Two Savanna Grasses Differing In Tolerance To Defoliation, K C. Hodgkinson, J J. Mott, M M. Ludlow

IGC Proceedings (1977-2023)

Heavy grazing by cattle, resulting from various practices to intensify carrying capacity, is reducing the abundance of the dominant Kangaroo grass (Themeda australis) in Australia's tropical and subtropical savannas. The objective of this study was to find whether morphological and/or physiological factors were the cause oflow tolerance of T. australis to heavy grazing. Themeda australis was compared in a glasshouse experiment, with buff el grass ( Cenchrus ciliaris), a successful introduction from Africa and known to be grazing tolerant. Half the plants were subjected to frequent close defoliation and their regrowth was compared with infrequently defoliated plants. …

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Heat Production Of Free Grazing Cattle, K Ochiai, I Tahata, F Andoh, S Shioya, T Ami Oct 2025

Heat Production Of Free Grazing Cattle, K Ochiai, I Tahata, F Andoh, S Shioya, T Ami

IGC Proceedings (1977-2023)

Heat production and herbage intake of housed and free grazing cattle were examined using trachea cannulea oxygen consumption measuring system. The daily heat production of Holstein steer and Japanese Black cow grazing on orchardgrass pasture were 212 and 167 kcal/BW0•75/day, respectively. These figures were 56% and 37% greater than those of housed cattle. The daily herbage intake of the Japanese Black cow were 64 and 77 DMg/BW°·75/day in housed and grazing, respectively. And those of the Holstein steer were 69 and 149 DM/BW°·75/day. Regarding the behaviour of cattle, the highest heat production rate was observed in grazing activity, and lowest …

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Thermoregulatory Behaviour And The Skin Temperature Of Grazing Cattle, M Sakurai, H Dohi Oct 2025

Thermoregulatory Behaviour And The Skin Temperature Of Grazing Cattle, M Sakurai, H Dohi

IGC Proceedings (1977-2023)

In order to clarify the thermoregulatory behaviour in hot and frosty environment, the skin temperature of the Japanese Black Cattle in the pasture was measured by a handy radiation thermometer. The regression equation of the temperature (X) and the skin temperature (Y) of grazing cattle was Y=0.814X+ 11.57 (regression coefficient; r=0.972), and that of the direct solar radiation (X) and the skin temperature (Y) was Y=18.05X+30.62 (r=0.824). When the skin temperature rose beyond about 40°C on sunny and hot days in summer, the cattle began to shelter in shade, where the skin temperature went down to about 35°C. When the …

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Immune Response Of Grazing Cattle To Rumen Microflora, K Ogimoto, S Sato, T Inamoto Oct 2025

Immune Response Of Grazing Cattle To Rumen Microflora, K Ogimoto, S Sato, T Inamoto

IGC Proceedings (1977-2023)

Changes in immune response to several rumen bacterial species were investigated in grazing cattle. The results revealed immune response variation in cattle from the first and second grazing seasons. Agglutination titers in sera to Streptococcus bovis and Butyrivibrio fibrisolvens increased after 30 days of grazing. Those of S. bovis remained at a higt level until grazing was competed, while titers of B. fibrisolvens were maximum after 45 days and gradually decreased. Changes in agglutinating titers to both bacterial species varied greatly in cattle of the first grazing season. Titers of Ruminococcus albus were similar to the above two species, …

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Vegetational Changes In The Sasa Nipponica Grassland Used By Winter Grazing For Successive Years, Y Ogawa, T Mitamura, K Okamoto Oct 2025

Vegetational Changes In The Sasa Nipponica Grassland Used By Winter Grazing For Successive Years, Y Ogawa, T Mitamura, K Okamoto

IGC Proceedings (1977-2023)

The influence of winter grazing by beef cattle on yearly yield and flora changes in Sasa (Sasa nipponica) grassland was examined from 1974 to 1982. This Sasa sward was established semi-naturally on cutover land following deciduous broadleaved forest at an altitude of 1,100 m on Mt. Asama in Japan. Sasa kept its foliage green and nutritive all year round, so that in this experimental grassland a large quantity of its foliage supplied sufficient nutrients for the maintenance of beef cows during winter grazing periods. Foliage weight was 2.6 tons DW/ha before winter grazing use and this value was maintained for …

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Intensive Use Of Young Japanese Cedar Forest For Grazing, K Sugawara, T Isawa, M Goto, I Ito Oct 2025

Intensive Use Of Young Japanese Cedar Forest For Grazing, K Sugawara, T Isawa, M Goto, I Ito

IGC Proceedings (1977-2023)

Experiments were conducted to investigate the intensive forest grazing in young Japanese cedar forest by introducing improved pasture species to forest floor. Study area (1-year old Japanese cedar forest) was divided into three treatment plots; unseeded and unfertilized ( unseeded plot), seeded with nitrogen (N)- phosphorus (P)-potassium (K) fertilizer ( seeded-NPK plot) and seeded with twice amount of fertilizer ( seeded-2NPK plot). Herbage production, grazing capacity, injury to the tree by grazing cattle and growth of the tree were compared among the treatments. The mean of annual fresh matter yield was 11.6 t/ha at unseeded plot, 12.7 t/ha at seeded-NPK …

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Reforestation And Cattle Grazing In Southern United States, Henry A. Pearson Oct 2025

Reforestation And Cattle Grazing In Southern United States, Henry A. Pearson

IGC Proceedings (1977-2023)

This research was undertaken to learn if cutover southern pine ranges can be sucessfully regenerated artificially with slash pine (Pinus elliottii Engelm.) while being grazed yearlong by beef cattle, Objectives were to determine the effects of various grazing intensities on the establishment and growth of slash pine and on herbage and cattle production, and the subsequent influence of pines on herbage and cattle production. Three range units comprising about 650 ha of cutover pine land were stocked to produce light, moderate, and heavy grazing intensities. Each year during a 4-year regeneration cycle, 17 percent of each range unit was …

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Improvement Of Forest Grazing On Sado Island, H Hirota, T Suzuki Oct 2025

Improvement Of Forest Grazing On Sado Island, H Hirota, T Suzuki

IGC Proceedings (1977-2023)

The develpoment of forest grazing in Sada Island is briefly outlined and the cause of the abrupt decline of Zoysia dominant vegetation during the last few decades is discussed. Some experimental results to improve the herbage production for forest grazing on the island are described. For example the invading bush trees should be controlled by either felling them down or applying herbicides, followed by vegetative propagation of Zoysia species and fertilizer application. Gentle slopeland can be renovated by oversowing cool temperate grass species; 15 Kg Dactylis glomerata, 10 Kg Lolium perenne, 5 Kg Paa pratensis and 5 Kg …

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Grazing As A Part Of Agroforestry, Harold F. Heady Oct 2025

Grazing As A Part Of Agroforestry, Harold F. Heady

IGC Proceedings (1977-2023)

Multiple use of land by the small landholder for food crops, trees and animals, often called agroforestry, holds great promise for aiding people near poverty in developing countries, but new forages and techniques of management must be developed.

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Forest Grazing In Taiwan, M D. Huang, K J. Chen, Y J. Wu, J C. Yang Oct 2025

Forest Grazing In Taiwan, M D. Huang, K J. Chen, Y J. Wu, J C. Yang

IGC Proceedings (1977-2023)

Due to the shortage of man-power in rural regions, forest grazing was tested as an alternative to eliminate the noxious plants dispersed on the timber plantations in Taiwan. Tree growth was not affected, when Hereford heifers were introduced to 4-year-old Taiwania cryptomerioides plantations(at 1,600 m altitude). Although indigenous water buffaloes were less tolerant to heat than the European cattle( Hereford and Holstein), they were able to show moderate body weight gain in the tough forest environment. Partial blood profiles obtained from buffaloes and cattle gave the same conclusion.

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Effects Of Spring Mangement On Herbage Mass And Sward Characteristics In Ryegrass White Clover Pasture, B M. Butler, A.C P. Chu, P.N P. Mathews, C J. Korte Oct 2025

Effects Of Spring Mangement On Herbage Mass And Sward Characteristics In Ryegrass White Clover Pasture, B M. Butler, A.C P. Chu, P.N P. Mathews, C J. Korte

IGC Proceedings (1977-2023)

The effects of grazing intensity and frequency were investigated on a ryegrass/white clover pasture. Large differences in herbage mass between treatments arose mostly from ryegrass reproductive stubble during spring and mid-summer and from dead reproductive stubble during mid-summer and early autumn. Leafy, vegetative pastures were achieved during the reproductive growth period by maintaining a sward residual of less than 500 kg leaf DM/ha (sward height 9 cm) and a grazing interval of less than 14 days (pre-grazing height 20 cm). The evidence suggests that reducing the mass or size of individual reproductive tillers can be equally effective as that of …

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Biotechnology In The Improvement Of Forage Crops, Indra K. Vasil Oct 2025

Biotechnology In The Improvement Of Forage Crops, Indra K. Vasil

IGC Proceedings (1977-2023)

Major advances in the cellular and molecular biology of plants recently have created new opportunities for the application of the many novel methods of biotechnology to the genetic modification and improvement of crop plants. The techniques of plant cell culture, particularly those allowing the regeneration of plants from single cells, play an important and integral role in the various strategies currently being pursued for plant improvement by unconventional means. In the past, initiation and maintenance of, as well as plant regeneration from, tissue cultures of species of the Gramineae (Poaceae) proved to be difficult. Nevertheless, cultures capable of plant regeneration …

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Present State Of Grassland Production And Utilization And Future Perspectives For Grassland Farming In Humid Tropical Asia, I M. Nitis Oct 2025

Present State Of Grassland Production And Utilization And Future Perspectives For Grassland Farming In Humid Tropical Asia, I M. Nitis

IGC Proceedings (1977-2023)

Forage in humid tropical Asia consists of natural pasture, crop residues, shrub and tree leaves. Reserch has shown that the yield and quality of such forage can be increased and performance of the livestock utilizing such forage can be improved. Grassland farming contributes to the feed supply for livestock, to conservation, and is one component of an integration, which may increase economic returns and maintain the ecological balance of the region. Future research emphases on companion cropping, three strata forage, development of tidal flooding areas, agroforestry, carbon/nitrogen cyling, pasture persistency, seed production, post harvest, forage utilization and farming modelling are …

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Grassland Resources And Future Development Of Grassland Farming In Temperate China, Zhu Tingcheng, Li Jiandong, Zu Yuangang Oct 2025

Grassland Resources And Future Development Of Grassland Farming In Temperate China, Zhu Tingcheng, Li Jiandong, Zu Yuangang

IGC Proceedings (1977-2023)

In the first part of the paper the grassland resources in the semiarid area of China are descrived. Grasslands cover 2.86 million km2 of the total territory and 100 million livestock are being raised there. Steppes and meadows are classified into several types according to the ecological types of the dominant species and environments, etc. Area, geographical distribution, community structure, species composition, dynamics, nutritive value of herbages, primary production and utilization of each grassland type are outlined. In the second part, the necessity to promote grassland farming and the possibility of its development are discussed based upon the land, population, …

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An Interdisciplinary Approach For Increasing Yield And Improving Quality Of Forages, J R. Wilson Oct 2025

An Interdisciplinary Approach For Increasing Yield And Improving Quality Of Forages, J R. Wilson

IGC Proceedings (1977-2023)

The contribution of some basic plant disciplines, principally physiology and histology, to the improvement of pasture yield and quality is discussed. Studies of temperate pasture grasses have identified several sources of loss of potential yield and have provided selection criteria for increasing yield. Integration of this physiological research with studies of forage consumption on the same pastures is proving a valuable inter- disciplinary approach to defining management options for maximising pasture and/or animal productivity. In tropical grasses, research towards increasing total dry matter yield is perhaps unwarranted but there is need for more co-operative studies involving plant and animal scientists …

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Contribution Of Grassland Science To The Development Of Forage Production And Future Perspectives For Grassland Farming In Japan, H Oizumi Oct 2025

Contribution Of Grassland Science To The Development Of Forage Production And Future Perspectives For Grassland Farming In Japan, H Oizumi

IGC Proceedings (1977-2023)

The utilization of grassland in Japan dates to fairy old times, but its real improvement in terms of industry did not start until the termination of the World War II. As the climatic conditions in Japan differ very much from those of European coutries, the style of grassland farming in Japan is somewhat different from that of Europe. The improvement of grassland farming in Japan after the World War II was divided into four stages, according to the tendency of the number of cattle and the acreage of forage crops. The Japanese Society of Grassland Science was established in 1954. …

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Prospects For Increasing Symbiotic Nitrogen Fixation In Temperate Grasslands, P/ Roger Ball, J R. Crush Oct 2025

Prospects For Increasing Symbiotic Nitrogen Fixation In Temperate Grasslands, P/ Roger Ball, J R. Crush

IGC Proceedings (1977-2023)

The contribution of some basic plant disciplines, principally physiology and histology, to the improvement of pasture yield and quality is discussed. Studies of temperate pasture grasses have identified several sources of loss of potential yield and have provided selection criteria for increasing yield. Integration of this physiological research with studies of forage consumption on the same pastures is proving a valuable inter- disciplinary approach to defining management options for maximising pasture and/or animal productivity. In tropical grasses, research towards increasing total dry matter yield is perhaps unwarranted but there is need for more co-operative studies involving plant and animal scientists …

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Turning Waste Into Fertilizer: Aloe Vera Leaf Shavings Improve Plant Growth And Support Soil Fertility In Organic Systems, Isaiah Edward Jaramillo, Carine Cocco, James Jihoon Kang, Chu-Lin Cheng, Engil Pereira Oct 2025

Turning Waste Into Fertilizer: Aloe Vera Leaf Shavings Improve Plant Growth And Support Soil Fertility In Organic Systems, Isaiah Edward Jaramillo, Carine Cocco, James Jihoon Kang, Chu-Lin Cheng, Engil Pereira

School of Earth, Environmental, & Marine Sciences Faculty Publications

The Aloe vera industry discards large amounts of outer leaf tissue (“shavings”), creating an opportunity to repurpose this byproduct as a sustainable fertilizer. This study evaluated whether aloe shavings can serve as a plant-based alternative to compost in organic Aloe vera production. A field trial in the Lower Rio Grande Valley of Texas tested three treatments: aloe shavings (applied to supply 39 kg N ha−1), organic compost (39 kg N ha−1), and a non-fertilized control. Laboratory incubations further assessed nitrogen mineralization and microbial respiration. Aloe shavings significantly enhanced vegetative growth: leaf number increased from 5.7 to 12.3 leaves per plant …

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Microclimatic Conditions In Shulgan-Tash Cave (Southern Ural, Russia): Implications For The Preservation Of Eastern Europe’S Largest Paleolithic Art Collection, Olga Chervyatsova, Rayan Akhmedyanovb, Nailya Saifullina, Ludmila Kuzmina, Mihael Kotov, Yuri Dublyansky Oct 2025

Microclimatic Conditions In Shulgan-Tash Cave (Southern Ural, Russia): Implications For The Preservation Of Eastern Europe’S Largest Paleolithic Art Collection, Olga Chervyatsova, Rayan Akhmedyanovb, Nailya Saifullina, Ludmila Kuzmina, Mihael Kotov, Yuri Dublyansky

International Journal of Speleology

This study presents the results of a long-term investigation of the microclimatic conditions in Shulgan-Tash Cave (Southern Urals, Russia), which hosts the largest assemblage of Upper Paleolithic paintings (ca. 16.3–19.6 ka) in Eastern Europe. The cave exhibits two distinct seasonal ventilation regimes – winter and summer – differentially influence its two levels of galleries. In the Lower Level, which contains 83% of the images, near-atmospheric CO2 concentrations persist year-round, and temperature variations associated with seasonal infiltration events are minimal (1.0–1.3°C). By contrast, the Upper Level, including the decorated Hall of Paintings, is affected by downdrafts of CO2-rich …

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Factors Influencing Plant Community Structure And Composition Of Restored Tamaulipan Thornscrub Forests, Jerald T. Garrett, Audrey J. Hicks, Christopher A. Gabler Oct 2025

Factors Influencing Plant Community Structure And Composition Of Restored Tamaulipan Thornscrub Forests, Jerald T. Garrett, Audrey J. Hicks, Christopher A. Gabler

School of Earth, Environmental, & Marine Sciences Faculty Publications

The Lower Rio Grande Valley (LRGV) of Texas is a biodiversity hotspot due to its high alpha, beta, and gamma diversity and high regional endemism, which are at high risk of degradation. The region has lost 95% of its native thornforest habitat primarily due to agricultural and urban expansion. This study aims to evaluate the current vegetative structure and composition of restored thornforest sites located in the LRGV to identify restoration methods and site characteristics that affect forest restoration outcomes. Twelve restored thornforest sites were selected for this study that varied in time since restoration, patch size, degree of isolation, …

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Chemical Analyses Of Soil Samples, Johan Du Toit, Shantell Garrett Oct 2025

Chemical Analyses Of Soil Samples, Johan Du Toit, Shantell Garrett

Browse all Datasets

Results of chemical analyses of soil collected in the foothills of the Henry Mountains, south-central Utah, in the fall of 2020.

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Extremely Poleward Shift Of Antarctic Circumpolar Current By Eccentricity During The Last Interglacial, Lijuan Lu, Xufeng Zheng, Michael E. Weber, Victoria Peck, Brendan T. Reilly, Zhong Chen, Wen Yan, Tianyu Chen, Hong Yan, Xun Gong, Shuzhuang Wu, Liwei Zheng, Shiming Wan, Yan Du, Lisa Tauxe, Qinghua Yang, Stefanie Brachfeld, Trevor Williams, Yasmina M. Martos, Zhiheng Du, Marga García, Lara F. Pérez, Hu Yang, Bingyue Huang, Jonathan Warnock, Shuh-Ji Kao Oct 2025

Extremely Poleward Shift Of Antarctic Circumpolar Current By Eccentricity During The Last Interglacial, Lijuan Lu, Xufeng Zheng, Michael E. Weber, Victoria Peck, Brendan T. Reilly, Zhong Chen, Wen Yan, Tianyu Chen, Hong Yan, Xun Gong, Shuzhuang Wu, Liwei Zheng, Shiming Wan, Yan Du, Lisa Tauxe, Qinghua Yang, Stefanie Brachfeld, Trevor Williams, Yasmina M. Martos, Zhiheng Du, Marga García, Lara F. Pérez, Hu Yang, Bingyue Huang, Jonathan Warnock, Shuh-Ji Kao

Department of Earth and Environmental Studies Faculty Scholarship and Creative Works

The Antarctic Circumpolar Current (ACC) exerts substantial control on the physical, chemical, and biological properties of the Southern Ocean, playing a key role in modulating the global carbon cycle and climate. However, the orbital-scale forcing and future changes in the strength and position of the ACC remain elusive. Here, we reconstruct the history of ACC extending back to the Last Interglacial (LIG; 128-113 ka) using sediment cores from the Scotia Sea. Based on high-resolution measurements of sortable silt mean grain size, we find that bottom current speed is synchronized with eccentricity, superimposed by precession. During the LIG when both eccentricity …

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Tillage Legacy, Grasses And Soil Texture Shape Soil Organic Carbon Recovery In Semi-Arid Woodland, Samantha Colunga, Alejandro Fierro-Cabo, Bradley O. Christoffersen, Engil Pereira Oct 2025

Tillage Legacy, Grasses And Soil Texture Shape Soil Organic Carbon Recovery In Semi-Arid Woodland, Samantha Colunga, Alejandro Fierro-Cabo, Bradley O. Christoffersen, Engil Pereira

School of Earth, Environmental, & Marine Sciences Faculty Publications

Soil degradation from intensive tillage poses a critical barrier to carbon sequestration, particularly in semi-arid regions where low rainfall limits ecosystem recovery. As climate change expands arid zones globally, understanding the long-term potential for soil organic carbon (SOC) recovery in degraded lands becomes increasingly urgent. Here, we analyze reforested chronosequences (4–36 years post-abandonment) in formerly cultivated subtropical thornscrub woodlands to assess SOC dynamics across gradients of soil texture and degradation. We introduce a novel degradation index (DI), integrating SOC deficit and grass dominance, to evaluate how invasive grasses, commonly overlooked in restoration metrics, impede nitrogen (N2)-fixing tree establishment and, consequently, …

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The Taxonomy And Origins Of Folia: A Brief Review, Donald G. Davis, Louise D. Hose, Harvey R. Duchene Oct 2025

The Taxonomy And Origins Of Folia: A Brief Review, Donald G. Davis, Louise D. Hose, Harvey R. Duchene

International Journal of Speleology

All folia demonstrate a few common elements: folia (singular, folium) are planar or sub-planar speleothems, slanting downward and away from cave walls and ceilings, and genetically associated with fluctuating environmental interfaces. They were first identified and named from examples in western USA hypogenic caves but have since been identified elsewhere in the world. Folia shelves are typically composed of calcite and interweave smoothly along sub-horizontal contours. Calcite accretion, both chemical and mechanical from suspended particles, follows water-surface fluctuations to form protrusions in arrays along walls and ceilings where new accretion tends to follow the water-surface downward during descending phases, gradually …

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Vulnerability Of Blue Carbon In Coastal Freshwater Ecosystems To Sea-Level Rise, Suvrajit Ghosh, Jonathan Obrist-Farner, Jeffery R. Stone, Marta Wojewodka-Przybyt, Ryan Smith, Mark Brenner, Jason H. Curtis, Susan R. H. Zimmerman, Alex Correa-Metrio, Paula Gabriela Echeverrio Galinda, Madeline J. Brosky, Liseth Perez Oct 2025

Vulnerability Of Blue Carbon In Coastal Freshwater Ecosystems To Sea-Level Rise, Suvrajit Ghosh, Jonathan Obrist-Farner, Jeffery R. Stone, Marta Wojewodka-Przybyt, Ryan Smith, Mark Brenner, Jason H. Curtis, Susan R. H. Zimmerman, Alex Correa-Metrio, Paula Gabriela Echeverrio Galinda, Madeline J. Brosky, Liseth Perez

Geosciences and Geological and Petroleum Engineering Faculty Research & Creative Works

Coastal freshwater ecosystems are economically and ecologically important and provide multiple environmental services worldwide. They sequester carbon at rates ten times faster, and store five times more carbon per unit area than do mature tropical forests. Vulnerability of these carbon sinks to marine inundation, however, is expected to increase in response to global sea-level rise (GSLR). To better understand the implications of future GSLR, we investigated the geochemical and biological consequences of episodic Holocene marine incursions into Lake Izabal, a large coastal freshwater ecosystem on the Caribbean coast of Central America. About 8300 cal yr BP, marine incursion transformed Lake …

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Integrating Satellite Observations And Modeling Approaches To Study Tectonic And Land Surface Hazards, Jeng Hann Chong Oct 2025

Integrating Satellite Observations And Modeling Approaches To Study Tectonic And Land Surface Hazards, Jeng Hann Chong

Earth and Planetary Sciences ETDs

The increasing availability of Earth observation satellites, such as SAR and optical platforms, has improved our ability to study the ground deformation processes during, after, and leading up to these natural hazards, such as earthquakes and debris flows. In this dissertation, I analyze satellite geodetic interseismic velocities across the Rakhine-Bangladesh megathrust and the influence of having realistic modeling assumptions for subduction zones to better constrain seismic hazard. I also examined changes in post-fire debris flow likelihood four years after the 2020 Lake Fire in Southern California using a suite of satellite data and field observations. Together, these studies highlight how …

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A Better Great Plains: Bridging The Implementation Gap For A Better Future, David W. Sandahl Oct 2025

A Better Great Plains: Bridging The Implementation Gap For A Better Future, David W. Sandahl

School of Natural Resources: Dissertations, Theses, and Student Research

The Northern Great Plains is experiencing extensive native grassland loss and landscape degradation, jeopardizing both ecological integrity and the socio-economic systems that rely upon these ecosystems. In an early effort to lessen degradation, the United States Department of Agriculture (USDA) introduced the Conservation Reserve Program (CRP) which generated ecosystem services benefits such as reduced soil erosion, improved water quality, and increased species diversity through the retirement of cropland and rangeland for 10- or 15-year contracts. However, CRP has not fully modernized alongside today’s agriculturalists and adoption remains shaped by an historically fraught socio-political context characterized by deep-seated mistrust between ranchers, …

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