Open Access. Powered by Scholars. Published by Universities.®

Forest Sciences Commons

Open Access. Powered by Scholars. Published by Universities.®

5346 Full-Text Articles 7129 Authors 656808 Downloads 120 Institutions

All Articles in Forest Sciences

Faceted Search

5346 full-text articles. Page 1 of 108.

Projecting Iowa's Outdoor-Recreation Needs To 1980, Glenn H. Manning, Henry H. Webster, Frederick S. Hopkins Jr., Roy D. Hickman 2017 Canadian Forestry Service

Projecting Iowa's Outdoor-Recreation Needs To 1980, Glenn H. Manning, Henry H. Webster, Frederick S. Hopkins Jr., Roy D. Hickman

Research Bulletin (Iowa Agriculture and Home Economics Experiment Station)

Participation in a wide range of outdoor-recreation activities has increased rapidly in Iowa, as elsewhere in the United States, over the last three decades. Substantial evidence supports anticipation of continued increase in such activity for several decades.

Planning for the effective use of available resources to meet rising demand for outdoor recreation requires sound information of several kinds. Data available as a basis for outdoor-recreation planning in Iowa has been limited in both quantity and quality. This study was conducted to provide one kind of information useful for planning purposes. On the basis of a survey of Iowa residents, estimates ...


Using The Storm Water Management Model To Predict Urban Headwater Stream Hydrological Response To Climate And Land Cover Change, J. Y. Wu, Janette R. Thompson, R. K. Kolka, Kristie J. Franz, Timothy W. Stewart 2017 Iowa State University

Using The Storm Water Management Model To Predict Urban Headwater Stream Hydrological Response To Climate And Land Cover Change, J. Y. Wu, Janette R. Thompson, R. K. Kolka, Kristie J. Franz, Timothy W. Stewart

Timothy W. Stewart

Streams are natural features in urban landscapes that can provide ecosystem services for urban residents. However, urban streams are under increasing pressure caused by multiple anthropogenic impacts, including increases in human population and associated impervious surface area, and accelerated climate change. The ability to anticipate these changes and better understand their effects on streams is important for developing and implementing strategies to mitigate potentially negative effects. In this study, stream flow was monitored during April-November (2011 and 2012), and the data were used to apply the Storm Water Management Model (SWMM) for five urban watersheds in central Iowa, USA, representing ...


Riparian Buffer Systems -- The Basics, Thomas M. Isenhart, Michael J. Tidman 2017 Iowa State University

Riparian Buffer Systems -- The Basics, Thomas M. Isenhart, Michael J. Tidman

Thomas M. Isenhart

If you have a stream running through your farm, you may be interested in learning about a conservation technique that has gained the respect of many Iowa landowners and conservation professionals. It is called a riparian buffer system and involves planting trees, shrubs, and native grasses along streams to prevent sediment and chemicals from entering creeks and rivers.


Get Acquainted With The Iowa Crep, Thomas M. Isenhart, Michael J. Tidman 2017 Iowa State University

Get Acquainted With The Iowa Crep, Thomas M. Isenhart, Michael J. Tidman

Thomas M. Isenhart

The Conservation Reserve Enhancement Program (CREP), an offshoot of the original Conservation Reserve Program (CRP), is a voluntary program for agricultural landowners. Unique state and federal partnerships allow producers to receive incentive payments for installing specific conservation practices. Through CREP, farmers with eligible land receive annual rental payments and cost-share assistance to establish long-term, resource-conserving cover.


Riparian Buffers For Agricultural Land, Michael dosskey, Richard C. Schultz, Thomas M. Isenhart 2017 University of Nebraska - Lincoln

Riparian Buffers For Agricultural Land, Michael Dosskey, Richard C. Schultz, Thomas M. Isenhart

Thomas M. Isenhart

Purpose: • Define what a riparian buffer is • Describe what benefits a riparian buffer can provide in an agricultural landscape • Identify situations where installing a riparian buffer should be considered


Buffers And Vegetative Filter Strips, Matthew J. Helmers, Thomas M. Isenhart, Mike Dosskey, Seth M. Dabney, Jeffrey S. Strock 2017 Iowa State University

Buffers And Vegetative Filter Strips, Matthew J. Helmers, Thomas M. Isenhart, Mike Dosskey, Seth M. Dabney, Jeffrey S. Strock

Thomas M. Isenhart

This chapter describes the use of buffers and vegetative filter strips relative to water quality. In particular, we primarily discuss the herbaceous components of the following NRCS Conservation Practice Standards:
Filter Strip (393)
Alley Cropping (311)
Riparian Forest Buffer (391)
Vegetative Barrier (601)
Conservation Cover (327)
Riparian Herbaceous Cover (390)
Contour Buffer Strips (332)
Grassed Waterway (412)

Placement of most of these practices is illustrated in figure 4-1. Common purposes of these herbaceous components (as defined by the NRCS Conservation Practice Standards) are to:
• Reduce the sediment, particulate organics, and sediment-adsorbed contaminant loadings in runoff.
• Reduce dissolved contaminant loadings in ...


Relationship Of Tree Survival And Yield To Coal-Spoil Characteristics, P. L. Lorio Jr., G. E. Gatherum 2017 U.S.D.A.

Relationship Of Tree Survival And Yield To Coal-Spoil Characteristics, P. L. Lorio Jr., G. E. Gatherum

Research Bulletin (Iowa Agriculture and Home Economics Experiment Station)

A study was made of the relationships between 7· to 8.year survival and yield of two broadleaved and five coniferous species and a number of selected chemical characteristics of Iowa coal.spoil materials.

The objectives were: (1) to determine if survival and yield of these tree species are related to the chemical characteristics of the spoils, (2) to identify those spoil chemicals most closely related to survival and yield of each of the tree species tested and (3) to provide this information to permit formulation of hypotheses for future controlled experiments.


Spatial Variation In Carbon And Nitrogen In Cultivated Soils In Henan Province, China: Potential Effect On Crop Yield, Xuelin Zhang, Qun Wang, Frank S. Gilliam, Yilun Wang, Feina Cha, Chaohai Li 2017 Marshall University

Spatial Variation In Carbon And Nitrogen In Cultivated Soils In Henan Province, China: Potential Effect On Crop Yield, Xuelin Zhang, Qun Wang, Frank S. Gilliam, Yilun Wang, Feina Cha, Chaohai Li

Qun Wang

Improved management of soil carbon (C) and nitrogen (N) storage in agro-ecosystems represents an important strategy for ensuring food security and sustainable agricultural development in China. Accurate estimates of the distribution of soil C and N stores and their relationship to crop yield are crucial to developing appropriate cropland management policies. The current study examined the spatial variation of soil organic C (SOC), total soil N (TSN), and associated variables in the surface layer (0–40 cm) of soils from intensive agricultural systems in 19 counties within Henan Province, China, and compared these patterns with crop yield. Mean soil C ...


In Situ Nitrogen Mineralization, Nitrification, And Ammonia Volatilization In Maize Field Fertilized With Urea In Huanghuaihai Region Of Northern China, Xuelin Zhang, Qun Wang, Jun Xu, Frank S. Gilliam, Nicolas Tremblay, Chaohai Li 2017 Marshall University

In Situ Nitrogen Mineralization, Nitrification, And Ammonia Volatilization In Maize Field Fertilized With Urea In Huanghuaihai Region Of Northern China, Xuelin Zhang, Qun Wang, Jun Xu, Frank S. Gilliam, Nicolas Tremblay, Chaohai Li

Qun Wang

Nitrogen (N) fertilization potentially affects soil N mineralization and leaching, and can enhance NH3 volatilization, thus impacting crop production. A fertilizer experiment with five levels of N addition (0, 79, 147, 215 and 375 kg N ha-1) was performed in 2009 and 2010 in a maize field in Huanghuaihai region, China, where > 300 kg N ha-1 has been routinely applied to soil during maize growth period of 120 days. Responses of net N mineralization, inorganic N flux (0–10cm), NH3 volatilization, and maize yield to N fertilization were measured. During the growth period, net N mineralization and nitrification varied seasonally ...


Effects Of Light And Soil Moisture On Forest Tree Seedling Establishment, G. E. Gatherum, A. L. McComb, W. E. Loomis 2017 Iowa State University of Science & Technology

Effects Of Light And Soil Moisture On Forest Tree Seedling Establishment, G. E. Gatherum, A. L. Mccomb, W. E. Loomis

Research Bulletin (Iowa Agriculture and Home Economics Experiment Station)

The present studies were designed to aid in the solution of forest tree seedling establishment problems common to stand conversion practices in Iowa. The primary objectives were: (1) to determine the minimum treatment needed to insure successful survival and growth; (2) to study the relationships of light and soil moisture in plant competition resulting from stand conversion; and (3) to evaluate five species of conifers - European larch, Scotch pine, eastern white pine, Norway spruce and red pine - for adaptability to region, site and underplanting.

Field studies were made at the Brayton Forest in northeastern Iowa and consisted of ( 1 ) practical ...


Effects Of Grass Competition Upon The Establishment Of Hardwood Plantations In Iowa, R. D. Lane, A. L. McComb 2017 U. S. Forest Service, Illinois Branch

Effects Of Grass Competition Upon The Establishment Of Hardwood Plantations In Iowa, R. D. Lane, A. L. Mccomb

Research Bulletin (Iowa Agriculture and Home Economics Experiment Station)

Third-year results are reported for a test of the effects of removing sod competition, mulching with sod, and root pruning on the survival and growth of black locust, green ash and American elm seedlings planted in both medium and heavy sod covers. Four sizes of sod scalps, 6 (check), 12. 24 and 48 inches in diameter were used. Half of all the plots were mulched with inverted sod, and root-pruned seedlings were used on half of the plots. Two supplementary studies. designed to help explain some of the results of the planting study, also are reported. One of these tested ...


Some Fertilizer Experiments With Deciduous Forest Tree Seedlings On Several Iowa Soils, A. L. McComb 2017 Iowa State College

Some Fertilizer Experiments With Deciduous Forest Tree Seedlings On Several Iowa Soils, A. L. Mccomb

Research Bulletin (Iowa Agriculture and Home Economics Experiment Station)

The growth of seedling green ash, American elm, red oak and black locust was studied in relation to nitrogen, phosphorus and potassium fertilization of four Iowa soils. Fertilizers were added to Band C horizon soil materials and growth compared with that obtained on unfertilized surface and sub-soils. The soils employed were the gray-brown podzolic forest Lindley and prairie Clarion, Tama and O'Neill. Factors causing chlorosis on calcareous Clarion C horizon soil were also investigated.

Nitrogen was found deficient for growth of ash, elm and oak. Black locust, a legume, did not respond to nitrogen fertilization. As the residual soil ...


Defects Which Reduce Quality And Yield Of Oak-Hickory Stands In Southeastern Iowa, Charles M. Genaux, John G. Kuenzel 2017 Iowa State College

Defects Which Reduce Quality And Yield Of Oak-Hickory Stands In Southeastern Iowa, Charles M. Genaux, John G. Kuenzel

Research Bulletin (Iowa Agriculture and Home Economics Experiment Station)

Data from 753 sample trees, representative of conditions commonly encountered in forests of southeastern Iowa indicate that:

1. Volume loss from all types of defects averaged 8.5 percent of the total volume of trees in the merchantable size class, 5.2 percent of the total volume of large poles and 6.2 percent of the total volume of saplings.

2. In white oak, the most important species represented, the percentage of defective volume decreased with increasing diameter.

3. Slightly over 60 percent of the trees were partially defective from one or more causes.

4. In three out of every ...


A Tree Species Effect On Soil That Is Consistent Across The Species’ Range: The Case Of Aspen And Soil Carbon In North America, Jerome Laganiere, Antra Boca, Helga Van Miegroet, David Paré 2017 Canadian Forest Service

A Tree Species Effect On Soil That Is Consistent Across The Species’ Range: The Case Of Aspen And Soil Carbon In North America, Jerome Laganiere, Antra Boca, Helga Van Miegroet, David Paré

Helga Van Miegroet

Trembling aspen covers a large geographic range in North America, and previous studies reported that a better understanding of its singular influence on soil properties and processes is of high relevance for global change questions. Here we investigate the potential impact of a shift in aspen abundance on soil carbon sequestration and soil carbon stability at the continental scale by conducting a systematic literature review using 23 published studies. Our review shows that aspen’s effect on soil carbon is relatively consistent throughout the species range. Aspen stores less C in the forest floor but similar amounts in the mineral ...


Can Carbon Fluxes Explain Differences In Soil Organic Carbon Storage Under Aspen And Conifer Forest Overstories?, Antra Boca, Helga Van Miegroet 2017 Utah State University

Can Carbon Fluxes Explain Differences In Soil Organic Carbon Storage Under Aspen And Conifer Forest Overstories?, Antra Boca, Helga Van Miegroet

Helga Van Miegroet

Climate- and management-induced changes in tree species distributions are raising questions regarding tree species-specific effects on soil organic carbon (SOC) storage and stability. Quaking aspen (Populus tremuloides Michx.) is the most widespread tree species in North America, but fire exclusion often promotes the succession to conifer dominated forests. Aspen in the Western US have been found to store more SOC in the mineral soil than nearby conifers, but we do not yet fully understand the source of this differential SOC accumulation. We measured total SOC storage (0–50 cm), characterized stable and labile SOC pools, and quantified above- and belowground ...


Effect Of Spatial Influence On Endophyte Diversity Within Alnus Rubra, Sebastian L. Singleton 2017 Portland State University

Effect Of Spatial Influence On Endophyte Diversity Within Alnus Rubra, Sebastian L. Singleton

Student Research Symposium

Red alders (Alnus rubra) of the Pacific Northwest are characterized as actinorhizal dicotyledons; plants that possess that ability to form symbiotic relationships with endophytic organisms, which result in nitrogen-fixing nodules. In Alders of the order Fagales, such a symbiotic relationship with Frankia bacteria allows these plants to play crucial environmental roles as pioneer species able to colonize and enrich nutrient-deficient soils. This ability has a major impact on ecological succession by enabling other species to establish. Although inoculation with frankia bacteria is known to increase symbiotic nitrogen fixation capabilities of actinorhizal plants, whether they could confer the same benefit to ...


Critical Habitat Assessment Of The State Threatened Broad-Headed Skink, Allison Hullinger 2017 Fort Hays State University

Critical Habitat Assessment Of The State Threatened Broad-Headed Skink, Allison Hullinger

John Heinrichs Scholarly and Creative Activities Day

The Broad-Headed Skink is a semi-arboreal species that inhabits deciduous forests of the southeastern United States. Eastern Kansas makes up the northwestern periphery of their range and thus serves as an important area for studying the conservation of the species. In order to better evaluate the conservation status of the Broad-Headed Skink and develop a Recovery Plan, critical habitat needs to be better defined. In 2016, we surveyed 117 sites at Marais des Cygnes Wildlife Area, Marais des Cygnes National Wildlife Refuge, and La Cygne Wildlife Area. We installed drift fences, performed visual encounter surveys, and conducted a habitat evaluation ...


Variation In Density Dependent Seedling Survival Across Forests Of Different Successional Age And Hunting Protection Status, Nohemi Huanca-Nunez 2017 University of Nebraska-Lincoln

Variation In Density Dependent Seedling Survival Across Forests Of Different Successional Age And Hunting Protection Status, Nohemi Huanca-Nunez

Dissertations and Theses in Biological Sciences

Over 50% of the original extent of tropical forests has been cleared. Restoration of secondary forests is important for maintaining the ecosystem services that mature tropical forests provide. Density dependence (DD) is thought to be a major mechanism for shaping forest community structure and may cause reduced spatial aggregation among individuals of the same species, allowing for maintenance of diversity. While much research has focused on DD in mature tropical forests, few studies have examined how DD may influence community structure in secondary forests, many of which are also exposed to hunting. There are several important agents of negative and ...


Flight Activity, Oviposition Pit Distribution, And Emergence Densities Of Monochamus Titillator And M. Carolinensis In The Ozark-St. Francis National Forest In Arkansas, Jake Bodart 2017 University of Arkansas, Fayetteville

Flight Activity, Oviposition Pit Distribution, And Emergence Densities Of Monochamus Titillator And M. Carolinensis In The Ozark-St. Francis National Forest In Arkansas, Jake Bodart

Theses and Dissertations

Monochamus (Coleoptera: Cerambycidae) are a genus of longhorn beetles commonly known as pine sawyers. They have a worldwide distribution coincident with pines (Pinaceae) and are vectors of the pinewood nematode (Bursaphelenchus xylophilus). In the United States, there are eight known Monochamus species and they have a sympatric distribution with at least one other Monochamus species throughout their range. Monochamus are known to attack stressed, dead, and dying conifers especially pines. In the Ozark- St. Francis National Forest in Arkansas, there are two species of pine sawyers and they share this sympatric distribution observed throughout the United States, M. titillator (southern ...


Herbivory Impacts On Growth And Survival Of Seedlings In Bottomland Hardwood Forest Restoration Sites In The Post Oak Savannah And Blackland Prairie Ecoregions Of Texas, Usa, Ryan J. Jacques 2017 Stephen F Austin State University

Herbivory Impacts On Growth And Survival Of Seedlings In Bottomland Hardwood Forest Restoration Sites In The Post Oak Savannah And Blackland Prairie Ecoregions Of Texas, Usa, Ryan J. Jacques

Electronic Theses and Dissertations

Interest in bottomland hardwood forests (BLHW) ecology and restoration has increased over the past 40 years. These communities aid in water quality improvement, streambank stabilization, and urban expansion mitigation. They also provide important habitat for many species of wildlife. Since the majority of remaining BLHW are degraded due to land fragmentation, restoration attempts are becoming commonplace within the Western Gulf Coastal Plain. However, restoration success has been mixed, with managers observing survival rates of <15% for desirable species due to various factors. Over two growing seasons, I investigated multiple factors that have potential to limit BLHW restoration success in East Texas. Specifically, I tested the impacts of herbivory by white-tailed deer (Odocoileus virginianus) and feral swine (Sus scrofa) on Nuttall oak (Quercus texana Buckley), Shumard oak (Q. shumardii Buckley), bur oak (Q. macrocarpa Michx.), and pecan (Carya ...


Digital Commons powered by bepress