Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 20 of 81 for “"forest soils"”.
-
Virgin hardwood forest soils of western North Carolina
Little is known about the original properties of soils in the East. Eight virgin soils and associated southern Appalachian hardwood vegetation were studied in western North Carolina. The study sites ranged in elevation from 720 to 1200 m on steep slopes. Overall these soils are quite deep and …
-
Regional Nutrient Budgets in Forest Soils in a Policy Perspective
Sweden's forests are one of its most important natural resources, as well as being important from ecological and social perspectives. Nutrient sustainability is essential to maintain the production capacity and reduce the effects of acidification and eutrophication. Nutrient sustainability is …
-
Long-term changes in forest soils of Maine and Illinois
… soil studies to different ecosystems such as forests due to their crucial role in carbon sequestration and to maintain forest productivity. The overall objective of this study was to understand how forest soils change on a long-term basis by utilizing ecosystems in Maine and Illinois. Specific …
-
Carbon and nitrogen mineralization in temperate forest soils at low temperatures
… (C) and nitrogen (N) mineralization in temperate forest soils was often considered negligible at low temperatures during the dormant season, which is questioned by recent findings. Climate models predict warmer winters but little is known about the temperature sensitivity of C and N mineralization …
-
Occurrence and Characteristics of Nonfruiting Myxobacteria Isolated from Pine Forest Soils
… of nonfruiting myxobacteria isolated from pine forest soil Three years after a prescribed burn, the population of nonfruiting myxobacteria was decreased in the burn site. The organisms isolated were distinct from any of the known species of nonfruiting myxobacteria, and apparently are new …
-
Interactions among tree species and pathogen-suppressive bacteria in tropical forest soils
In tropical forests, soil-borne plant pathogens are thought to regulate diversity by driving negative plant-soil feedbacks and promoting density-dependent mortality of seedlings close to parent trees. Pathogens interact with a myriad of other organisms in soil that have the potential to moderate …
-
Long-term Effects of Fertilization on Phosphorus Biogeochemical Pools in Forest Soils
… While the absolute quantities of P in forests soils may be large, the concentration of inorganic P in the soil solution is typically very small (< 0.01 mg L²-1). A onetime application of just 56 kg P ha²-1 can substantially increase growth of pine stands over a 20 year rotation …
-
Catchment Structure Regulates Hydrodynamic Drivers of Chemical Weathering in Shallow Forest Soils
… spatial patterns in chemical weathering in a forested headwater catchment. In the first chapter, relationships between hydrologic behavior, fluxes of weathered elements, and the extent of soil elemental loss across landscape positions are established. The second chapter investigates what …
-
SOIL ORGANIC CARBON IN MID-ATLANTIC REGION FOREST SOILS: STOCKS AND VERTICAL DISTRIBUTION
… carbon (Boschi et al., 2018) and temperate forest soils have been a major sink for atmospheric carbon; however, determining the size of the soil organic carbon stock can be problematic. Sampling practices vary for sampling depth, and determining the density of the soil. The aforementioned …
-
Organic carbon and fertility of forest soils on the Allegheny Plateau of West Virginia
… 1020 m in elevation in the Monongahela National Forest in West Virginia were sampled and analyzed for soil organic and soil microbial biomass carbon as well as various fertility parameters. Additionally, vegetative biomass estimates were made at the sampling sites. The soil series sampled …
-
Pine Seedling Survival and Growth Related to Moisture Retention of Eight Texas Forest Soils
… moisture retention characteristics. Costly reforestation failures can be avoided by examining the soil moisture retention characteristics of prospective planting sites to determine mortality risks and required site preparation in this or other areas that are characterized by recurrent …
-
Effects of Ponderosa Pine Ecological Restoration on Forest Soils and Understory Vegetation in Northern Arizona
… pine (<em>Pinus ponderosa </em>Dougl ex Laws) forest ecosystems. These changes include increased numbers of tree stems, reduced understory cover and diversity, and the introduction of invasive, non-native understory species. This study evaluated the coverage and species composition of …
-
Effects of Western Spruce Budworm Herbivory on Forest Soils and Litter Decomposition in Central Washington
… by herbivores can drive nutrient cycling in forest ecosystems by adding frass, carcasses, and molts to the forest floor which are broken down into nitrogen, phosphorous, and other elements to be recycled into biomass. Western spruce budworms are defoliators native to the central Cascades and …
-
Taxonomy, genesis, and parent material distribution of high- elevation forest soils in the southern Appalachians
High-elevation spruce-fir forests in the southern Appalachians may potentially be in a state of decline as a result of either natural or anthropogenic causes. Soils were investigated in areas representative of 117 permanent intensive field plots established to evaluate changes in forest composition …
-
Environmental controls on the abundance, diversity, growth, and activity of ammonia-oxidizing microorganisms in temperate forest soils
… microbial communities in temperate forest soils. Accomplishing this goal required a hybrid approach: I used modern molecular biology techniques alongside soil biogeochemical measurements and framed my research using ecological theory largely developed in plant systems. All of my …
Page 1 of 5