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 14 of 14 for “"Leaf breakdown"”.
-
Impacts of Land-Use on Leaf Breakdown and Macroinvertebrate Assemblages in Southern Appalachian Streams
… exurban, agricultural). Impacts of land-use on leaf breakdown are examined in Chapter 1. Leaf breakdown rates were significantly related to land-use. Forested streams exhibited the slowest breakdown rates, followed by exurban streams, with agricultural streams having the fastest rates. Leaf …
-
Influence of Agricultural Land Use on Allochthonous Input and Leaf Breakdown in Southern Appalachian Streams
… to measure and compare allochthonous input and leaf breakdown rates along a gradient of agricultural land use in southern Appalachian streams. Study streams were placed into the following land use categories: forest and light, moderate, and heavy agriculture. Several physical, chemical, and …
-
The influence of elevated arsenic concnetrations on stream biota and leaf breakdown in a headwater stream
… five times throughout the course of a year. Leaf breakdown assays were conducted in reference and mine-influenced reaches. Leaf biofilm respiration was recorded during leaf breakdown assays and also with experimental arsenic additions to reference reach leaf biofilms. At the field site, …
-
Influences of land use on the structure and function of headwater streams: A multiple scale analysis
… The relationship between land-cover patterns and leaf breakdown is examined in Chapter 2. Breakdown rate for American sycamore (Plantanus occidentalis) leaf packs varied significantly among sites (k = 0.0051 to 0.0180 d-1), but fell within the range reported in the literature for sycamore. Leaf …
-
The Role of Floods in Particulate Organic Matter Dynamics of a Southern Appalachian River/Floodplain Ecosystem
… North Carolina, USA. I measured litter inputs, leaf breakdown, floodplain litter, and aboveground herbaceous net primary production at 12 sites. Annual litter inputs (274-625 g m-2 y-1) were typical of a temperate deciduous forest, but lower than other floodplain forests in the eastern United …
-
Organic carbon dynamics of the Neches River and its floodplain.
… to normal abscission in the fall. A continuum of leaf breakdown rates was observed in three common floodplain species of trees: Sapium sebiferum, Acer rubrum, and Quercus laurifolia. Leaves collected from blowdown as a result of Hurricane Rita did not break down significantly faster than leaves …
-
Organic Matter Processes of Constructed Streams and Associated Riparian Areas in the Coalfields of Southwest Virginia
… were evaluated: riparian litterfall input, leaf breakdown, and periphyton accrual. Constructed streams were typically warmer than reference streams and also had elevated specific conductance, elevated oxidized nitrogen concentrations, depressed benthic macroinvertebrate richness, and lower …
-
Stream functional response to mountaintop removal and valley fill coal mining
… affect of MTRVF on stream ecosystem function, leaf breakdown, which is an ecosystem level attribute of forested streams, was measured in five streams draining MTRVF sites and five reference streams in central West Virginia. Leaf packs of white oak and red maple were installed in these streams …
-
The effects of cattle exclusion on stream structure and function
… for integrity to be restored. I predicted leaf processing (a fundamental ecosystem level function) in streams would be influenced by excluding cattle from the riparian zone due to changes in nutrient availability, sediment abundance, shredding macroinvertebrates, and microbial activity. I …
-
Livestock Exclusion Effects on the Structure and Function of Headwater Streams
… benthic macroinvertebrates, algal biomass, and leaf breakdown in non-fenced, fenced, and forested streams. Increased growth of non-woody vegetation and the pre-existence of woody plants had a significant influence on stream organic matter dynamics. Tree basal area in a 20 m wide riparian …
-
The role of shredders in detrital dynamics of permanent and temporary streams
… strewn detrital dynamics. The importance of leaf shredding aquatic insects (shredders) in the breakdown of leaf detritus and production of particulate organic matter (POM) was evaluated in three permanent and three temporary southern Appalachian headwater streams. Shredder population dynamics …
-
Legacies of Early 20th Century Logging in Southern Appalachian Streams
… related to debris dam abundance. Mean breakdown rate of experimental leaf packs and wood veneers was not significantly different between unlogged and logged streams. Leaf breakdown was strongly related to shredder colonization, while wood breakdown was unrelated to variables measured. …
-
Organic Matter Dynamics and Trophic Structure in Karst Groundwater
… films in karst aquifers. The process of leaf and wood breakdown in cave streams in Organ Cave, West Virginia is examined in Chapter 2. Leaf and wood breakdown rates and microbial biomass and respiration on leaves and wood were compared between cave streams with and without coarse …
-
Microbial Communities Colonizing Leaves during Early Decomposition Stages
… community composition between different leaf types during breakdown in stream ecosystems. To achieve this objective, I used a combination of field and laboratory trials. Field experiments were performed at the Luquillo Experimental Forest using <em>Dacryodes excelsa</em> and <em>Cecropia …