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 8 of 8 for “"Root decomposition"”.
-
Groundwater Thresholds for Root Decomposition and the Relation to Barrier Island Ecological State Changes
… Site in Virginia, USA, thresholds to belowground decomposition rates were identified by measuring decay of native roots and rhizomes at 32 elevations in relation to mean annual groundwater levels (-0.356 – 1.937 m). Negative exponential decay rates (k = 0.310 – 0.915 yr<sup>-1</sup>) varied …
-
The Role of Nitrogen Availability, Hydroperiod and Litter Quality in Root Decomposition Along a Barrier Island Chronosequence
<p>The decomposition of organic matter regulates carbon and nutrient flux between biotic and abiotic pools. Traditional research emphasizes above ground decomposition processes and, by inference, extends these findings to below ground systems. The study, conducted along a southeastern Atlantic …
-
Lignin and carbon transformation in roots of maize and mixed perennial biofuel crops
… to assess the impact of residue quality on root decomposition rate.</p> <p>The acetyl bromide method was used to determine the total soluble lignin, and the alkaline CuO oxidation method was used to characterize lignin quality by the abundance of vanillyl, syringyl, and cinnamyl monomers. …
-
Evaluating Crop Physiological and Stand Age-Related Controls Over Soil Carbon and Nitrogen Dynamics In Perennial and Annual Grains
… we established three studies to quantify 1) root growth and decomposition, 2) C uptake and partitioning to crop-microbial-soil pools, and 3) N sources and N conservation in first-year IWG (IWG-1), second-year IWG (IWG-2), third-year IWG (IWG-3) and annual wheat (Wheat). These studies …
-
Nutrient constraints on plant community production and organic matter accumulation of subtropical floating marshes
… formation—plant production and organic matter decomposition. I conducted several field studies to understand whether belowground organic matter accumulation and decomposition were affected with increased nutrient exposure; in addition, the plant community was monitored over three years. A …
-
Effects of plant invasions on ecosystem processes: Linking above- and below-ground resource-use strategies of native and invasive species in Eastern U.S. forests
… amount of N from litter, they had greater root production and specific root length associated with a greater soil nutrient uptake capacity than natives. In the second study, I examined whether the different tissue traits are associated with litter decomposition rate and if invaders can …
-
Root Dynamics, Management Effects and Carbon Sequestration on Invaded and Native Semi-Arid Grasslands
Root dynamics are a major component of terrestrial ecosystem processes but they have not been broadly studied, due to the difficulty of quantifying root production and mortality. The use of minirhizotrons facilitates belowground research, but sample intervals are controversial since long intervals …
-
Effects of Elevated Atmospheric CO2 on Root Growth, Turnover and Decomposition in a Scrub Oak Ecosystem
… function are not well understood. Measurement of root growth response to elevated atmospheric carbon dioxide is critical to understanding soil carbon input. I investigated the effects of elevated carbon dioxide on fine root growth and decomposition using open top chambers with both ambient and …