A5018495339- Soil Carbon and Nitrogen Dynamics
- Nematode management and characterization studies
- Microbial Community Ecology and Physiology
- Invertebrate Taxonomy and Ecology
- Ecology and Vegetation Dynamics Studies
- Soil and Water Nutrient Dynamics
- Legume Nitrogen Fixing Symbiosis
- Mycorrhizal Fungi and Plant Interactions
- Isotope Analysis in Ecology
- Peatlands and Wetlands Ecology
- Forest Ecology and Biodiversity Studies
- Rangeland and Wildlife Management
- Insect and Arachnid Ecology and Behavior
- Pesticide and Herbicide Environmental Studies
- Agronomic Practices and Intercropping Systems
- Plant and animal studies
- Study of Mite Species
- Soil erosion and sediment transport
- Protist diversity and phylogeny
- Plant Water Relations and Carbon Dynamics
- Marine Biology and Ecology Research
- Soil and Unsaturated Flow
- Genomics and Phylogenetic Studies
- Coastal wetland ecosystem dynamics
- Parasite Biology and Host Interactions
University of Georgia
2010-2024
Henry Ford Health System
2023
Oxford Policy Management
2022
University of Oxford
2022
LEK Consulting (United States)
2018
Colorado State University
1981-2013
The Ohio State University
2010
University of Technology Sydney
2010
University of North Carolina at Chapel Hill
2004
Royal Netherlands Academy of Arts and Sciences
2000
Abstract Traditional approaches to the study of food webs emphasize transfer local primary productivity in form living plant organic matter across trophic levels. However, dead matter, or detritus, a common feature most ecosystems plays frequently overlooked role as dynamic heterogeneous resource and habitat for many species. We develop an integrative framework understanding impact detritus that emphasizes ontogeny heterogeneity various ways explicit inclusion detrital dynamics alters...
The most common system responses attributed to microfloral grazers (protozoa, nematodes, microarthropods) in the literature are increased plant growth, N uptake by plants, decreased or bacterial populations, CO 2 evolution, and P mineralization, substrate utilization. Based on this evidence literature, a conceptual model was proposed which were considered as separate state variables. To help evaluate model, effects of microbivorous nematodes microbial nutrient cycling, examined with...
Assistant professor in the Department of Biology at Western Washington University, Bellingham, 98225-9160 10: Professor Laboratoire d'Ecologie de Sols Tropicaux, ORSTOM/Universite Paris VI, 32 Avenue Henri Varagnat, 93143 Bondy, France 11: Senior scientist Centre for Terrestrial Ecology, Netherlands Institute 6666 ZG Heteren, Utrecht, 12: Environmental Studies, University 13: Soil Biology, Academy Sciences Czech Republic, Na sadkach 7, 370 05 Ceske Budejovice, Republic 14: Science,...
Abstract No‐tillage (NT) practices can improve soil aggregation and change the distribution retention of organic matter (SOM) compared with conventional tillage (CT), but relationships between aggregates SOM fractions are poorly known. The effects long‐term (13‐yr) CT NT management on water‐stable (WSA) aggregate‐associated were investigated a Hiwassee sandy clay loam (clayey, kaolinitic, thermic Rhodic Kanhapludult). Samples collected at two depths in replicated plots separated into five...
Abstract No‐tillage (NT) practices can result in greater soil aggregation and higher organic matter (SOM) levels than conventional‐tillage (CT) practices, but the mechanisms for these effects are poorly known. Our objectives were to describe size quality of biologically active pools aggregate‐associated SOM long‐term CT NT soils southeastern USA. Samples collected from replicated plots on a Hiwassee sandy clay loam (clayey, kaolinitic, thermic Rhodic Kanhapludult) separated into four...
We conducted field experiments to test the general hypothesis that composition of decomposer communities and their trophic interactions can influence patterns plant litter decomposition nitrogen dynamics in ecosystems. Conventional (CT) no—tillage (NT) agroecosystems were used this idea because structural simplicity known differences functional properties. Biocides applied experimentally exclude bacteria, saprophytic fungi, microarthropods exclosures. Abundances organisms (bacteria,...
Journal Article Detritus Food Webs in Conventional and No-tillage Agroecosystems Get access Paul F. Hendrix, Hendrix Search for other works by this author on: Oxford Academic Google Scholar Robert W. Parmelee, Parmelee D. A. Crossley, Jr., Jr. David C. Coleman, Coleman Eugene P. Odum, Odum Peter M. Groffman BioScience, Volume 36, Issue 6, June 1986, Pages 374–380, https://doi.org/10.2307/1310259 Published: 01 1986
Two different agricultural tillage practices were used to study how changes in the structure of soil—litter system affected litter decomposition rates, microbial community composition, and soil organic matter dynamics. Surface straw placement results spatial separation carbon—rich (C:N ratio 80:1) mineralized nitrogen. In contrast, when is plowed into soil, carbon nitrogen are intimate contact. Our field studies Colorado showed that fungal biomass surface—straw treatments was 144%...
Microbial trophic structure and available soil pore space influence rates of decomposition mineralization. The nematode (Mesodiplogaster) used feeds on bacteria (Pseudomonas) as well amoebae (Acanthamoeba) but grows best in the presence amoebae. Respiration were higher when both grazers grown with (food web) than singly (simple food chain). We hypothesized that one reason for increased growth is protozoa make more to nematodes by entering pores inaccessible nematodes, feeding within pores,...
The responses of decomposition and primary production to nitrogen supply were investigated in a shortgrass prairie, mountain meadow, lodgepole pine forest. Nitrogen (N) was increased by applying ammonium nitrate, or decreased sucrose. litterbag technique used follow leaves the dominant plants: blue grama (Bouteloua gracilis) from western wheatgrass (Agropyron smithii) (Pinus contorta) Soil beneath litterbags sampled at time retrieval order detect interactions between properties underlying...