A5027488510- Soil Carbon and Nitrogen Dynamics
- Soil and Water Nutrient Dynamics
- Soil and Unsaturated Flow
- Peatlands and Wetlands Ecology
- Microbial Community Ecology and Physiology
- Wastewater Treatment and Nitrogen Removal
- Crop Yield and Soil Fertility
- Rangeland and Wildlife Management
- Agriculture, Soil, Plant Science
- Soil erosion and sediment transport
- Soil Management and Crop Yield
- Pesticide and Herbicide Environmental Studies
- Plant nutrient uptake and metabolism
- Metabolism and Genetic Disorders
- Clay minerals and soil interactions
- Heavy metals in environment
- Soil Geostatistics and Mapping
- Bioenergy crop production and management
- Agronomic Practices and Intercropping Systems
- Ruminant Nutrition and Digestive Physiology
- Radioactive element chemistry and processing
- Methane Hydrates and Related Phenomena
- Anaerobic Digestion and Biogas Production
- Geochemistry and Elemental Analysis
- Constructed Wetlands for Wastewater Treatment
University of Tennessee at Knoxville
2017-2025
Oak Ridge National Laboratory
2010-2016
The Ohio State University
2007-2010
Core Ideas After 3 yr, soybean yield was higher from multispecies than single‐ and double‐species cover cropping. Multispecies cropping had soil water inorganic N content less‐diverse treatments. Soil organic C unaffected by crop species diversity. Several years of are needed to achieve ecosystem benefits. has become popular in recent because the multiple benefits compared with or double‐ However, scientific studies on effects cropping—especially southern United States—are limited. A field...
Abstract Cover cropping is a promising strategy to improve soil health, but it may also trigger greenhouse gas emissions, especially nitrous oxide (N 2 O). Beyond nitrogen (N) availability, cover crop residue decomposition accelerate heterotrophic respiration limit O hence promote N emissions from denitrification under sub-optimal water-filled pore space (WFPS) conditions that are typically not conducive large production. We conducted 21-day incubation experiment examine the effects of...
Abstract. The rate and extent of decomposition soil organic carbon (SOC) is dependent, among other factors, on substrate chemistry microbial dynamics. Our objectives were to understand the influence (C), use model fitting quantify differences in pool sizes mineralization rates. We conducted an incubation experiment for 270 days using four uniformly labeled 14C substrates (glucose, starch, cinnamic acid stearic acid) different soils (a temperate Mollisol, a tropical Ultisol, sub-arctic...
The North Central Education and Research Activity Committee (NCERA-59) was formed in 1952 to address how soil organic matter formation management practices affect structure productivity. It is this capacity that we comment on the science supporting quality associated health assessment for agricultural lands with goal of hastening progress important field. Even though suite indicators being applied by U.S. efforts closely mirrors 'minimum data set' developed recommended mid-1990s, question...
The combination of extended dry periods and high intensity rainfall, common in the southeastern US, leads to greater variability soil moisture consequently increases uncertainty microbial processes pertinent carbon (C) mineralization. However, field-based findings on sensitivity C cycling are very limited. Therefore, a field experiment was conducted 2018 2019 soybean (Glycine max L.) cropland US with three treatments: drought (simulated using rainout-shelter from June October each year),...
Enzyme dynamics are being incorporated into soil carbon cycling models and accurate representation of enzyme kinetics is an important step in predicting belowground nutrient dynamics. A scarce number studies have measured activation energy (Ea) soils fewer Ea arctic tropical soils, or subsurface soils. We determined the for four typical lignocellulose degrading enzymes B horizons seven covering six different orders. also elucidated which properties predicted any measurable differences Ea....
Abstract Quantifying the upper limit of stable soil carbon storage is essential for guiding policies to increase storage. One pool considered particularly across climate zones and types formed when dissolved organic sorbs minerals. We quantified, first time, potential mineral soils sorb additional (DOC) six orders. compiled 402 laboratory sorption experiments estimate DOC potential, that excess in addition existing background level already sorbed each sample. estimated this using gridded...
Abstract Climate extremes pose a global threat to crop security. Conservation agriculture is expected offer substantial climate adaptation benefits. However, synergistic effects of conservation practices on yield during normal versus extreme climates and underlying regulatory mechanisms remain elusive. Here, we analyze 29-years data, cotton (Gossypium hirsutum L.) yield, soil data under 32 management in Tennessee, USA. We find that long-term no-tillage enhanced agroecosystem resilience...
Woodchip bioreactor (WBR) is one of the green infrastructures in agriculture system to reduce nitrate from agricultural drainage and stormwater. A lot abiotic factors have been reported that affect removal lacking a comprehensive understanding. In this study, we studied eight important factors, including media age, hydraulic retention time (HRT), influent concentration (Cin), temperature, dissolved organic carbon (DOC), oxygen (DO), pH, effective porosity (ρe) WBR-filling materials. Based on...