Root exudation is increasingly being recognized as an important driver of ecosystem processes; however, few studies have examined the degree to which variations in exudate stoichiometry and soil resources affect microbial controls of nutrient availability and decomposition. We added root exudate mimics of varying chemical quality to soils collected from two adjacent forest stands (one a 70 year...

Title of dissertation: EFFICIENCY AND ECOLOGICAL RISKS OF REDUCING SOIL PH DURING THLASPI CAERULESCENS PHYTOEXTRACTION OF CADMIUM AND ZINC Shengchun Wang, Doctor of Philosophy, 2004 Dissertation directed by: Professor Jay Scott Angle Department of Natural Resource Sciences and Landscape Architecture The major aims of this research were to determine whether reducing soil pH can enhance phytoextr...

OBJECTIVES Mindium laevigatum is an endemic plant of Iran and Turkey and is widely used as blood purifier, antiasthma and antidyspnea in traditional medicine. Chemical composition of volatile materials of the plant and its antioxidant, antimicrobial and cytotoxic activities were reported in this study. MATERIALS AND METHODS Simultaneous distillation-extraction (SDE) and GC-Mass-FID analysis w...

An incubation experiment was conducted to study the effect of clay content and composition on organic nitrogen mineralization. The measured mineralization from alfalfa residues, enzyme activities, microbial biomass in mixtures sand, kaolinite, non-layered colloids (NLCs) with sand as a control. found that contents kaolinite NLCs increased, activity decreased, but increased. maximum decrease 88....