Phosphorus mobility in a karst landscape under pasture grazing system
Allousha, G. A.
Boyer, D. G.
Belesky, D. P.
Halvorson, J. J.
MetadataShow full item record
The spatial distribution and partitioning of water dissolved phosphorus fractions in the soil profile of a grazed karst sinkhole landscape were investigated. We also measured P fractions in surface runoff entering a sinkhole drain and in karst spring flow draining the study area. Grazing increased total N, C, and all forms of P of soil. Dissolved inorganic orthophosphate (DPi) was the highest in the surface soil layer and diminished significantly with depth. The proportion of dissolved unreactive phosphorus (DPu) increased with soil depth. Changes in DPu with landscape position and depth were closely correlated with changes in dissolved organic carbon (DOC) suggesting that the mobility and transport of DPu was mediated by DOC. Landscape position sampling showed molybdate reactive phosphorus (MRP) and DPu increased toward the bottom and center of sinkholes. The distribution of DPi and DPu in surface runoff and that occurring in underground watercourses confirms the significance of DPu transported into karst groundwater.
Showing items related by title, author, creator and subject.
Effect of Form and Amount of Phosphorus and Phytase Supplementation on Phosphorus Utilization by Ruminants Shanklin, Rachel Kristina (Virginia Tech, 2001-07-11)EFFECT OF AMOUNT AND FORM OF PHOSPHORUS AND PHYTASE SUPPLEMENTATION ON PHOSPHORUS UTILIZATION BY RUMINANTS by Rachel Kristina Shanklin Committee Chair, Joseph P. Fontenot Animal and Poultry Sciences (ABSTRACT) The ...
Kinetics of the release and precipitation of phosphorus in anaerobic digesters sequencing biological phosphorus removal systems Sen, Dipankar (Virginia Polytechnic Institute and State University, 1986)
The effects of various concentrations of phytase on broiler growth performance, phosphorus digestibility, tibia ash, and phosphorus utilization Mou, Connie (Virginia Tech, 2016-09-22)Two experiments were conducted to determine the effects of various phytase concentrations on broiler growth performance, carcass composition, phosphorus digestibility, tibia ash and phosphorus utilization. The first ...