Vol19 No.8: 2333-2345
【Title】Transport of phosphorus in runoff and sediment with surface runoff from bare purple soil during indoor simulated rainfall
【Author】MA Xiao1,2*; YANG Jie1;. ZHOU Xiang-jun1; WU Hong-tao1; XIONG Qiao1; LI Ye3*
【Addresses】1 College of Urban and Environmental Sciences, Hubei Normal University, Huangshi 435002, China; 2 Hubei Key Laboratory of Pollutant Analysis & Reuse Technology, Hubei Key Research Institute of Humanities & Social Science, Huangshi 435002, China; 3 School of Resource and Environmental Engineering, Wuhan University of Technology, Wuhan 430070, China
【Corresponding author】MA Xiao; LI Ye
【Citation】Ma X, Yang J, Zhou XJ, et al. (2022) Transport of phosphorus in runoff and sediment with surface runoff from bare purple soil during indoor simulated rainfall. Journal of Mountain Science 19(8). https://doi.org//10.1007/s11629-021-7242-0
【Abstract】Phosphorus (P) in surface runoff from purple soil is a critical element of agricultural non-point source pollution, leading to eutrophication of surface waters in the Three Gorges Reservoir Area (TGRA) of China. This work aimed to understand the processes and mechanisms of P losses from bare purple soil. Based on an indoor rainfall simulation experiment, we focused on the processes of surface runoff and P losses via different hydrological pathways. Experimental treatments included three simulated rainfall intensities, four slope gradients, and three fertilizer treatments. P loss from sediment was the main pathway in the purple soil, and bioavailable P was mainly transferred in dissolved P (DP) of runoff water. The P loss loads tend to grow with the increase of the slope until 25° for the maximum load of runoff water and 20° for the maximum load of sediment. Concentrations of DP in the surface runoff after fertilizer application can exceed the estimates of those required for accelerated eutrophication. Sediment P control might be an essential way for reducing P loss in purple soil for the local government and farmers of TGRA.
【Keywords】Surface runoff; Sediment yield; Phosphorus loss; Purple soil; Simulated rainfall