Effects forages on nitrogen and phosphorus loss from sloping land draining into the Three Gorges Reservoir

doi:10.11686/cyxb2016350

Abstract

Abstract: The research was conducted in a small catchment, Wangjiagou, draining into the Three Gorges Reservoir. We combined field experiments and laboratory analysis; corn was used as the control (T₁), which was compared to Lolium perenne (T₂), Purus frumentum (T₃) and Sorghum bicolor (T₄). Samples of the surface runoff after rainfall from May to August in 2015 were collected and analysed for nitrogen (N) and phosphorus (P) allowing losses to be calculated. The results showed that all three forages significantly reduced N and P losses both in the runoff and the sediment. The most effective species was P. frumentum; N and P losses caused by natural rainfall occurred mainly in sediment which accounted for 76.34%-79.97% and 81.69%-83.90% of total N and total P losses, respectively. The fresh and dry biomass yields of L. perenne and P. frumentum were higher than corn, the mean advantage being 4.45 and 1.52 times, and 4.89 and 1.53 times that of corn, respectively. The nutrient sequestration effect of the four crop types were ranked T₂, T₃>T₄>T₁. The nutrient sequestration and feed economic benefits of P. frumentum indicate that it has the greatest potential as a substitute for corn in Three Gorges Reservoir catchments, followed by L. perenne.

GOU Tao-Ji, GAO Ming, WANG Zi-Fang, LIU Bin-Bin, HUANG Rong. Effects forages on nitrogen and phosphorus loss from sloping land draining into the Three Gorges Reservoir[J]. Acta Prataculturae Sinica, 2017, 26(4): 53-62.

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