Comparison of nitrogen losses by runoff from two different cultivating patterns in sloping farmland with yellow soil during maize growth in Southwest China  

作　　者：HE Shu-qin MA Rui WANG Na-na WANG Shuang LI Ting-xuan ZHENG Zi-cheng 

机构地区：[1]College of Forestry,Sichuan Agricultural University,Chengdu 611130,P.R.China [2]College of Resources Science,Sichuan Agricultural University,Chengdu 611130,P.R.China

出　　处：《Journal of Integrative Agriculture》2022年第1期222-234,共13页农业科学学报（英文版）

基　　金：financial support provided by the National Natural Science Foundation of China(41271307);the Key R&D Project of Sichuan Province,China(2019YFS0463)。

摘　　要：The loss of N in farmland is an important cause of agricultural non-point source pollution, which seriously impacts the aquatic environment. A two-year(2017–2018) experiment was conducted to investigate the characteristics of runoff and N losses under different tillage practices. Taking downslope ridge planting and cross ridge planting as the experimental treatments,the characteristics of surface runoff, interflow, and N losses in sloping farmlands with yellow soil were studied throughout the maize growth period. As the rainfall increased, the surface runoff and interflow also increased. The surface runoff and N losses in the surface runoff of downslope ridge planting were significantly higher than those of cross ridge planting. The interflow volumes and N losses in the 0–20 and 20–40 cm soil layers of the cross ridge planting were significantly higher than those of the downslope ridge planting. The total N(TN) losses from surface runoff accounted for 54.95–81.25% of the N losses from all pathways. Therefore, we inferred that surface runoff is the main pathway of N losses. Dissolved total N(DTN) was the main form of N loss under different tillage measures, as it accounted for 55.82–94.41% of the TN losses,and dissolved organic N accounted for 52.81–87.06% of the DTN losses. Thus, we inferred that dissolved N is the main form of N loss. Future research must focus on the prevention and control of the N losses during the maize seedling stage to reduce the environmental pollution caused by ammonium N through runoff.

关 键 词：nitrogen losses surface runoff INTERFLOW maize growth stages tillage measures 

分 类 号：S513[农业科学—作物学]