Research on Multi-Factor Effects of Nitrogen Loss in Slope Runoff
Lei Wang,
Na Wang,
Qing Zhang,
Jiajun Wu,
Shilei Wang,
Min Pang,
Jifeng Wang,
Chao Zhou,
Yehui Han,
Zhixin Yang,
Liang Jin
Affiliations
Lei Wang
Institute of Plant Nutrition, Resources and Environment, Beijing Academy of Agricultural and Forestry Sciences, Beijing 100097, China
Na Wang
Institute of Plant Nutrition, Resources and Environment, Beijing Academy of Agricultural and Forestry Sciences, Beijing 100097, China
Qing Zhang
Institute of Plant Nutrition, Resources and Environment, Beijing Academy of Agricultural and Forestry Sciences, Beijing 100097, China
Jiajun Wu
Key Laboratory for Farmland Eco-Environment of Hebei Province, State Key Laboratory of North China Crop Improvement and Regulation, College of Resources and Environmental Sciences, Hebei Agricultural University, Baoding 071001, China
Shilei Wang
Beijing Miyun District Soil and Water Conservation Workstation, Beijing 101500, China
Min Pang
Institute of Plant Nutrition, Resources and Environment, Beijing Academy of Agricultural and Forestry Sciences, Beijing 100097, China
Jifeng Wang
Beijing Gaoling Water Station of Miyun District Water Bureau, Beijing 101500, China
Chao Zhou
Qiqihar Branch of Heilongjiang Academy of Agricultural Sciences, Qiqihar 161000, China
Yehui Han
Qiqihar Branch of Heilongjiang Academy of Agricultural Sciences, Qiqihar 161000, China
Zhixin Yang
Key Laboratory for Farmland Eco-Environment of Hebei Province, State Key Laboratory of North China Crop Improvement and Regulation, College of Resources and Environmental Sciences, Hebei Agricultural University, Baoding 071001, China
Liang Jin
Institute of Plant Nutrition, Resources and Environment, Beijing Academy of Agricultural and Forestry Sciences, Beijing 100097, China
To study the characteristics of nitrogen (N) loss on slopes, different vegetation (bare soil, alfalfa), slopes (5°, 10°, 15°), and rainfall intensities (40, 60, 80 mm/h) were set as variable factors in simulated rainfall experiments. Surface runoff accounts for 60.38–96.16% of total runoff and most N loss (57.69–88.67% of NO3−-N). Alfalfa can reduce average concentrations of N loss in runoff and reduce N loss in surface runoff by more than 48.29%, as well as subsurface runoff by 3.8%. Average N loss in subsurface runoff exceeds that of surface runoff. Rainfall intensity most affects N loss from surface runoff in bare soil conditions, and slope most affects N loss in subsurface runoff. Rainfall intensity in alfalfa treatments most influences runoff volume and N loss. The comprehensive effects of rainfall intensity, slope, and vegetation cover on the total loss of various forms of nitrogen in surface runoff can be described using a linear correlation equation, with a correlation coefficient between 0.84 and 0.91.
