Impact of surrounding land use types on nitrogen in Xihe River of West Sichuan Plain
WAN Ke-jun1, DENG Ou-ping1,2, DENG Liang-ji1, WU Ming3, KOU Chang-jiang1, ZHANG Yu-hao1
1. College of Recourse, Sichuan Agricultural University, Chengdu 611130, China;
2. College of Environment, Sichuan Agricultural University, Chengdu 611130, China;
3. Soil and Fertilizer Research Institute of Sichuan Province, Chengdu 610066, China
This research was conducted in a typical agricultural small watershed in the western Sichuan Basin. The nitrogen (NH4+-N, NO3--N, TN) concentration and pH in Xihe river were continuously monitored from March 2015 to February 2016. Using different techniques, such as remote-sensing interpretation, geographic information systems, and correlation analysis, the relationship between nitrogen concentration and pH in the river with surrounding land use typed area was explored. Results showed that river nitrogen concentration was higher in the winter (2.063mg/L) than in spring and autumn (1.536mg/L; 1.432mg/L), followed by summer (1.085mg/L). Concurrently, the monthly average concentration of NO3--N (0.891mg/L) was significantly higher than that of NH4+-N (0.425mg/L) (P<0.01), and NO3--N was remarkably affected by typical land use types. As the buffer zone radius increased, the correlation of cultivated land, urban-rural construction land, and water area with NO3--N and TN concentrations gradually decreased. In the 250m buffer zone, the area of urban-rural construction land was significantly positively correlated with NO3--N concentration (P<0.05), and the transportation land was increasingly correlated with all nitrogen components. In the 750m buffer zone, the area of transportation land was significantly positively correlated with NO3--N and TN concentrations (P<0.01). Urban-rural construction land and transportation land may be the "source" of river NO3--N.
万柯均, 邓欧平, 邓良基, 吴铭, 寇长江, 张宇豪. 周边土地利用类型对川西平原西河氮素的影响[J]. 中国环境科学, 2018, 38(12): 4669-4677.
WAN Ke-jun, DENG Ou-ping, DENG Liang-ji, WU Ming, KOU Chang-jiang, ZHANG Yu-hao. Impact of surrounding land use types on nitrogen in Xihe River of West Sichuan Plain. CHINA ENVIRONMENTAL SCIENCECE, 2018, 38(12): 4669-4677.
Ahearn D S, Sheibley R W, Dahlgren R A, et al. Land use and land cover influence on water quality in the last free-flowing river draining the western Sierra Nevada, California[J]. Journal of Hydrology, 2005, 313(3):234-247.
[15]
Huang H, Lu J. Identification of river water pollution characteristics based on projection pursuit and factor analysis[J]. Environmental Earth Sciences, 2014,72(9):3409-3417.
[16]
Bu H, Wei M, Yuan Z, et al. Relationships between land use patterns and water quality in the Taizi River basin, China[J]. Ecological Indicators, 2014,41(3):187-197.
[17]
Bu H, Zhang Y, Meng W, et al. Effects of land-use patterns on in-stream nitrogen in a highly-polluted river basin in Northeast China[J]. Science of the Total Environment, 2016,553(553):232-242.
Ding J, Jiang Y, Liu Q, et al. Influences of the land use pattern on water quality in low-order streams of the Dongjiang River basin, China:A multiscale analysis[J]. Science of the Total Environment, 2016,551-552,205-216.
Sila V D P R D, Silva M T, Singh V P, et al. Simulation of stream flow and hydrological response to land-cover changes in a tropical river basin[J]. Catena, 2018,162:166-176.
[29]
Nhapi I, Hoko Z, Siebel A, et al. Assessment of the major water andutrient folws in the Chivero Catchment area, Zimbabwe[J]. Physics and Chemistry of the Earth, 2002,27:783-792.
Deng O, Zhang S, Deng L, et al. Wet nitrogen deposition across the urban-intensive agricultural-rural transect of a small urban area in southwest China[J]. Environmental Science and Pollution Research, 2018,(25):7866-7874.
Song L, Kuang F, Skiba U, et al. Bulk deposition of organic and inorganic nitrogen in southwest China from 2008 to 2013[J]. Environmental Pollution, 2017,227:157.