Field Experiments on Reducing Pollutants in Agricultural-Drained Water Using Soil-Vegetation Buffer Strips
Agricultural drainage is one of the leading contributors to agricultural non-point source pollution in China.It is difficult to treat, in practice, due to its dispersed nature.In recent years, although agricultural drainage water has been reused in agricultural production, its poor quality has limited its potential utilization.To optimizing its reusing, we designed and tested a treatment system for agricultural-drained water compromising a vegetation buffer, slopes (plant filter), a water collection area, and a soil-retention wall in Hengxi town, Nanjing, Jiangsu Province, China.By exploiting the soil-vegetation buffer strips, nitrogen and phosphorus in the paddy field”s surface drainage are expected to be reduced dramatically.Test results suggested that after applying basal fertilizer, the removal rates of total nitrogen by the soil-vegetation buffer strips are 90.6% and 95.2% for controlled and conventional irrigation-drainage treatments respectively, as well as the removal rates of dissolved nitrogen are 92% and 90.7%.The removal rates of total phosphorus are 94.2% and 92.9%, and for dissolved phosphorus, the rates are 94.4% and 95% respectively.These data indicate that drainage water from the paddy field that has been treated through the constructed system could reach the standard of National Class Ⅱ with two irrigation-drainage methods, while for control treatments water quality can only reach Class V, which is severely contaminated.With this system, the reuse of agricultural water resources could be achieved, which will undoubtedly provide a great potential for agricultural water management in southern China, as well as achieving an excellent overall ecological benefits.
soil-vegetation buffer strips controlled irrigation-drainage rainfall water quality evaluation
Yuanyuan Li Xiaohou Shao Zhuping Sheng
Key Laboratory of Efficient Irrigation-Drainage and Agricultural Soil-Water Environment in Southern Key Laboratory of Efficient Irrigation-Drainage and Agricultural Soil-Water Environment in Southern Texas AgriLife Research Center at El Paso, Texas A&M University, 79927, USA
国内会议
南京
英文
74-88
2015-07-25（万方平台首次上网日期，不代表论文的发表时间）