Effects of ecological buffer strip on nitrogen,phosphorus,and herbicides in runoff in Xihe River,Fuxin City
The ecological buffer strip between terrestrial ecosystem and aquatic ecosystem can effectively intercept nitrogen,phosphorus,herbicides,and other pollutants in surface runoff into rivers and lakes.Alfalfa,Kentucky bluegrass,tall fescue,ryegrass,and white clover were selected to build ecological buffer strips.A field runoff simu-lation experiment was conducted to explore the effects of vegetation type and buffer strip length on the inhibition and control of surface runoff,ammonium nitrogen(NH4+-N),nitrate nitrogen(NO3--N),total phosphorus(TP),dis-solved phosphorus(DP),particulate phosphorus(PP),acetochlor(AC),and atrazine(AT).The results showed that the five types of ecological buffer strips significantly improved the resistance and control efficiency of runoff and non-point source pollutants,and that the control efficiency of pollutants gradually increased with the increased buf-fer length.Buffer strips of different vegetations effectively reduced surface runoff,with an order of ryegrass＞tall fescue＞Kentucky bluegrass＞white clover＞alfalfa.The 4-m long ryegrass buffer strip had the highest control efficiency for NO3--N,TP,DP,PP,and AC,which reached 72.2％,73.2％,68.8％,83.5％and 70.8％,re-spectively.The 4-m long tall fescue buffer strip had the highest control efficiency for NH4+-N(88.0％)and AT(77.3％).
万方数据
维普
