Effect of Vegetation Configuration in Riparian Buffer Strip on Phosphorus Retention in Runoff Water
[Objective]To study the effect of different buffer strips on phosphorus retention in runoff,and provide reference for the selection of suitable buffer zones and effective control of eutrophication in Taihu Lake.[Methods]Seven riparian buffer strips of 20 m x 40 m in Taihu Lake area were used to compare the effects of riparian buffer strips with different widths(15,30 and 40 m),different vegetation types(Populus×euramericana'Nanlin 95'plantation,Taxodium'Zhongshanshan'plantation,and'Nanlin 95'-'Zhongshan-shan'mixed plantation)and different stand densities(400,1,000 and 1,600 tree·hm-2)on the retention of total phosphorus(TP)and soluble phosphorus(DP)in runoff water.[Results](1)The interception of TP and DP in runoff water was significantly better in winter than in spring.The retention rate of DP in runoff water was significantly higher than that of TP in the buffer strips.(2)Different riparian buffer strips had dif-ferent requirements for width.For Taxodium'Zhongshanshan'forest,mixed forest,and poplar forest of 400 and 1 000 tree·hm-2,a 15m wide riparian buffer strip could basically meet the demand for phosphorus in-tercept.For the poplar forests with 1 600 tree·hm-2,a riparian buffer zone of more than 40 m width was re-quired to meet the phosphorus retention requirement.(3)For the buffer zone of Taxodium'Zhongshan-shan'forest and poplar forest,the buffer strip with a stand density of 400 tree·hm-2 had the best effect on the retention of TP and DP in runoff water.(4)The interception effect of Taxodium'Zhongshanshan'forest buffer zone on phosphorus in runoff was better than that of mixed forest and poplar forest buffer zone,and Taxodium'Zhongshanshan'could be used as the first choice for constructing riparian buffer strips in Taihu Lake.[Conclusion]The Taxodium'Zhongshanshan'forest buffer strip with a width of 15 m and 400 tree·hm-2 can achieve the maximum effect on phosphorus retention in runoff.
万方数据
维普
