佛山市湿地松林地表径流中可溶解性氮和磷的流失特征

研究了佛山的湿地松林地表径流及可溶解性氮和磷流失的特点.结果表明,湿地松林的年径流量为16.7 mm,集中在夏季.林分的地表径流量和降雨量的关系按照二项式方程变化.地表径流中氮浓度与径流量之间存在着对数关系.湿地松林的地表径流中可溶解性氮输出量为221g/(hm2·a),春季和夏季为氮流失高峰期,占可溶解性氮年流失量的80%以上.湿地松林地表径流中可溶解性磷流失量为7.0g/(hm2·a),2008年5月和6月为湿地松林的地表径流中可溶解性磷流失高峰,占该年流失量的59%.

haracteristics of Dissolvable Nitrogen and Phosphorus Losses in Runoff from a Pinus Elliottii Stand in Foshan City

The characteristics of runoff and dissolvable nitrogen and phosphorus losses from a Pinus elliottii stand were studied in Foshan City.The annual amount of runoff from the Pinus elliottii stand was 16.7 mm,which was mainly observed in summer.The relationship between rainfall and runoff in the stand could be described by a binomial equation.A logarithmic relationship existed between runoff and N concentration.Annual dissolvable N loss from the stand was 221g/(hm²?a) and in spring and summer,it reached its peak with above 80% of annual dissolvable N loss.Annual dissolvable P loss from the stand was 7.0g/(hm²?a).The greatest monthly dissolvable P loss occurred in May and June,2008,accounting 59% of its annual P loss.