湿地松林的地表径流及钾流失特征

Characteristics of Surface Runoff and Potassium Export in a Pinus elliottii Stand

通过径流场对湿地松林的地表径流和径流中的钾质量分数和流失量进行了研究.结果表明,年径流量为16.7 mm,主要集中在夏季.年地表径流系数为0.80%.地表径流与降雨量的关系可以用二项式方程表示.湿地松林各月的地表径流钾质量分数为1.8-18.6 mg·g^-1,降雨量大的月份地表径流中的钾质量分数低,而降雨量小的月份钾质量分数高.湿地松林的地表径流中钾的年流失量为648 g·hm^-2,径流量是决定钾流失量的主要因子.地表径流量与钾质量分数之间存在着负指数关系.

Seasonal pattern of mass fraction of K and export of runoff in a Pinus elliottii stand was investigated using runoff plot method.Annual runoff amount was 16.7 mm mainly occurred in summer and annual runoff coefficient was 0.80%.The correlation between rainfall and runoff could be expressed using a binomial equation.Monthly mass fraction of K in runoff in the P.elliottii stand ranged from 1.8 to 18.6 mg·kg^-2 with high mass fraction of K in heavy rainfall months and low mass fraction of K in small rainfall months. The K factor for K loss. A tion of K in runoff loss in the P. elliottii negative exponential stand was 648 g · hm^-2 and runoff amount was the main effect factor for K loss. A negative exponential relationship existed between the surface runoff and the mass fraction of K in runoff.