人工模拟降雨条件下灰金竹林地表径流特征研究

Characteristics of Surface Runoff in Phyllostachys Nigra Forest Under Simulated Rainfall

为了了解灰金竹林的水土保持效益,选取具有典型代表性的灰金竹林进行了人工模拟降雨实验。以坡耕地为对照,记录产流过程,收集竹林地表径流,并对泥沙含量、含氮量、含磷量等项目进行了测定。实验分析结果表明,在平均降雨强度基本相同,降雨历时接近的条件下,灰金竹林径流系数、平均含沙率、平均含氮量和平均含磷量分别为:0.096 1,0.26%,0.151 6mg/L和0.453 0mg/L;对照坡耕地分别为0.299 0,0.99%,0.198 6mg/L,0.530 4mg/L;说明灰金竹林的水土保持效益显著优于坡耕地。

To elucidate soil and water conservation benefits of Phyllostachys nigra, simulated rainfalls were carried out in both Phyllostachys nigra forest and slope farmland, and the average sediment concentration and contents of nitrogen and phosphorus were determined. The resulted show that in Phyllostachys nigra forest, the runoff coefficient was 0. 096, with average sediment concentration of 0.26 ~, average content of nitrogen of 0. 152 rag/L, and average content of phosphorus of 0. 453 mg/L. In contrast, slope farmland had a runoff coefficient of 0. 299, with average sediment concentration of 0.99%, nitrogen content of 0. 198 6 mg/L, and phosphorus content of 0. 530 4 mg/L. The findings implies that Phyllostachys nigra forest ex- hibited clearly better benefits in regard to water and soil conservation than slope farmland.