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对分别为 82 5、4 95、330丛· hm-2 3种种植密度麻竹 ( Dendrocalamus latiflorus Munro)人工林的地表径流进行了 4年的定位观察和综合分析 ,结果表明 :麻竹人工成林不发生地表径流的最大降水量为 3～ 5mm/次 ;其地表径流量和泥沙流失量的大小与降水量呈正线性相关 ;地表径流量与降水间隔时间和林分密度呈负相关。密度为 330丛·hm-2 林分年平均地表径流量和土壤侵蚀模数为 38.1mm和 16.0 t· km-2 a-1,分别是密度为 82 5丛· hm-2 林分的 1.8倍和 2 .2 4倍 ;另外 ,林分主要养分元素的年流失量也与其密度呈负相关 ,密度为 82 5丛· hm-2 林分的主要养分元素的年流失量为 :NO3-为 0 .10 7kg· hm-2 a-1,NH4 +为 0 .2 0 2 kg· hm-2 a-1,PO4 3-为 0 .0 57kg· hm-2a-1,K+为 1.781kg·hm-2 a-1。
The surface runoff of three plantations of Dendrocalamus latiflorus Munro (82 5, 495, 330 plex · hm-2), respectively, for 4 years was observed and analyzed comprehensively. The results showed that: The maximum amount of precipitation without surface runoff was 3 ~ 5mm / second. The surface runoff and sediment loss were positively correlated with the precipitation. The surface runoff was negatively correlated with the precipitation interval and stand density. The average annual surface runoff and soil erosion modulus of the 330 plex · hm-2 forest were 38.1 mm and 16.0 t · km-2 a-1, respectively, which were 1.8 times of the 82 5 plex · hm-2 stand And 2.24 times respectively. In addition, the annual loss of major nutrient elements in the stand was also negatively correlated with its density. The annual loss of the main nutrient elements at the density of 82 5 plex · hm-2 was NO3- .10 7 kg · hm-2 a-1, NH4 + was 0.220 kg · hm-2 a-1, PO4 3- was 0.057 kg · hm-2a-1 and K + was 1.781 kg · hm- 2 a-1.