摘要
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。
WT5BZ]After four year setling observing and comprehensive analysis of three kinds of Dendrocalamus latiflorus Munro with 825,495,300 hm 2 respectively,results show that the biggest raining amount is 3～5mm/time without earth surface stream; the earth surface stream relates to the losing amount of mud and sand in a positive line,but to the break time of raining and density of forestry in a negative line.The average earth surface stream and soil erosion model numnor of the forestry with the density of 330 hm 2 are 38.1 mm and 16.0 t·km -2 a -1 ,which is 1.8 and 2.24 times of the forestry with the density of 875 hm 2.In addition,hutrients’s losing amount shows negative relationship to its density.The yearly losing amount is that NO - 3,0.107kg·hm -2 a -1 ;NH + 4,0.202 kg·hm -2 a -1 ;PO 3 4,0.057 kg·hm -2 a -1 ,K + 1.781 kg·hm -2 a -1 .
出处
《竹子研究汇刊》
北大核心
2000年第4期18-25,共8页
Journal of Bamboo Research
关键词
丛生竹
麻竹人工林
地表径流
水文效应
生态系统
Big cluster bamboo
Dendrocalamus latiflorus Munro
Man made forest
Earth surface stream
Water ettects
