摘要
以北京山区典型小流域为研究区域,以主要林分类型油松林分为研究对象,对其枯落物层的蓄积量及持水特性进行定量分析,结果表明:1)研究区油松林分枯落物层平均蓄积量为21.86t/hm^2,其中未分解层蓄积量7.04t/hm^2(32.20%),半分解层蓄积量14.82t/hm^2(67.80%),半分解层蓄积量明显高于未分解层;2)油松林分枯落物蓄积量受林分叶面积指数影响明显,随叶面积指数的增大而增加;3)枯落物持水过程表现为"迅速吸水—缓慢吸水—逐渐饱和"的过程,吸水速率随浸水时间的增加而减小,两者呈一定的幂函数关系(V=kt^n)。研究结果可为小流域森林经营管理及其涵养水源功能监测提供参考。
Banchengzi catchment was selected as the study area,and Pinus tabulaeformis was selected to investigate the stock volume and water-holding capacity of litter layers. The results showed that:( 1) the stock volume of Pinus tabulaeformis litters was 21. 86 t/hm^2,of which the volume of undecomposed litters was 7. 04 t/hm^2 and accounted for 32. 20%,the volume of half decomposition was 14. 82 t/hm^2 and accounted for 67. 80%,and indicated that the volume of undecomposed litters was larger than undecomposed litters;( 2) litters volume was significant with leaf area index( LAI),and increased with larger LAI;( 3) the water holding of litters showed a process of"rapid absorption-slow absorption-gradual saturation",the absorption rate decreased with immersion time,and showed a power function relationship( V =ktn). The research results can provide references for forest management and water holding monitoring process in catchments.
出处
《林业资源管理》
北大核心
2018年第1期44-49,共6页
Forest Resources Management
基金
国家林业局项目"湿地景观生态规划关键技术研究"(201404308)
关键词
半城子流域
油松
枯落物
蓄积量
持水特征
Banchengzi catchment
Pinus tabulaeformis
litters
stock volume
water holding characteristics
