[关键词]
[摘要]
林分密度对森林生态功能有一定影响,以冀北山地不同密度油松人工林的植被层、枯落物层和土壤层为研究对象,对其水文效应进行了研究。结果表明:林冠截留能力随着林分密度的减小而减小,林下植被截留能力随着林分密度的减小而增大;林下枯落物最大持水量随着林分密度的减小而减小,其中林分密度分别为1584株?hm-2、864株?hm-2和684株?hm-2标准地枯落物最大持水量差距相对较小,分别是林分密度388株?hm-2标准地的1.56倍、1.50倍和1.42倍;388株?hm-2油松林枯落物有效拦蓄量较小,但其枯落物初期持水速率较大。土壤持水能力随着林分密度的减小表现出逐渐增大趋势,林分密度864株?hm-2、684株?hm-2和388株?hm-2标准地土壤持水能力分别为林分密度1584株?hm-2标准地的1.04倍、1.14倍、1.14倍,密度684株?hm-2和388株?hm-2标准地的土壤持水能力较为接近。对油松人工林进行合理抚育间伐,保留合适密度,能改善其涵养水源功能。
[Key word]
[Abstract]
Stand density imposed the large effects on forest hydrological effects. Based on vegetation layer, litter layer and soil layer of different intensities Pinus tabulaeformis plantation in mountainous area of north Hebei province, forest hydrological effects was studied. Results showed that: 1) canopy interception reduced with the decreasing intensity, but the undergrowth vegetation interception raised with the decreasing intensity, 2) litter water retention reduced with the decreasing intensity, litter water retentions of the three plots with stand density of 1584 trees?hm-2, 864 trees?hm-2 and 684 trees?hm-2 had smaller disparities, but accounted for 155.66%, 149.58% and 142.25% of the sample stand with 388 trees?hm-2 ; 3) soil water-holding ability raised with the increasing stand density, plots with stand density of 1584 trees?hm-2, 864 trees?hm-2 and 684 trees?hm-2 accounted for 103.79%, 113.88%, 114.02% of the sample stand with 1584 trees?hm-2. Soil-water storage capacity of sample 864 trees?hm-2 and 684 trees?hm-2 plot were close to each other. Pinus tabulaeformis platation thinning reasonably could improve forest water conservation.
[中图分类号]
[基金项目]
河北水利科研计划(2015-07)