摘要
于2006年7～8月通过对京西百花山区6种植物群落凋落物的不同分解层次的蓄积量、自然含水率、最大持水率、吸水速度以及有效拦蓄水量进行测定。研究结果表明：凋落物蓄积量油松（Pinus tabulaef ormis）群落最高达到18.5 t/hm^2,杂类草凋落物最低只有3.9 t/hm^2,同一植物群落凋落物不同层次蓄积量未分解层低于半分解层,自然含水率未分解层低于半分解层,不同层次自然含水率差值最大的青杨（Populuscathayana）凋落物差值为97.1%;同一植物群落凋落物不同层次持水能力,半分解层高于未分解层,从中证明凋落物的持水能力与其分解程度有关;研究结果还表明,所有的凋落物按其吸水速度的快慢都可将其吸水过程分为3个阶段：快速吸水阶段（0～1.0 h）、缓慢吸水阶段（1.0～5.0 h）、停滞吸水阶段（24.0 h）;不同植物群落凋落物层对降雨的有效拦蓄量由高到低的排列顺序依次为青杨〉刺槐〉油松〉野艾蒿〉荆条〉杂类草,相关分析得出凋落物对降雨的有效拦蓄量与凋落物蓄积量、最大持水率成正相关关系,特别是与最大持水率相关系数（0.839 6）达极显蓍水平。
Though measured stock,natural moisture rate,max water-holding rate,moisture absorbing speed and effective holding-capacity of different litter layers in six communities in Baihua mountainous areas of west Beijing from Jul.to Aug.in 2006.The results showed that,the highest stock was Pinus tabulaeformis＇s litter about 18.5 t/hm^2,the lowest was litter of forbs about 3.9 t/hm^2,stock of different litter layers,semi-decomposed litter was higher than un-decomposed litter,natural moisture rate of the different decomposed layers in same communities,semi-decomposed litter was higher than un-decomposed litter layers,the highest one Populus cathayana＇s difference was 97.1%;Semi-decomposed litter was higher than un-decomposed litter layers of water-holding capacity,it could indicate water-holding ability was relational to the decomposed degree;According to the moisture absorbing speed of litter,it could separate the process to three parts,included fast process（0～1.0 h）,slow process（1.0～5.0 h）,stagnant process（24.0 h）;The experiments indicated that effective holding-capacity to rainfall of litter layers,in the declined order of Populus cathayana,Robinia pseudoacacia,Pinus tabulaeformis,Artemisia lavandulaefolia,Vitex negundo,forbs,linear correlation analysis revealed that effective holding-capacity to rainfall of litter layers and stock,max water-holding rate showed positive correlation,especially it with max water-holding rate had significant correlation（n=6,r=0.8396,P〈0.002）.
出处
《水土保持学报》
CSCD
北大核心
2007年第6期179-182,共4页
Journal of Soil and Water Conservation
基金
北京市科学技术委员会项目(D0605046040191)
关键词
京西百花山区
蓄积量
持水能力
有效拦蓄量
Baihua mountainous areas
stock
water-holding capacity
effective holdingcapacity
