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以江西大岗山地区杉木林、常绿阔叶林和毛竹林为研究对象,分析其对降水再分配过程的影响.结果表明:2012年4—6月,研究区降水量为531.6 mm,以小到中雨为主,单次最大降雨量为61.7 mm.研究期间,毛竹林总穿透雨量最大,常绿阔叶林最小.降水量相同条件下,毛竹林与杉木林的穿透雨量相差不大;降水量较大且相同时,常绿阔叶林的穿透雨量明显小于另外两种林型;穿透雨在林内有明显的空间变异性.杉木林、常绿阔叶林和毛竹林的树干径流率分别为1.4%、8.9%和8.8%.杉木林树干径流与另外两种林型差异极显著(P<0.01).3种林型树干径流量均与前期降水条件有关,毛竹林相关程度最小,杉木林最大.3种林型林冠截留量大小依次为杉木林(30.5%)>阔叶林(25.5%)>毛竹林(19.2%).在该地区常见降雨条件下(小雨),杉木林截留率明显高于另外两种林型.
The effects of the Chinese fir plantation, the evergreen broad-leaved plantation and the Phyllostachys pubescens plantation in the Dagangshan area of Jiangxi Province on the precipitation redistribution process were analyzed.The results show that from April to June in 2012, the precipitation in the study area is 531.6 mm, Small to medium rain, the maximum single rainfall was 61.7 mm. During the study period, the total penetrating rain of moso bamboo forest was the largest and the evergreen broad-leaved forest was the smallest. Under the same precipitation condition, the penetrating rainfall of Moso-bamboo forest and Chinese fir forest were different The precipitation of evergreen broad-leaved forest was significantly less than that of the other two types of forest when the precipitation was large and the same. The penetrating rain had obvious spatial variability in the forest. The trunk runoff rates of bamboo forests were 1.4%, 8.9% and 8.8%, respectively.The trunk runoff of Chinese fir forest was significantly different from that of the other two forest types (P <0.01) .The runoff of the three forest types was related to the precipitation at the early stage, Bamboo forest had the least degree of correlation and the largest was Chinese fir forest.The canopy interception of the three kinds of forest followed by Chinese fir forest (30.5%), broadleaf forest (25.5%) and bamboo forest (19.2%), ), Cunninghamia lanceolata forest retention rate was significantly higher than the other two forest types.