不同间伐强度对杉木林土壤水分的影响

Impacts of changed the intensities of thinning on soil moisture in Cunninghamia lanceolata plantation

以绥宁县堡子岭林场无间伐、间伐强度20%和50%的杉木人工林为研究对象,对其0～110 cm土层的土壤含水量进行观测研究。结果表明:间伐对杉木人工林土壤水分有明显的影响;浅层土壤(0～15、15～30cm)水分的变化均表现为随间伐强度的增加土壤含水量降低;间伐降低土壤含水量的趋势从30～45 cm土壤层开始改变,且水分动态变化程度与间伐强度正相关;间伐对0～110 cm的平均土壤含水量的影响表现为间伐强度20%>无间伐>间伐强度50%。合理的间伐强度能够有效调节土壤水源涵养能力,为科学协调林水关系提供理论依据。

In order to examine the effects of various intensities(0%,20%,50%)of thinning on soil moisture in Chinese fir plantation,we conducted an experiment to measure the soil water content(SWC)of different layers(0~110 cm)of plantation soil in Baoziling State-owned Forestry Farm in Suining County of Hunan Province.The results demonstrated that:The SWC showed a negative response during the increasing intensities of thinning in surface soil(0~15,15~30 cm);A positive feedback of SWC on thinning intensity suggested in 30~45 cm layer of soil,and the similar results were found in deeper layers.The averages of SWC in different soil layers(0~110 cm)were carried out as 20%->0%->50%-intensity of thinning.The conclusion indicated that:The functionality of water conservation of soil which can efficiently regulated by scientific intensity of thinning.