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作 者 ：张北赢,徐学选,刘文兆,杜峰

期 刊 ：生态学报 2008年 28卷 1期 页码：361~366

关键词：黄土丘陵区；土壤水分；灰关联分析；

Keywords:Loess hilly region, Soil moisture, Grey relational analysis,

摘 要 ：运用灰色关联度分析法，分析了黄土丘陵区的延安燕沟不同土地利用方式下土壤水分的垂直变化和月动态。结果表明：梯田各层土壤水分变化态势相似程度较高，即梯田土壤水分的垂直波动较小；不同土地利用方式下均是表层（0～30cm）和中层（30～100cm）土壤水分的灰关联度较大，即土壤水分的变化发展态势较一致，但由于不同利用方式的影响，土壤水分变化态势的相似程度为梯田＞白羊草＞刺槐＞沙棘，除白羊草地外，其他土地利用方式下表层（0～30cm）与深层（100～200）的灰关联度最小，土壤水分变化差异较大。从各月土壤水分灰关联度来看，沙棘除10月份外，其他各月土壤水分变化态势的相似程度较高；白羊草地正好相反，整个生长季土壤水分的变化波动很大；梯田和刺槐林地居中，但各月土壤水分变化态势的相似程度仍然存在差异，表现为雨季前各月土壤水分变化较为一致，雨季后的9、10月份与4月份相比差异较大。说明不同的土地利用方式对土壤水分的垂直变化和月动态变化均产生不同影响。

Abstract:Based on the data collected by random survey of soil moisture in the Loess Hilly Region, the authors analyzed the dynamic characteristics of soil moisture under different landuses. The result showed that landuses made soil moisture in vertical layer quite different. In terrace land, the variational trend of soil moisture in different layers was accordant, that is, the fluctuation of soil moisture in vertical layer was little. Under different landuses, the variation of soil moisture between surface layer (0-30cm) and middle layer (30-100cm) was accordant, and landuse, in terms of the accordant degree, ranks in the descendant order of terrace land, pasture land, forestland, and shrub land. Except pasture land, the grey relational grade of the landuses between surface layer (0-30cm) and deep layer (100-200cm) was least, which means that soil moisture varied remarkably. The grey relational grade of soil moisture in each month was different. In shrub land, except December, the variational trend of soil moisture was similar. By contraries, grass land had the different trend, and the fluctuation of soil moisture in growth season was great. It can be seen that the different landuses resulted in the difference of dynamic characteristics of soil moisture.

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