晋西北黄土丘陵区不同林龄柠条地土壤水分变化特征研究

Study on the characteristics of the soil moisture variation in different-aged Caragana korshinskii Kom in Loess hilly region,northwestern Shanxi

以山西省五寨县张家坪林场三个林龄的柠条林为研究对象,以撂荒地为对照,分别对其0-600cm土壤剖面的水分含量进行了测定分析。结果表明:(1)在0-600cm土层中,土壤水分含量除10a柠条林与撂荒地间没有明显差异外,其它各林龄柠条林之间均存在显著差异(p<0.05),总体表现为,撂荒地>10a柠条林>20a柠条林>35a柠条林;(2)在0-600cm土层中,各林龄柠条林与撂荒地土壤水分含量均表现随着土层深度的增加呈现先减少后增加的趋势,并以200-300cm深度处作为临界低点,在不同林地表现不同的垂直分布特征;(3)不同林龄柠条林地土壤干层分布深度不同,且随着林龄的增大,中度干层的深度及范围也在逐渐增大。因此根据本区域土壤水分变化特点,在进行植被恢复建设过程中,应选择适宜的植物配置模式及营林管理模式,以减少本区域内土壤水分的过度消耗。

In order to explore the influence of plantation period towards the soil moisture in Loess hilly region in northwestern Shanxi, three different -aged Caragana in Zhang Jiaping timber land in Wuzhai county were chosen as the research object and compared with the uncultivated land. We measured and analyzed the moisture content of 0 - 600cm soil profile respectively. The results showed that ： （ 1 ） Among 0 - 600em soil layer, besides the insignificant difference between 10a Caragana and the uncultivated land, there were significant differences of soil moisture content among the three different -aged Caragana（ p 〈0.05 ）, with the expressions as follows： uncultivated land 〉 10a Caragana 〉 20a Caragana 〉 35a Caragana. （2）The soil moisture contents of different -aged Caragana and the uncultivated land in 0 -200,300cm decreased with the increase of soil depth while manifested opposite in 300 - 600cm depth. As a result, there appeared different spatial distribution patterns in different forest land; （3）The dried soil layer distributed diversely with different - aged Caragana, and the depth and range of moderate dry layer increased accordingly. So in reforestation, we should select appropriate plant configuration mode and forest management, taking soil moisture variation in certain region into consideration, to reduce the moisture consumption.