黄土丘陵区不同土地利用方式下土壤水分变化特征
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山西大学黄土高原研究所

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青年科学基金项目(41301609)


Water characteristics of soil under different land-use types in the Loess Plateau region
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    摘要:

    选择黄土丘陵区砖窑沟流域不同土地利用方式为研究对象,在2016年6月至11月对0-300 cm土层土壤含水量进行监测,分析刺槐林、草地、柠条灌木林、小叶杨林、海红林和撂荒地6种土地利用方式下土壤含水量的垂直剖面分布特征、土壤贮水量的季节变异特征。结果表明:(1)土壤含水量随深度的变化自上而下均呈"S"状分布,随着土层深度的增加,土壤含水量呈先增加后减小的趋势,具有明显的垂直变异特征。(2)不同土地利用方式具有不同的土壤湿度剖面,土壤水分活跃层、次活跃层、相对稳定层的深度范围不同。(3)6种土地利用方式下各土层的土壤贮水量均具有明显的季节变化特征,海红林的土壤贮水量最大,为258.21 mm,然后依次为小叶杨林、撂荒地、草地和刺槐林,柠条灌木林样地最小;监测期内土壤贮水量随时间呈增长趋势,在11月达到最大值。土壤含水量的变异系数均随着土层深度的增加逐渐递减,在100 cm以下土壤深层季节变异趋于稳定。研究认为,乔灌林消耗更多深层的土壤水分,柠条灌木林易引起土壤干燥化,海红林的土壤水分条件较好,撂荒地和草地土壤水分条件相对稳定。

    Abstract:

    This study investigated the effect of different land use types upon soil water content in the Loess Plateau region, China. The water of soil from different land-use types was examined from the depth of 0-300 cm at 20 cm intervals from June to November 2016. The temporal distribution characteristics of soil water content and seasonal variation of soil water storage capacity of six land-use types were analyzed. Those different land-use types included the growth of Robinia pseudoacacia L., Caragana korshinskii Kom., Populus simonii Carr., or Malus micromalus Makino, and grassland or abandoned land. The results showed that:(1) The soil water content increased at first, and then decreased with the depth of the soil.(2) The depth range of the active layer, the secondary active layer and the relatively stable layer of the soil in different land-use types was different.(3) The water storage capacity of each soil layer under the six land use types had obvious seasonal variation. The highest soil water storage capacity of the six land use types was 258.21 mm, which was M. micromalus Makino, followed by P. simonii Carr., abandoned land, grassland and R. pseudoacacia L. The soil water storage capacity of C. korshinskii Kom. was the lowest. During the monitoring period, soil water storage generally increased, and it reached the maximum in November. The coefficient of variation of soil water content gradually decreased with the depth of soil layer. At a depth of 100 cm, the coefficient of variation of soil water content was stable. The results showed that trees and shrubs consumed more deep soil water, and C. korshinskii Kom. may lead to soil desiccation. M. micromalus Makino had a fine soil water condition. The soil water condition of abandoned land and grassland is relatively stable.

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马婧怡,贾宁凤,程曼.黄土丘陵区不同土地利用方式下土壤水分变化特征.生态学报,2018,38(10):3471~3481

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