土壤水资源利用限度评价  

Evaluating Use Limit of Soil Water Resources

作　　者：张小萍[1] 郭忠升[2,3] 郭满才[1] 

机构地区：[1]西北农林科技大学理学院,陕西杨凌712100 [2]西北农林科技大学水土保持研究所,陕西杨凌712100 [3]中国科学院/水利部水土保持研究所,陕西杨凌712100

出　　处：《湖北农业科学》2015年第4期769-772,共4页Hubei Agricultural Sciences

基　　金：国家自然科学基金项目(41271539)

摘　　要：在水资源紧缺地区,大部分地区的土壤水分主要来源于天然降雨,随着人工林生长,林地土壤水资源下降,当人工林发展到超过植物对土壤水资源的利用限度时,在林地最大土壤水分补给深度以下出现的土壤层将会成为不可逆转的土壤干层。这种现象不利于土壤水资源的可持续利用和森林植被的恢复、更新。土壤水资源利用限度理论的提出将使不可逆转的土壤退化防治变为积极的土壤水资源的可持续利用。在生产中应充分认识并掌握这个规律,设法避免人工林草植被对土壤水资源的过度利用。Soil water in most areas is mainly from natural rainfall in the area of water shortage. Soil water of forest will de- crease with the growth of plantations. When the plantation grows to a certain stage in which the soil water used by plants ex- ceeds the limits of soil water, Irreversible soil dry layer below depth of the maximum soil water recharging in the forest ap- pears. This phenomenon is not conducive to sustainable use of soil water resources and restoration and updating of forest veg- etation. The theory of soil water use limit was put forward to control irreversible soil degradation sustainablely use water re- sources. In the process of production and practice, we should fully understand and master this rule and avoid over-exploita- tion of plantation of grass vegetation and soil water resources.

关 键 词：土壤水资源 可持续利用 土壤干层 土壤水资源利用限度 

分 类 号：S152.75[农业科学—土壤学]