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以柠条为对象,采用中子水分仪对黄土丘陵半干旱区人工植被恢复过程中土壤水分与植物生长进行长期定位观测.结果表明:撂荒地播种后,随着时间推移,植物群落保持水土能力增强,根系吸收利用水分的土层深度增加、土壤含水量下降.林地土壤出现干层,且干层土壤的深度和厚度逐年增加.植物对土壤水资源的利用限度为干层土壤深度等于最大补给深度时的土壤储水量.在黄土丘陵半干旱区人工柠条林地土壤水资源利用限度是0～290cm土层的土壤储水量为249.4mm.当人工林地土壤水资源接近或等于土壤水资源利用限度时,需要采取措施降低土壤水分消耗,或增加土壤水分补给,维持根系吸收利用水资源的相对稳定.
Using Caragana korshinskii as object, the long-term orientation of soil moisture and plant growth during artificial vegetation restoration in semi-arid loess hilly region was measured by neutron moisture analyzer.The results showed that after sowing land, the plant community maintained soil and water abilities The depth of soil layer in soil increased and the soil moisture content decreased.The dry soil layer appeared in forest soil and the depth and thickness of dry soil layer increased year by year.The limit of soil water use by plant was that dry soil depth was equal to the maximum recharge Depth of soil water storage in the Loess Plateau semi-arid artificial C. fortunei soil water use limits of 0 ~ 290cm soil layer of soil water storage was 249.4mm.When the plantation soil water resources close to or equal to the limits of soil water use When it is necessary to take measures to reduce soil water consumption, or increase soil moisture replenishment, to maintain the relative stability of the root system to absorb water resources.