黄土高原半干旱丘陵沟壑区人工林土壤水分动态研究

通过对黄土高原半干旱丘陵沟壑区的人工油松(Pinus tabulaeformis)、樟子松(Pinus sylvestris var.mongolica)、柠条(Caragana microPhylla)林地土壤水分动态分析,结果表明,油松、樟子松、柠条林地土壤水分亏缺很大,柠条尤为突出,生长季平均土壤含水量为4.53,水分亏缺1 299mm,油松、樟子松水分亏缺约1 220 mm.在季节变化上,柠条林地土壤含水量最高值出现在生长季以前,油松、樟子松林地土壤含水量最高值则出现在6、7月份,在生长季末各林地

Soil Water Dynamics of Plantations in Sub-arid Gully and Hilly Regions of the Loess Plateau

The dynamics of soil water in Pinus tabulaeformis, P. sylvestris var. mongolic and Caragana microphylla plantations in Pianguan county, Shanxi Province, were studied from May to December 2002. The results indicated that the deficit of soil water of P. tabulaeformis, P. sylvestris var.mongolic and C. microphylla was enormous, and that of C. microphylla was particularly outstanding. During the growing season, the average soil water was only 4.53%, the deficit of soil water was 1 299 mm, P. tabulaeformis and P. sylvestris var.mongollia close to 1 220 mm respectvely. As to seasonal variation, in the plantation of C. microphylla, the time of the maximum of soil water appeared before the growing season, but in those of P. tabulaeformis and P. sylvestris var.mongolic , the time was June or July. The stored water of the plantations was all decreased at the end of the growing season compared with that at the beginning, P. tabulaeformis, P. sylvestris var. mongolic and C. microphylla decreased by 17 mm, 8 mm and 73 mm respectively. More water was consumed by C. microphylly than by P. tabulaeformis and P. sylvestris var.mongolic. In vertical change, the law of the utilization of soil water was basically similar, the soil water condition could be divided into three layers: weak absorbing layer, absorb layer and regulating layer. There were obvious soil drying-layers in different sites.