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以甘肃省兰州市孙家岔流域为研究对象,利用1981—1983年、2011年的实测土壤水分资料,采用地质统计法分析了该流域土壤水分的垂向变异特征。结果表明,球状模型对丰水年和平水年不同土地利用(梯田和荒坡)土壤水分垂向分布的变异函数拟合,经F值检验后为显著水平。在枯水年,球状模型对梯田的实验变异函数依旧拟合较好,而荒坡在枯水年二次线性模型对土壤水分垂向分布拟合较好,对枯水年雨季分析,发现土壤水分的时空间自相关也很弱。半干旱黄土区土壤水分垂向变异性的研究,可对该区不同土地利用的蓄水特征和土地规划利用提供一定的理论依据。
Taking Sunjiacha Basin of Lanzhou City, Gansu Province as the research object, the vertical variation characteristics of soil moisture in this basin were analyzed by using geostatistical method from 1981 to 1983 and 2011 measured soil moisture data. The results showed that the spherical model fitted the variation function of vertical distribution of soil moisture in different land use (terraced fields and barren slopes) in Fengshui years and peace years, and was significant after F value test. In the dry year, the spherical model fitted well to the experimental variation of terraced fields, while the quadratic linear model of the barren slope fitted well to the vertical distribution of soil moisture in dry season, Water is also weakly correlated in time and space. The study on the vertical variability of soil moisture in semi-arid loess area can provide some theoretical basis for the characteristics of water storage and land use for different land use in this area.