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根据典型砒砂岩区内蒙古鄂尔多斯准格尔旗境内植有沙棘柔性坝的东一支沟道与无任何植物的对比沟道的表层(0-30cm)土壤含水量数据,运用地统计学方法分析与探讨了沙棘对砒砂岩区小流域沟道土壤水分小尺度空间变异的影响。结果表明:沙棘可明显提高砒砂岩区小流域沟道土壤含水量;沙棘柔性坝沟道与对比沟道土壤含水量具有明显的空间变异特征,沙棘柔性坝沟道土壤含水量在1-6m变程内具有中等程度的空间自相关性,对比沟土壤含水量在1-5m变程内具有较高的空间自相关性;土壤含水量分数维值表明,沙棘柔性坝沟道土壤含水量的空间依赖性比对比沟的要弱些;沙棘对小尺度土壤水分空间分布格局及其异质性有显著影响。应当指出的是,虽然降雨是土壤含水量空间自相关与分布格局影响的主要因素,但干旱条件也不容忽视,在长时间地表蒸发及植物蒸腾作用下,沟床表层土壤含水量空间变异性会进一步加强,且在一定程度上会影响沟床表层短根系及一年生草本植物的生长与分布。
According to the data of soil moisture of the surface layer (0-30cm) of the east channel of the seabuckthorn flexible dam and the no-plant channel in Junggar Banner, Inner Mongolia Ordos, Inner Mongolia, the geo- The effects of seabuckthorn on the small-scale spatial variability of soil moisture in the channel of small watershed in 砒 sandstone area were discussed. The results showed that seabuckthorn could significantly improve the soil moisture content in the watershed of the 砒 sandstone region. The soil moisture content of the seabuckthorn flexible dam and the contrast channel had obvious spatial variation. The soil water content of the seabuckthorn flexible dam was between 1-6m There was a moderate spatial autocorrelation in the course of the experiment. The spatial autocorrelation of the soil moisture content in the range of 1-5 m was relatively high compared with that of the control soil. The fractal dimension of soil moisture content showed that the space of soil moisture Dependency is weaker than that of contrast ditch; Seabuckthorn has a significant effect on the spatial distribution pattern and heterogeneity of soil moisture on small scale. It should be pointed out that although rainfall is the major factor influencing the spatial autocorrelation and distribution pattern of soil moisture content, the condition of drought can not be ignored. Under long-term surface evaporation and plant transpiration, the spatial variability of surface soil moisture content Further strengthening, and to a certain extent, will affect the growth of the short root system of surface ditch beds and annual herbaceous plant growth and distribution.