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以内蒙古河套灌区解放闸灌域112个取样点448个土壤样本为基础,结合经典统计学与地统计学理论,对灌域内土壤质地及各粒级含量在不同土层(0~20cm、20~40cm、40~70cm与70~100cm)的空间变异性及空间分布规律进行研究。结果显示,利用地统计学方法进行最佳半方差函数拟合发现,除了0~20cm、20~40cm分布的粘粒为中等空间相关性,均为强烈空间相关性,说明各粒径的空间变异性主要是由其结构性因素决定的,随机性因素对该尺度下变量的空间变异性影响较小。灌域的土壤质地以壤土类为主,所占面积达到90%以上,且随着深度的增加,粘壤土类所占比例有增大的趋势,砂土类所占比例较小,在4.5%~6%之间,整体上从灌域上游到下游沿着总排干土壤质地由砂土类向粘壤土类递变。
Based on the statistics of 448 soil samples from 112 sampling points in Jiefang gate irrigation area of Hetao irrigation district in Inner Mongolia, the soil texture and the content of each grain size in different soil layers (0 ~ 20cm, 20 ~ 40cm, 40 ~ 70cm and 70 ~ 100cm) spatial variability and spatial distribution of the law. The results showed that the best semi-variance function fitting using geostatistics method found that except the 0 ~ 20cm, 20 ~ 40cm distribution of the cosmids for the medium spatial correlation, are strongly spatial correlation, indicating the spatial variability of each particle size Sex is mainly determined by its structural factors. The randomness has little effect on the spatial variability of variables under this scale. The soil texture of the irrigated area is dominated by loamy soil, accounting for more than 90% of the total area. With the increase of depth, the proportion of viscous loamy soil tends to increase, while that of sandy soil accounts for a small proportion of 4.5% ~ 6%, as a whole, from the upper reaches to the lower reaches of the irrigation area, the total drainage soil texture changed from sandy soil to loamy soil and loamy soil.