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运用地统计学和GIS相结合的方法,研究了黄土丘陵区县域不同地貌单元土壤有机碳空间变异的尺度效应,尺度划分为县域、县域上三种不同的地貌单元以及与地貌单元相对应的乡镇尺度,结果表明:①各个尺度下有机碳含量均偏低,完整地貌单元尺度与乡镇尺度有机碳均值与变异系数大小顺序不同;②高山区随着尺度的变化,自然因素对变异的影响程度没有显著变化,但低山丘陵区与丘陵沟壑区自然因素的影响程度减小,插值图表现出较小的研究面积有机碳含量信息更丰富;③县域尺度上海拔与土壤类型是导致变异的主控因素,在丘陵沟壑区,所研究的自然因素(海拔、土壤类型、土壤侵蚀程度、田面坡度、坡向)对其影响都不显著;在低山丘陵区,地貌单元上主控因子是海拔与土壤类型,而乡镇尺度上转化为田面坡度;在高山区,地貌单元上主控因子是土壤类型,但乡镇尺度上其主要影响因素变为土壤侵蚀程度。
By using the combination of geostatistics and GIS, the scale effect of spatial variability of soil organic carbon in different landform units in the loess hilly region was studied. The scale was divided into three different landform units in the county and county areas and the townships corresponding to the landform units The results show that: (1) the content of organic carbon in each scale is low, and the order of the unit cell size of complete landform and that of township and town is different from that of the coefficient of variation; (2) the influence of natural factors on the variation But the degree of influence of natural factors in hilly and hilly areas was reduced. Interpolation maps showed that there was richer information of organic carbon content in the smaller study area. (3) Elevation and soil types were the main controlling variables in the county scale In the hilly region, the natural factors (elevation, soil type, degree of soil erosion, surface slope, slope direction) had no significant effect on them. In the hilly region, the main controlling factors of the topographic units were elevation and Soil type, and township scale conversion into the field slope; in the mountainous area, the main control factor on the topography unit is the soil type, but the township ruler The main influencing factors on changes to the extent of soil erosion.