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为理解大尺度下土壤有机碳的空间分异特征,运用遥感与GIS技术,结合地统计学方法研究了三工河流域农业绿洲0~20 cm土层土壤有机碳的空间格局特征。结果表明:①流域尺度的土壤有机碳含量的理论变异函数符合球形模型,F检验达到极显著水平,在2~20 km的中尺度上具有中等强度的空间变异性和自相关性;②流域空间尺度上,土壤有机碳主要变化在4.5~6 g.kg-1和10.5~12 g.kg-1范围中,阜康绿洲区土壤有机碳含量明显要高于阜北绿洲区。土壤有机碳平均含量耕地最高,其次为草地,最低的为裸地。流域空间土壤有机碳储量为17.07×105t,单位面积土壤有机碳储量:阜康绿洲>全流域>阜北绿洲。
In order to understand the spatial heterogeneity of soil organic carbon under large-scale, the spatial pattern of soil organic carbon in 0 ~ 20 cm soil layer of agricultural oasis in Sangong River Basin was studied by using remote sensing and GIS technology combined with geostatistics. The results showed that: (1) The theoretical variation of soil organic carbon content in the basin scale accorded with the spherical model, and the F test reached the extremely significant level with moderate intensity spatial variability and autocorrelation at mesoscale 2 to 20 km; (2) On the scale, the main changes of soil organic carbon were in the range of 4.5-6 g.kg-1 and 10.5-12 g.kg-1. The content of soil organic carbon in Fukang oasis was significantly higher than that in Fu-bian oasis. The average content of soil organic carbon was the highest in cultivated land, followed by grassland, and the lowest was bare land. Soil organic carbon storage in the basin was 17.07 × 105t, organic carbon storage per unit area: Fukang Oasis> whole basin> Oasis in Fubei.