论文部分内容阅读
【目的】以伊犁昭苏草原黑钙土为对象,研究分析草原黑钙土有机碳含量、储量及密度的垂直分布特征及空间变异性。【方法】采用重铬酸钾-外加热法,测定不同海拔高度0~100 cm土层土壤有机碳含量,研究土壤有机碳储量与密度等在不同海拔高度和土层厚度上的空间变异性。【结果】伊犁昭苏草原黑钙土有机碳含量、碳储量和碳密度不仅随着海拔高度的升高而降低,而且也随土层厚度的增加呈降低趋势。研究区100 cm处有机碳含量、储量和密度在海拔1 000~3 000 m分别为64.70~616.79 g/kg、4.49×10~(-8)~1.94×10~(-6)Pg/hm~2、3.26~194.27 kg/m~2。典型草原黑钙土土壤有机碳含量、储量和密度与海拔高度呈显著负相关(r=-0.92,-0.943,-0.95),与土层厚度呈极显著负相关(r=-0.989**,-0.968**,-0.966**)。【结论】伊犁昭苏草原黑钙土有机碳含量、储量与密度随着海拔高度的升高与剖面深度的增加而降低。
【Objective】 The objective of this study was to investigate the vertical distribution and spatial variability of organic carbon content, reserves and density in the steppe chernozem soil in Yili, Shaanxi Province. 【Method】 Soil organic carbon in 0-100 cm soil layers was measured by potassium dichromate-external heating method. The spatial variability of soil organic carbon storage and density at different altitudes and soil thicknesses was studied. 【Result】 The results showed that the organic carbon content, carbon storage and carbon density of Chernozem in Zhaosu steppe, Yili, not only decreased with the increase of altitude, but also decreased with the increase of soil thickness. The organic carbon content at 100 cm in the study area was 64.70 ~ 616.79 g / kg and 4.49 × 10 -8 ~ 1.94 × 10 -6 Pg / hm ~ 2,3.26 ~ 194.27 kg / m ~ 2. There was a significant negative correlation between soil organic carbon content, storage and densities and altitude in typical steppe chernozem (r = -0.92, -0.943, -0.95), and negatively correlated with soil thickness (r = -0.989 **, -0.968 **, -0.966 **). 【Conclusion】 The organic carbon content, reserves and density of Chernozem in Zhaosu steppe of Ili grassland decreased with the increase of altitude and depth of profile.