天山北坡中段土壤有机碳含量的空间分异

Soil Organic Carbon Content's Spatial Differentiation in the Northern Slope of Tianshan Mountainous

[目的]研究天山北坡中段土壤有机碳含量的空间分异。[方法]通过对天山北坡中段海拔1 200~1 900 m的垂直带内进行系统采样和实验室测试,分析该地区土壤有机碳含量的空间分异和分布特征。[结果]土壤有机碳含量与海拔存在显著正回归关系,在0~100 cm土层内,土壤有机碳含量表现为荒漠草原<耕地<山地草原<山地森林;天山北坡的荒漠草原、山地草原、山地森林和耕地内,土壤有机碳含量在剖面垂直分异明显,随深度增加呈幂函数递减趋势,下降速率表现为山地森林<山地草原<荒漠草原<耕地;Co Kriging插值比单因素Kriging插值拟合精度更高,更好地反映出研究区土壤有机碳含量的空间分布情况;土壤有机碳的空间分异与地理空间的水热组合条件、生长植被类型、群落植物生物量分配模式以及人为扰动有关。[结论]该研究为天山生态系统固碳功能评估和土地资源管理和利用提供科学依据。

[ Objective ] To study soil organic carbon content＇ s spatial differentiation in the northern slope of Tianshan Mountainous. [ Method ] The soil organic carbon content＇ s spatial differentiation was analyzed through sampling and laborature testing of vertical zone in the northern slope of Tianshan Mountains at an altitude of 1 200-1 900 m. [ Result] There was a significant positive regression relationship between soil or- ganic carbon and altitude, and soil organic carbon content in 0-100 cm soil layer showed desert steppe〈cultivated land〈 mountain steppe 〈 mountain thirst;the soil organic carbon content in the desert steppe, mountain steppe, mountain forest and cultivated land on the northern slope of the Tianshan Mountains was significantly different from that in the vertical section, and decreased with the increase of the depth. The rate of decline showed mountain thirst 〈 mountain steppe 〈 desert steppe 〈 cultivated land; CoKriging interpolation was more accurate than single taetor Kriging interpolation, which better refleeted the spatial distribution of soil organic carbon in the study area ; the spatial variation of soil organic carbon was related to the combination of water and heat conditions, vegetation types, plant biomass allocation patterns and hmnan disturbanee. [ Conclusion] The results can provide scientific data for the assessment of carbon sequestration tunetion and the management and utilization of land resoures in the ecological system of Tianshan Mountains.