内蒙古温带草地土壤有机碳组分含量和分解速率的空间格局及其影响因素

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陈颖洁¹^,², 房凯²^,³^,^*(

), 秦书琪², 郭彦军¹^,⁴, 杨元合²^,⁵

Spatial patterns and determinants of soil organic carbon component contents and decomposition rate in temperate grasslands of Nei Mongol, China

CHEN Ying-Jie¹^,², FANG Kai²^,³^,^*(

), QIN Shu-Qi², GUO Yan-Jun¹^,⁴, YANG Yuan-He²^,⁵

图4. 内蒙古温带草地土壤有机碳含量、碳组分含量、碳分解速率与气候、土壤、植物和矿物变量的相关性。土壤有机碳、大团聚体碳、微团聚体碳、粉粒黏粒碳含量和有机碳标准化的碳分解速率数据经过了lg转化。括号中的“+”和“-”分别代表正相关关系和负相关关系。AGB, 地上生物量; AI, 干旱指数; Ca_Exch, 交换性钙; Clay + silt, 黏粒和粉粒含量; Fe_o + Al_o, 弱结晶态铁铝氧化物; Fe_p + Al_p, 有机络合态铁铝氧化物; MAP, 年降水量; MAT, 年平均气温。*, p < 0.05; **, p < 0.01; ***, p < 0.001。

Fig. 4. Correlations of total soil organic carbon (C) content, C content in different aggregate fractions and C decomposition rate with climatic, edaphic, plant and mineral variables in temperate grasslands of Nei Mongol. Soil organic C, macroaggregate C, microaggregate C, silt and clay C, and C decomposition rate standardized by SOC are lg transformed. The “+” and “-” in parentheses represent positive and negative correlations, respectively. AGB, aboveground biomass; AI, aridity index; Ca_Exch, exchangeable Ca²⁺; Clay + silt, clay and silt content; Fe_o + Al_o, poorly crystalline Fe/Al oxide; Fe_p + Al_p, organically complexed Fe/Al oxide; MAP, mean annual precipitation; MAT, mean annual air temperature. *, p < 0.05; **, p < 0.01; ***, p < 0.001.