图6. 环境因子组合对荒漠草原土壤呼吸速率的方差分解。小于0的数值未显示。单个圆圈内数字代表该环境因子组合能解释的方差。圆圈重合部分内数字代表几个环境因子组合共同解释的方差。X1组包括土壤温度、含水量、pH、有机碳、硝态氮和铵态氮含量。X2组包括土壤蔗糖酶活性和微生物生物量碳、氮、磷含量。X3组包括Shannon-Wiener多样性指数和Pielou均匀度指数。

Fig. 6. Variation partitioning of soil respiration rate by environmental factor groups in a desert steppe. Values < 0 are not shown. Data in one circle represent the variation individually explained by the environmental factor groups. Data in the overlapped part of circles represent the variation jointly explained by environmental factor groups. X1 group includes soil temperature, water content, pH, organic carbon, nitrate nitrogen, and ammonium nitrogen content. X2 group includes soil sucrase activity and microbial biomass carbon, nitrogen, phosphorus content. X3 group includes Shannon-Wiener diversity index and Pielou evenness index.