中国森林生态系统土壤呼吸温度敏感性空间变异特征及影响因素

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郑甲佳¹^,², 黄松宇¹^,², 贾昕¹^,²^,³^,^*(

), 田赟¹^,³, 牟钰¹^,², 刘鹏¹^,², 查天山¹^,²^,³

Spatial variation and controlling factors of temperature sensitivity of soil respiration in forest ecosystems across China

ZHENG Jia-Jia¹^,², HUANG Song-Yu¹^,², JIA Xin¹^,²^,³^,^*(

), TIAN Yun¹^,³, MU Yu¹^,², LIU Peng¹^,², ZHA Tian-Shan¹^,²^,³

图5. 气候因素和土壤因素对土壤呼吸温度敏感性(Q₁₀)空间变异影响的结构方程模型(A)和标准化总效应(B)。
箭头旁边的数字是标准化路径系数γ, 实线箭头和虚线箭头分别代表模型中的正负效应。模型中所有路径均是显著的(p < 0.01), R²(粗体数字)表示有关变量的共同解释度, χ² = 1.39, df = 1, p = 0.24, RMSEA = 0.032。

Fig. 5. Structural equation model (A) and standardized total effect (B) of the effect of climatic and soil factors on spatial variation in the temperature sensitivity of soil respiration (Q₁₀).
Numbers beside arrows are standardized path coefficients (γ), the solid and dashed arrows represent the positive and negative effects in a fitted structural equation model, respectively. All paths in this model are significant (p < 0.01). R²(bold number) values represent the proportion of variance explainable by each variable in the model, χ² = 1.39, df = 1, p = 0.24, RMSEA = 0.032. MAP, mean annual precipitation; MAT, mean annual temperature; SOC, soil organic carbon content; TN, soil total nitrogen content.