邻域树种多样性对杉木叶片氮磷生态化学计量比的影响

冉松松, 余再鹏, 万晓华, 傅彦榕, 邹秉章, 王思荣, 黄志群

Effects of neighborhood tree species diversity on foliar nitrogen-phosphorus stoichiometry of Cunninghamia lanceolata

RAN Song-Song, YU Zai-Peng, WAN Xiao-Hua, FU Yan-Rong, ZOU Bing-Zhang, WANG Si-Rong, HUANG Zhi-Qun

表3 邻域树种多样性、功能性状差异和邻体竞争指数对杉木叶片氮磷含量及氮磷比影响的最优拟合模型结果

Table 3 Best-fitting mixed-effects model for the effects of neighborhood species richness, functional trait dissimilarity and neighbourhood competition index on foliar nitrogen (N) and phosphorus (P) contents and N:P of Cunninghamia lanceolata

变量 Variable 系数 Estimate 标准误 SE df t p R2m R2c 叶片氮含量 Foliar N content 截距 Intercept 2.87 0.02 66.4 184.16 <0.001 0.05 0.20 NSR 0.03 0.02 55.0 1.83 0.073 NCI -0.03 0.01 263.0 -2.06 0.04 RTD_diss -0.04 0.02 93.5 -2.30 0.024 叶片磷含量 Foliar P content 截距 Intercept -0.05 0.02 134.6 -2.45 0.016 0.17 0.29 NSR 0.03 0.02 123.9 1.26 0.212 NCI 0.02 0.02 263.4 0.92 0.361 SRL_diss 0.05 0.02 191.1 1.98 0.049 NSR × SRL_diss -0.05 0.02 87.6 -2.40 0.018 NCI × SRL_diss -0.05 0.02 263.8 -2.25 0.026 叶片氮磷比 Foliar N:P 截距 Intercept 2.89 0.03 159.0 114.09 <0.001 0.16 0.33 NSR 0.02 0.31 168.8 0.61 0.546 NCI -0.05 0.02 263.8 -2.90 0.004 NP_diss -0.06 0.03 228.5 -1.90 0.059 NSR × NP_diss 0.07 0.02 108.3 2.69 0.008 NCI × NP_diss 0.04 0.02 251.7 1.58 0.116