云南普洱季风常绿阔叶林优势物种不同生长阶段叶片碳、氮、磷化学计量特征

刘万德, 苏建荣, 李帅锋, 郎学东, 张志钧, 黄小波

Leaf carbon, nitrogen and phosphorus stoichiometry at different growth stages in dominant tree species of a monsoon broad-leaved evergreen forest in Pu’er, Yunnan Province, China

LIU Wan-De,SU Jian-Rong,LI Shuai-Feng,LANG Xue-Dong,ZHANG Zhi-Jun,HUANG Xiao-Bo

表3 不同生长阶段植物叶片N、P、C含量及化学计量比的变化

Table 3 Variations of leaf N, P and C contents and mass ratios of C:N, N:P, C:P at different growth stages

参数 Parameter 生长阶段 Growth stages 平均值 Mean 变异系数 Coefficient of variation (%) 极差 Range N 幼苗幼树 Seedling 12.92 22.45 12.27 小树 Sapling 12.96 29.08 16.89 中树 Medium tree 13.94 22.83 12.29 大树 Mature tree 12.87 16.72 6.96 P 幼苗幼树 Seedling 0.45 35.22 0.76 小树 Sapling 0.53 44.66 1.01 中树 Medium tree 0.66 72.98 1.61 大树 Mature tree 1.01 65.71 1.53 C 幼苗幼树 Seedling 484.09 5.06 77.23 小树 Sapling 487.59 4.15 74.98 中树 Medium tree 488.38 5.11 107.37 大树 Mature tree 489.16 2.88 42.31 C:N 幼苗幼树 Seedling 39.77 30.18 58.16 小树 Sapling 40.97 32.30 53.72 中树 Medium tree 37.24 28.78 41.14 大树 Mature tree 39.19 21.22 26.09 N:P 幼苗幼树 Seedling 33.39 54.41 63.98 小树 Sapling 26.22 30.26 31.49 中树 Medium tree 26.44 38.23 34.00 大树 Mature tree 19.86 64.21 26.90 C:P 幼苗幼树 Seedling 1 225.22 38.58 1 808.29 小树 Sapling 1 023.82 27.24 1 094.90 中树 Medium tree 954.83 36.11 1 209.56 大树 Mature tree 803.67 74.58 1 647.69