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为探索植物叶片氮(N)、磷(P)、碳(C)生态化学计量特征随植物生长发育的变化规律,在普洱季风常绿阔叶林中,选取6种优势植物种(红锥(Castanopsis hystrix)、短刺锥(Castanopsis echidnocarpa)、泥柯(Lithocarpus fenestratus)、截果柯(Lithocarpus truncatus)、西南木荷(Schima wallichii)、茶梨(Anneslea fragrans))采集叶片,分析其N、P、C含量及化学计量比随植物生长发育的变化。结果显示:6种植物在不同生长阶段的N含量变化范围为7.90–17.72 mg·g–1,P为0.34–1.39 mg·g–1,C为458.48–516.87 mg·g–1,C:N为28.04–65.70,N:P为11.41–63.50,C:P为355.23–1 878.17,且不同生长阶段6种植物及总体叶片N、P、C含量及其化学计量比变化趋势各异。在变异系数上,N:P比整体变异最大,为36.46%(变化范围19.19%–91.65%),其次为C:P,为34.80%(变化范围15.99%–91.60%),C的整体变异最小,为3.12%(变化范围1.61%–5.89%)。变异来源分析结果显示,N含量、C含量、C:N、N:P及C:P均主要受植物生长阶段的影响,而P含量主要受物种与生长阶段的交互作用影响。
In order to explore the changes of ecological stoichiometry of plant N, P and C with plant growth and development, six dominant plant species (Castanopsis hystrix Castanopsis echidnocarpa, Lithocarpus fenestratus, Lithocarpus truncatus, Schima wallichii and Anneslea fragrans were collected to analyze their N, P, C Content and stoichiometry with changes in plant growth and development. The results showed that the N content of the six plants varied from 7.90 to 17.72 mg · g-1 at different growth stages, P was 0.34-1.39 mg · g-1, C was 458.48-516.87 mg · g-1, C: N 28.04-65.70, N: P was 11.41-63.50, C: P was 355.23-1 878.17, and the contents of N, P and C and the stoichiometry of 6 species and total leaves in different growth stages were different. In terms of coefficient of variation, the N: P ratio was the largest, 36.46% (range 19.19% -91.65%), followed by C: P at 34.80% (range 15.99% -91.60%), with the smallest overall variation of C , 3.12% (range 1.61% -5.89%). Variation analysis showed that N content, C content, C: N, N: P and C: P were mainly affected by plant growth stage, while P content was mainly affected by the interaction between species and growth stage.