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季风常绿阔叶林是亚热带地区结构最复杂、生产力最高、生物多样性最丰富的地带性植被类型之一,研究其化学计量学特征对于认识生态系统养分循环特征和限制状况以及系统稳定机制具有重要意义。本文基于云南普洱地区29块30 m×30 m的典型样地调查与取样,测定了152种木本植物叶片C、N、P含量,分析了其化学计量特征。结果表明,该区域季风常绿阔叶林叶片C、N、P含量算术平均值分别为458.17、20.88和1.42 mg·g-1,变异系数分别为7.12%、34.89%和51.81%;C/N、C/P及N/P算术平均值分别为24.96、394.74和16.50,变异系数分别为33.46%、38.79%和51.44%。相关分析表明,C含量和N含量呈极显著负相关(P=0.005),C含量和P含量负相关程度不明显(P=0.078),N含量和P含量呈极显著正相关(P<0.001)。不同科植物叶片除C含量整体变异较小外,N、P及C/N、C/P、N/P变异较大。乔木与灌木,以及乔木与藤本之间,叶片除C含量的差异不显著外,N、P、C/N、C/P、N/P的差异均达显著水平(P<0.05),其中乔木的N、P含量均显著低于灌木和藤本。152种木本植物叶片N/P算术平均值为16.50,说明普洱季风常绿阔叶林植物总体受P元素限制。
The monsoon evergreen broad-leaved forest is one of the most complex and productive vegetation types in the subtropical zone with the most abundant biological diversity. Studying its stoichiometric characteristics is of great significance in understanding the characteristics and limitations of ecosystem nutrient cycling and the system stability mechanism Significance. Based on the investigation and sampling of 29 typical plots of 30 m × 30 m in Pu’er, Yunnan, the C, N and P contents of 152 woody plants were determined and their stoichiometric characteristics were analyzed. The results showed that the arithmetic mean values of C, N and P in monsoon evergreen broad-leaved forest were 458.17, 20.88 and 1.42 mg · g-1, respectively, and the coefficients of variation were 7.12%, 34.89% and 51.81%, respectively. C / N The arithmetic mean of C / P and N / P were 24.96, 394.74 and 16.50 respectively, and the coefficient of variation were 33.46%, 38.79% and 51.44% respectively. Correlation analysis showed that there was a significant negative correlation between C content and N content (P = 0.005), negative correlation between C content and P content (P = 0.078), N content and P content ). In addition to the C content of different branches of the whole plant variation is small, N, P and C / N, C / P, N / P variation. The differences of N, P, C / N, C / P and N / P between tree and shrub and between tree and vine were not significant except C N and P contents were significantly lower than shrubs and Fujimoto. 152 arborvitae leaves N / P arithmetic average of 16.50, indicating the Pu’er monsoon evergreen broad-leaved forest plants by the P element limits.