【摘要】 在安庆市区选择7个生境,于夏季和冬季采集香樟叶片和土壤样品,分析叶片N、P养分化学计量特征在季节和生境间的变异特征及其与土壤和叶片性状的关系。结果表明:夏季和冬季香樟叶片N含量均值为10.91和11.10 mg/g,叶片P含量均值为1.04和1.07 mg/g,叶片N∶P均值为10.62和10.47,呈明显的N限制。各参数变异系数在0.158～0.275之间,属中等偏弱变异。叶片养分计量特征在不同生境间及各生境的不同季节间均有一定差异,但无明显规律。夏季叶片N、P之间呈等速分配关系,而冬季呈N分配速率高于P的异速关系。夏季叶片P分配速率高于冬季,符合生长速率理论。叶片化学计量特征与土壤因子关系较弱,而与叶片自身属性(如叶片大小、含水量)关系密切。更多还原

【Abstract】 Seven habitats in Anqing City were selected, leaf samples of Cinnamomum camphora and the corresponding soil samples were collected in either summer or winter, and then the variation characteristics of leaf N-P stoichiometry on seasons and habitats and their correlations, and the relationships with soils and leaf functional traits were analyzed. The result showed that, the average contents of leaf N were 10.91 and 11.10 mg/g, the mean values of leaf P were 1.04 and 1.07 mg/g, and the mean values of leaf N∶P were 10.62 and 10.47, reflecting obvious N limitation. The variation coefficients ranged from 0.158 and 0.275, showing moderate and weak variation. The leaf stoichiometric characteristics varied in habitats and seasons in different habitats, but non-significant tendency was found. Leaf N and P represented isometric relationship in summer, while they presented allometric relationship that the allocation rate of leaf N is higher than leaf P. The allocation rate of leaf P in summer was higher than that in winter, according with the Growth Rate Hypothesis. Leaf stoichiometric characteristics of C. camphora were related with soil factors weakly, but correlated with leaf traits(e.g., leaf size and water content) closely.更多还原