摘要
为了解北亚热带林植物叶水平生态化学计量特征和季节变化规律,以安徽石台常绿阔叶林三种优势乔木(甜槠、树参和老鼠矢)为研究对象,通过不同季节采集其成熟叶片进行分析。结果显示,3树种叶片C含量全年变化规律一致,呈先减后增趋势。区域中N元素相对充足,而P元素成为植物生长受限元素。C/P与C/N比值之间比较发现,甜槠对N、P的利用效率最高,其次为老鼠矢,树参的养分利用效率最低。3树种叶片N、P含量及C/N、C/P和N/P周年变化规律各不相同,N、P含量呈现高度正相关,叶片C/N和C/P的季节变化趋势与叶片N、P含量的变化规律相反,叶片N/P的季节变化趋势与叶片P含量的变化规律相反,表明了叶片N、P含量对叶片C/N与C/P的主导作用以及叶片N/P主要受P含量决定。本实验中,各指标全年变异系数大小为:P>C/P>N/P>N>C/N>C。C、P、C/N、C/P以及N/P的变异来源均表现为植物种类影响最大,月份间差异次之,月份和植物种类交互作用的影响最小。
In order to reveal the characteristics of ecological stoichiometry and seasonal variations of subtropical evergreen broad-leaved forest, the seasonal changes of foliar C, N, and P ecological stoichiometry of three dominant tree species(Castanopsis eyrei, Dendropanax dentiger and Symplocos stellaris) were investigated in Shitai, Anhui. The mature leaves of those trees in a three-month interval were collected for chemical analysis. The results showed that foliar C contents of three species decreased in spring and summer, while increased in autumn and winter. The N content was relatively high, while the P was relatively low. Compared with C:N and C:P ratios, utilization efficiencies of N and P were the highest in Castanopsis eyrei, followed by Symplocos stellaris, while Dendropanax dentiger was lowest. The annual trends of foliar N, P contents and C:N, C:P and N:P ratios were not clear for all three dominant species. The N content was significantly positively correlated to P content. The annual trends of C:N and C:P ratios were opposite. The N:P ratio and P content showed the similar pattern. The results indicated that foliar N, P contens played a predominant role in determining C:N and C:P ratios, meanwhile, N:P ratio was controlled by P content. The variation coefficient of these parameters was in the sequence of P > C:P > N:P > N > C:N > N. Factorial analysis of variation for these parameters showed that foliar C, P, C:N, C:P and N:P ratios were mainly dominated by plant species, followed by months, while the interaction was lowest.
出处
《土壤通报》
CAS
CSCD
北大核心
2014年第5期1170-1174,共5页
Chinese Journal of Soil Science
基金
国家"973"计划(2010CB950602)
国家自然科学基金(31370626)资助
关键词
北亚热带
常绿阔叶林
化学计量
季节变化
North subtropics
Evergreen broad-leaved forest
Stoichiometry
Season variation
