安徽肖坑亚热带常绿阔叶林4优势树种叶养分动态及其利用效率  

Foliar Nutrient Dynamics and Nutrient Use Efficiency of Four Dominant Tree Species in a Subtropical Evergreen Broad-leaved Forest in Xiaokeng,Southern Anhui

作　　者：王陆军[1] 张赟齐[1] 丁正亮[1] 徐小牛[1] 

机构地区：[1]安徽农业大学,合肥230036

出　　处：《东北林业大学学报》2010年第7期10-12,共3页Journal of Northeast Forestry University

基　　金：国家自然科学基金项目(30471386;30771719)资助

摘　　要：树木叶养分利用效率是反映树木对养分利用及其对养分贫瘠环境适应能力的一个重要生理生态指标。以安徽肖坑亚热带常绿阔叶林为研究对象,对4种优势树种苦槠(Castanopsis sclerophlla)、甜槠(Castanopsis eyrei)、青冈(Cyclobalanopsis glauca)、石栎(Lithocarpus glaber)的叶养分季节动态和利用效率进行了研究。结果表明:同一树种鲜叶各养分质量分数随季节变化差异明显;不同树种鲜叶及落叶的不同养分平均质量分数亦存在明显差异。同一树种各养分元素在不同季节的利用效率不同,并且各树种间各养分利用效率差异明显;4种常绿阔叶树种在不同季节都显示出对P的利用效率最高,其它养分依次为Mg>K>Ca>N;各树种P利用效率远高于其它元素,表明P可能是该地区影响常绿阔叶林生长发育的重要限制因子。4种常绿阔叶树种各养分元素利用效率的相关分析显示,钙养分利用效率和镁养分利用效率之间存在显著正相关(p<0.05),其它养分元素利用效率之间的相关性不显著。The seasonal dynamics and use efficiency of foliar nutrients （N,P,K,Ca and Mg） were studied for four dominant tree species,Castanopsis sclerophylla,Castanopsis eyrei,Cyclobalanopsis glauca and Lithocarpus glaber,in a subtropical evergreen broad-leaved forest at Xiaokeng of southern Anhui. Results showed that there existed an obvious difference in seasonal dynamics of foliar nutrient concentrations for all of the species. The significant differences were observed in the mean concentrations of all elements between live and recently senesced leaves. There was a significant difference in nutrient use efficiency among the four species. P use efficiency of all the species was highest during different seasons,followed by Mg,K,Ca,and N,which indicated that P could be an important limiting nutrient influencing the growth and development of the evergreen broad-leaved forests in the study area. Regression analysis showed that there was a significantly positive correlation between Ca use efficiency and Mg use efficiency （p0.05）. However,no significant relations were observed for the other nutrient elements.

关 键 词：常绿阔叶林 养分利用效率 季节动态 落叶 

分 类 号：S718.55[农业科学—林学] Q945.79[生物学—植物学]