顶果木人工林营养元素含量、积累与分配特征  

Research of the Content and Accumulation and Distribution Characteristics of Nutrients in Acrocarpus fraxinifolius Plantations

作　　者：朱媛[1] 田湘[1,2] 吴庆标[1] 

机构地区：[1]广西大学林学院,广西南宁530004 [2]广西国营高峰林场,广西南宁530001

出　　处：《广东林业科技》2015年第5期69-73,共5页Forestry Science and Technology of Guangdong Province

基　　金：广西自然科学基金项目(2012GXNSFAA053053);广西林业科技项目"珍稀树种顶果木人工林综合技术研究"(桂林科字[2013]第19号)

摘　　要：对广西高峰林场6 a生顶果木(Acrocarpus fraxinifolius)人工林生物量及N、P、K、Ca和Mg共5种营养元素的含量、积累量和分配特征分析表明:6 a生顶果木人工林生物量为2 524.66 kg/hm^2,乔木层各器官生物量排序为根(根兜+侧根)>干>叶>枝>皮。各器官(除皮外)营养元素含量均以N最高,K和Ca次之,Mg、P较低。6 a生顶果木营养元素积累总量为2 393.24 kg/hm^2,主要集中在干和侧根,其次是叶,最少是皮。就5种营养元素积累量而言,N的积累量最多。6 a生顶果木人工幼林每积累1t干物质需要5种营养元素的总量为21.90kg,营养元素利用效率较低。The contents, accumulation and distribution of five nutrients （N, P, K, Ca and Mg） in 6-year- old Acrocarpus fraxinifolius plantations were studied on Gaofeng forestry farm of Guangxi, China. The results showed that the total biomass storage of plantation ecosystems was 2 524.66 kg/hm^2 and the biomass content in different organs in tree layer of plantation increased in the order of root〉stem wood〉leaf〉branch〉stem bark. N was the nutrient element with highest content, followed by K and Ca, Mg and P had the lowest content except in the stem bark. The nutrient storage of 6-year-old A. fraxinifolius plantations was 2 393.24 kg/hm^2, mainly in stem wood and branch root, followed by leaves, and then the stem bark. N had the largest accumulation among the five nutrient elements, and the nutrient need of one ton dry matter in A. fraxinifolius plantations was 21.90 kg, suggesting lower nutrient use efficiency of the planatation.

关 键 词：顶果木 人工林 生物量 营养元素 

分 类 号：S718.45[农业科学—林学]