| 摘要: |
| 本文对广西高峰林场6年生顶果木人工幼林生态系统的生物量及5种营养元素(N、P、K、Ca和Mg)的含量、积累量和分配进行了研究。结果表明：6年生顶果木人工幼林生态系统生物量为2524.66 kg/hm2,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。其营养元素积累总量为2393.24 kg/hm2,主要集中在干材和侧根,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年生顶果木人工幼林每积累1 t干物质需要5种营养元素的总量为21.90 kg,表明其早期生长所需营养较多。 |
| 关键词: 顶果木 人工林 生物量 营养元素 |
| DOI： |
| 分类号:S718.45 |
| 基金项目:广西自然科学(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) 。 |
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| Research of the content and accumulation and distribution characteristics of nutrients in Acrocarpus Fraxinifolius Plantations |
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ZhuYuan,TianXiang and WuQingbiao
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Gaofeng Foresty Farm of Guangxi,Forestry College of Guangxi University
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| Abstract: |
| The content, accumulation and distribution of five nutrients(N、P、K、Ca and Mg) in 6 years old Acrocarpus Fraxinifolius Plantations were studied in Gaofeng forestry farm of Guangxi,China, which could be beneficial to the fertilization management of Acrocarpus Fraxinifolius Plantations. The results showed that the total biomass storage of plantation ecosystems was 2524.66 kg/hm2 and the biomass content in different organs in tree layer of plantation increased in the order as 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 years old Acrocarpus Fraxinifolius Plantations were 2393.24 kg/hm2, mainly in stem wood and branch root, followed by leaves, the stem bark. N had the largest accumulation among the five nutrient elements, and the nutrient need of 1 t dry matter in Acrocarpus Fraxinifolius Plantations were 21.90 kg, which mean the plantation had lower nutrient use efficiency. |
| Key words: Acrocarpus fraxinifolius plantation biomass nutrient element |
