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王丽, 龙汉利, 郭洪英, 辜云杰, 肖兴翠, 盛玉珍. 不同林分密度对巨桉养分空间分配及积累研究[J]. 四川林业科技, 2016, 37(6): 1-5. DOI: 10.16779/j.cnki.1003-5508.2016.06.001
引用本文: 王丽, 龙汉利, 郭洪英, 辜云杰, 肖兴翠, 盛玉珍. 不同林分密度对巨桉养分空间分配及积累研究[J]. 四川林业科技, 2016, 37(6): 1-5. DOI: 10.16779/j.cnki.1003-5508.2016.06.001
WANG Li, LONG Han-li, GUO Hong-ying, GU Yun-jie, XIAO Xing-cui, SHENG Yu-zheng. A Study of the Distribution and Accumulation of Major Nutrient Elements in Different Densities of Eucalyptus grandis[J]. Journal of Sichuan Forestry Science and Technology, 2016, 37(6): 1-5. DOI: 10.16779/j.cnki.1003-5508.2016.06.001
Citation: WANG Li, LONG Han-li, GUO Hong-ying, GU Yun-jie, XIAO Xing-cui, SHENG Yu-zheng. A Study of the Distribution and Accumulation of Major Nutrient Elements in Different Densities of Eucalyptus grandis[J]. Journal of Sichuan Forestry Science and Technology, 2016, 37(6): 1-5. DOI: 10.16779/j.cnki.1003-5508.2016.06.001

不同林分密度对巨桉养分空间分配及积累研究

A Study of the Distribution and Accumulation of Major Nutrient Elements in Different Densities of Eucalyptus grandis

  • 摘要: 选择立地条件相似、生长良好的5a生巨桉人工林为研究对象,通过设置556株·hm-2和1667株·hm-2两种不同的林分密度,对其主要营养元素含量、分配及生物量分配进行了研究。结果表明:①两种不同林分密度巨桉单株营养元素含量在不同器官的分配规律基本一致,均为树叶 > 树干 > 大枝或小枝 > 果实 > 树皮;②从营养元素和有机质在树干的分配来看,两种密度巨桉人工林P、K、Mg和Ca变化趋势相同,基本随着树干高度增加而增加,有机C在556株·hm-2样地随着树干高度增加而逐渐增加,而1667株·hm-2样地则是逐渐减小,N在556株·hm-2样地为随着树干高度增加而逐渐增加的趋势,1667株·hm-2样地的变化趋势为先增加后降低再增加的趋势;③从两种密度巨桉生物量的分配看,生物量分配为树干 > 树皮或大枝 > 小枝 > 叶 > 果实;④两种密度巨桉人工林营养元素积累量均表现一致规律,均为Ca最多,分别为601.78 kg·hm-2和1204.43kg·hm-2,其次为N、K、Mg和P积累最低。

     

    Abstract: In this paper,studies were made of the distribution and accumulation of major elements of 5-year old Eucalyptus grandis forest with the densities of 556 trees per hectar and 1667 trees per hectar.The results showed that:①The distribution of major nutrient element content in different organs of 2 kinds of densities was nearly the same.And the ranked order was leaf > tree trunk > big branch or branchlet > fruit > bark; ②From the distribution of nutrient elements and organic matter in the trunk,P,K,Mg and Ca content presented basically increasing along with the trunk height.And the organic matter content increased with the trunk height in low density stand,while the result was opposite in high density stand.At the same time,N content increased witn the trunk height in low density stand,but the content in high density increased after the decrease and increased at the last.③From the ditribution of biomass,the ranked ordered was tree trunk > bark or big branch > branchlet > leaf > fruit.④The accumulation of major nutrient element content in different organs of 2 kinds of densities was nearly same.Ca content was the highest in two kinds of piantations,followed by N,K,Mg and P content.Ca content was 601.78 kg per hectare in low density stand and 1 204.43 kg per hectare in high density stand.

     

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