桤木幼林生物量与养分元素的积累特征  

Biomass and Nutrient Accumulation of Alnus cremastogyne Young Stand Forest

作　　者：任淇 赵海 蔡小虎[3] 王丽[3] 王宇[3] 闵安民[3] 任君芳 李红霞[3] 

机构地区：[1]阿坝州川西林业局,四川理县623102 [2]汶川县环境保护和林业局,四川汶川623000 [3]四川省林业科学研究院,四川成都610081 [4]阿坝州林业科学研究所,四川汶川623000

出　　处：《西部林业科学》2016年第1期93-98,共6页Journal of West China Forestry Science

基　　金：国家林业局林业公益性行业科研专项项目"川西山地退化风景林生态恢复关键技术研究(201104026)"

摘　　要：通过对林龄1-4年的桤木幼树生物量调查、器官中养分元素N、P、K、Ca、Mg和微量元素Fe、Zn的含量测定及积累量的分析,探讨桤木不同林龄植株的生物量和器官中养分元素分布与积累特征。结果表明,桤木平均木生物量及器官叶、枝、干、根的生物量与年龄呈正相关,生物量增长速率随林龄增加呈下降趋势;各器官生物量构成中,仅干的生物量占单株总生物量的比例随着年龄增加呈上升趋势。桤木器官中养分元素含量N>Ca>K>Mg>P>Fe>Zn;N、P、K元素在叶中含量较高,Ca、Mg、Fe元素在根中含量较高。养分元素N、P、K、Ca、Mg、Zn积累量在干中最高,Fe元素积累量在根中最高。桤木林龄1-4年当年养分元素(N、P、K、Ca、Mg)年净积累量分别为17.07 g/株、40.79 g/株、95.82 g/株和106.71 g/株,微量元素(Fe、Zn)当年净积累量分别为335.04 mg/株、577.26 mg/株、1 267 mg/株和1 525.27 mg/株。To explore plant biomass, distribution and accumulation of nutrient elements in organs ofAlnus cremasto- gyne in different ages from 1-4 years＇ old, the biomass, N, P, K, Ca, Mg, Fe, and Zn were tested. The result shows that the average biomass of the whole tree and the biomass of leaf, branch, stem, and root have a positive correlation with its age, but biomass growth rate have a decreasing tendency with tree age increasing, and only the biomass proportion of stem in the whole individual plant shows an increasing tendency with age. The contents of nutrient element in organs shows an order of N〉Ca〉K〉Mg〉P〉Fe〉Zn, the contents of N, P, K in the leaf is higher than in the other organs, and that of Ca, Mg, Fe in the root is higher than in the other organs. The accumulations of N, P, K, Ca, Mg, Zn are the highest in the stem, and that of Fe is the highest in the root. The net annual accumulation of N, P, K, Ca, Mg in average tree from 1 to 4 years are 17. 07 g, 40. 79 g, 95. 82 g and 106. 71 g, respectively, and that of Fe, Zn are 335.04 mg, 577.26 mg, 1 267 mg, and 1 525.27 mg, respectively.

关 键 词：桤木 不同林龄 养分元素的需求量 生物量 养分元素 

分 类 号：S792.14[农业科学—林木遗传育种]