肉桂幼林生物量与营养元素分布研究

Biomass Accumulation and Nutrient Element Distribution in Young Growth of Cinnamomum cassia

在广西高峰林场界牌分场对林龄１～４ 年的肉桂幼林进行生物量及营养元素测定， 研究肉桂幼林的生物量和营养元素 （Ｎ、Ｐ、Ｋ、Ｃａ、Ｍｇ） 在各器官中的分布。结果表明， 肉桂幼林生物量随林龄的增大而逐渐积累，４ 年生肉桂幼林生物量达到１６ ３６１．４ ｋｇ／ｈｍ ２，其中经济生物量为９ ２８４．５ ｋｇ／ｈｍ ２·ａ， 平均林分净生产量为４ ０９０．４ ｋｇ／ｈｍ ２·ａ； 林龄增加， 树叶、树枝、树干的组成比例增加， 树根和干皮则呈下降趋势； 各器官的营养元素含量以Ｎ最高， 其次是Ｋ 和Ｃａ， Ｐ和Ｍｇ 最低； 各营养元素贮量在树叶最高， 树干最小； ８５％ 以上营养元素集中在树叶、树枝、干皮和树根中。

The biomass accumulation and nutrient element (N,P,K,Ca,Mg) distribution was studied in Cinnamoumum cassia young growth (CCYG) of 1 to 4 year stand age at Guangxi Gaofeng Tree Farm,Jiepai Branch.The results showed that biomass of CCYG incresed with stand age.Biomass accumulation of 4 year old Cinnamomum cassia amounted to 16 361 4 kg/hm 2,including 9 284 5 kg/hm 2·a of economic biomass and 4 090 4 kg/hm 2·a of average stand net production;The composition of leaf,branch and stem increased with stand age in proportion; white the root, main stem and bark decreased As for the content of nutrient elements of all organs,the amount of N was the most, K and Ca the second, P and Mg the least The nutrient element accumulation was the most in leaf, the least in stem;More than 85% of nutrient element were concentrated in the leaf,branch,bark and root