海南木莲人工林生物量及养分分配

本文测定并分析了海南尖峰岭地区３０年生的热带乡土树种海南木莲人工林生物量及其估算模型，论述了生物量及其养分分配规律。指出：海南木莲各器官及整株生物量模型以幂函数模型Ｗ＝ａ（Ｄ２Ｈ）ｂ比较理想；全林分的总生物量为１４４．０６６ｔ／ｈｍ２，其中地上部分生物量８９．９３５ｔ／ｈｍ２。乔木层生物量占７８．８１％，林下植物层占２１．１９％；在乔木层中，树干、树叶、树枝、树皮和树根所占的比例分别是５４．１２７％、２．３５４％、７．７６２％、９．３７０％和２６．３８８％；乔木层中，各器官的养分含量，除Ｃａ外，都是叶比其它器官（枝、皮、干、根）的养分含量高许多，Ｎ、Ｐ、Ｋ、Ｃａ、Ｍｇ５个常量养分元素在海南木莲人工林生物体中的总贮量分别为５５７．７５４，２４．３３０，５９９．９０８，２７５．５５７，６４．１０３ｋｇ／ｈｍ２，各养分贮量在各器官中分布，除Ｐ外，从小到大为树叶、树枝、树皮、树干、树根

Biomass and Nutrient Allocation in Manglietia hainanensis Plantation Ecosystem at Jianfengling

Manglietia hainanensis Dandy is a fine native timber species used for reforestation in Hainan Island.In this paper,the biomass and its prediction models,biomass distribution among different diameter classes and components,and main nutrient allocation of 30 years old M. hainanensis plantation were studied.The result indicated that thd biomass regression equations of leaf, branch,trunk, bark,total above ground against D 2H were better than that of against D ;the total biomass was 144.066 t/hm 2 ,among which aboveground biomass was 89.935 t/hm 2;the tree layer and undergrowth biomass accounting for 78.81% and 21.19% of total biomass respectively;among the tree layer,biomass of bole,leaf,branch,bark and root were 54.127%,2.354%,7.762%,9.370% and 26.388% of the total respectively;excepting Ca,nutrient concentrations of N,P,K,Mg in leaf were higher than that in the other tree components(branch,bark,bole and root);the total nutrient of N,P,K,Ca,Mg stored in plant bodies of 30 years old M. hainanensis plantation ecosystem were 557.754,24.330,599.908,275.557,64.103 kg/hm 2,quantity arranged from small to large of nutrient storage in different tree components was leaf