苏门答腊金合欢群落生物量和凋落物量的研究

本文从群落生态学的角度探讨了厦门地区苏门答腊金合欢人工群落的生物量和凋落物量等生态特征。1． 5年生苏门答腊金合欢群落总生物量为81t·ha-1，平均年净生产量为16.2t·ha-1；秋季消光系数为0.52；年均光能利用率为0.56%。运用生物量基径二次相关方程，可估测该群落的生物量。2． 5年生苏门答腊金合欢群落年凋落物量为7.9t·ha-1。年凋落物中氮、磷和钾的含量分别为152.1、32.3和26.0kg·ha-1。 凋落叶中的氮、磷和钾含量均高于同一生境中先锋树种台湾相思和马尾松凋落叶中的相应指标，且其凋落物的分解速率高。

STUDIES ON BIOMASS AND LITTER FALL OF ACACIA GLAUCA COMMUNITY IN XIAMEN

This paper is a report on the studies on the biomass and litter fall of A.glauca community in artificial stand in Xiamen. 1. The biomass of 5-year-old A. glauca comm. is 81.0t/ha, and the average net productivity is 16.2t/ha·a. Its solar radiant efficient is 0.56%. The extinction coefficient of the stand in autumn is 0.52. This biomass can be expressed by the regression equation as W =a+bD+cD2 in which W is the theoretical biomass; D is the basal diameter;a, b, and c are constants. 2. The annual litter fall in 5-year-old A. glauca comm. is 7.88 t/ha. The content of the major elements in the falling leaves of A. glauca is (kg/ha·a) 152.1 for N, 32.3 for P, and 26.0 for K, and is higher than those in Pinus massoniana and Acacia confusa locally. The decomposite efficiency of the litter fall is fast.