苏门答腊金合欢群落生物量和凋落物量的研究

Abstract

[中文文摘]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。年调落物中氮、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。[英文文摘]This paper is a report on the studies on the biomass and litter fallof A.glauca community in artificial stand in Xiamen. 1. The biomass of 5-year-old A. glauca comm. is 81.0 t/ha, and theaverage net productivity is 16.2t/ha·a. Its solar radiant efficient is0.56%. The extinction coefficient of the stand in autumn is 0.52. Thisbiomass can be expressed by the regression equation as W=a+6D+cD~2in which W is the theoretical biomass; D is the basal diameter; a, b, andc are constants. 2. The annual litter fall in 5-year -old A. glauca comm. is 7.88t/ha.The content of the major elements in the falling leaves of A. glaucais (kg/ha·a) 152.1 for N, 32.3 for P, and 26.0 for K, and is higherthan those in Pinus massoniana and Acacia confusa locally. The decom-posite efficiency of the litter fall is fast.