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作 者 ：方炜，李鸣光，王伯荪，张宏达

期 刊 ：热带亚热带植物学报 1993年 1期

关键词：凋落叶；分解速率；营养回归；

Keywords:Litter leaf, Decomposition rate, Nutrient return,

摘 要 ：本文工作是以黑石顶自然保护区森林群落为对象,在不同生长季节对凋落叶量与地被物现存量及其降解与营养回归进行了为期一年的研究.结果表明: 1、平均年凋落叶量为 3.468±0.196 t·ha~(-1),占叶现存生物量的20-22％。地被枯叶量为 3.078t·ha~(-1).每季度的总凋落叶量和每个树种的凋落叶量在总凋落叶量中的比例随季节而波动. 2、凋落叶中灰分、有机 C、全 N、全 P的年平均含量以绝对于物质计分别为4.11％、47.78％、0.8216％、0.0476％,含量最高值出现在雨季,最低值在干季.全K年平均含量为0.2653％,但含量最高在干季、最低在雨季,这是因为K很容易被淋溶.经过一年的降解,有机C、全N、全P、全K的含量分别降至38.85％、0.5118％、0.0367％和0.2223％。 3、经推算,全 P、全K、全N在凋落叶中的含量分别是在生活叶中含量的15.87-31.73％,17.69-26.53％,27.39-54.77％。这说明树叶中大部分的营养物质在凋落前已经通过某种途径发生了移动. 4、群落凋落叶半量降解时间平均约为3个月,失重率在雨季后期(6月～9月)最高(50.75％)...

Abstract:Litterfall, standing litter, and decomposition of litter leaf of Heishiding subtropical forest were studied for one year. Field samples were taken every three months. The seasonal dynamics of the nutrient return of litter leaf was analysed, and a frame of nutrient flux from litter leaf to the soil was founded quantitatively in south subtropical evergreen broad-leaved forest in Heishiding. The main results were as follows: 1. The standing litter leaf was about 3.078t. ha-1 the average production of litte...

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