中文摘要：

以江西省泰和县退化红壤区为研究区域，对1990年营造的枫香人工林凋落物数量、组成及其季节动态进行了监测；并采取尼龙网袋法，开展凋落叶分解对碳氮磷调控响应的原位模拟研究，旨在理解凋落物养分归还的基本规律。结果表明：枫香人工林年凋落物总量为3772．6～5719．1kg／hm2，年均凋落物量为4529．02kg／hm2，变异系数为23．55％。在凋落物组成中，其中叶占绝大部分（93．95％），枝次之（4．58％），皮、花与果很少，仅占1．47％；凋落物的产量表现出明显的季节动态，年内变化是11月份最大，与落叶量一致，表现为单峰型；落枝量较大值出现在3月和8月，表现为双峰型；枫香人工林凋落量的季节变化为冬季〉秋季〉夏季〉春季。第1年的枫香凋落叶分解速率变幅小于第2年的，凋落叶分解高峰出现在2011年7月；凋落叶分解速率季节变化差异显著，两年平均分解速率为0．7634g／（g·a）。

英文摘要：

Taking the degraded red soil region in Taihe County of Jiangxi Province as the research area, a study was carried out to determine the production, component and seasonal dynamics of litter fall in Liquidam- bar formosana plantation which was established in 1990.With the purpose of understanding the basic law of nu- trient return and the response to global changes of litter, the method of Nylon mesh bags was used to study the response of litter decomposition to carbon, nitrogen and phosphorus additions.The results showed that the annu- al litter production ranged from 3 772.6 kg/hm2 to 5 719.1 kg/hm2 with an average of 4 529.02 kg/hm2, 23.55% of the variation.In the litter production, 93.95%, 4.58%, 1.47% were occupied by leaves, branches, flower＋fruit＋barks.Monthly litter fall production showed obvious seasonal dynamics ,with the peak occurring in November. It was the same as the Monthly leaf litter. The litter production of the branches showed obvious two peaks occurring in March and August, respectively.The litter production changed in the order of winter〉autumn 〉summer〉spring.The litter decomposition rate changed less in the first year thanin the second year.The oeakof litter decomposition occurred in July, 2011.There were significant differences in seasonal litter decomposition rate, the mean decomposition rate of the litter was 0.763 4 g/（ g · a）.