基于凋落物野外收集的方法，于2004年对北亚热带地区6种主要森林类型凋落物形成过程中碳素归还特征进行了为期1~2 a的研究。结果表明：(1)次生林在3、6月份，马尾松 林2、4月份凋落物有机碳输入形成双峰值；杉木在12月份、早竹在3月份、毛竹林在5—6月份凋落物有机碳输入形成单峰值；(2)次生林以凋落物形式年输入的有机碳储量达到3.22 t/hm2，其次是杉木林和马尾松林，两种不同经营方式毛竹林凋落物有机碳输入量基本相同；早竹林分有机碳输入量最小(1.39 t/hm2)；(3)6种土地利用类型凋落物有机碳数量组成 以叶片为主，占整个凋落物的比例为58.00 %~73.65 %，枯枝、果实、杂物等有机碳数量各自占据的比例较小；(4)次生林以凋落物形式归还到地表的有机碳数量最大，表明对改善 土壤有机质状况效果最好，自我肥力能力强，这也说明常绿阔叶林碳汇生态功能具有其他土地利用类型不可比拟的优势。
Abstract
Based on the field study of forest littlefall collection, this paper dealt with carbon dynamics of forest litter under six landuse types in the subtropical China in 2004. The results showed that: (1) Carbon amount of litterfall of the naturally secondly stands and masson pines formed doublepeak in Mar.and Jun., Feb.and Apr., respectively, while Chinese fir stand, Ph.praecox and moso stand formed singlepeak in Dec., Mar., May and Jun. respectively. (2) Carbon amount of littlefall of the naturally secondly stands was 3.22 t/hm2, the following were Chinese fir stand and masson pines, the extensively and intensively managed moso stand were almost the same, while the least was Ph.praecox stands, which was only 1.39 t/hm2. (3) Components of forest litterfall carbon were mainly composed of leaf, which were among 58.00 % and 73.65 %, while branch, fruit and others occupied less proportion of forest litterfall. (4) The naturally secondly stands had the best ability of improving the soil quality by selffertilization, which meant their ecological function had advantages over other landuse types.
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参考文献
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基金
收稿日期：2009-11-08修回日期：2010-05-05基金项目：浙江省自然科学基金项目(Y507684);浙江省科技厅重点农业项目(2008C12067-1);浙江省—中国林业科学研究院合作项目 (2007SY11);中央级公益性科研院所基本科研业务费专项资金项目(RISF060701)作者简介：李正才(1965—)，副研究员，博士。Email: lizccaf@126.com。引文格式：李正才,杨 校生,周本智,等. 北亚热带6种森林凋落物碳素归还特征
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