• 研究论文 •

中国森林生态系统凋落叶分解速率的分布特征及其控制因子

1. 1四川农业大学生态林业研究所, 四川林业生态工程重点实验室, 成都 611130
2四川农业大学水稻研究所, 成都 611130
3四川农业大学土壤环境重点实验室, 成都 611130
• 收稿日期:2014-01-02 接受日期:2014-03-27 出版日期:2014-01-02 发布日期:2014-06-10
• 通讯作者: 徐振锋
• 基金资助:
基金项目 国家自然科学基金(31170423);基金项目 国家自然科学基金(31270498);基金项目 国家自然科学基金(31200474);国家“十二五”科技支撑计划(2011BAC09B05);四川省杰出青年学术与技术带头人培育项目(2012JQ0008);四川省杰出青年学术与技术带头人培育项目(012JQ0059);中国博士后科学基金(2013M540714);中国博士后科学基金(2012T50782)

Spatial characteristics in decomposition rate of foliar litter and controlling factors in Chinese forest ecosystems

TANG Shi-Shan1,YANG Wan-Qin1,YIN Rui1,XIONG Li1,WANG Hai-Peng2,Wang Bin1,ZHANG Yan1,PENG Yan-Jun1,CHEN Qing-Song3,XU Zhen-Feng1,*()

1. 1Key Laboratory of Ecological Forestry Engineering in Sichuan, Institute of Ecology & Forestry, Sichuan Agricultural University, Chengdu 611130, China
2Rice Institute, Sichuan Agricultural University, Chengdu 611130, China
3Key Laboratory of Soil Environment Protection, Sichuan Agricultural University, Chengdu 611130, China
• Received:2014-01-02 Accepted:2014-03-27 Online:2014-01-02 Published:2014-06-10
• Contact: XU Zhen-Feng

被引次数

35 | 36

Abstract:

Aims We aim to construct a national database for decomposition rate of forest foliar litter and to investigate the effects of controlling factors concerning geography (i.e. latitude, longitude, and altitude), climate (i.e. mean annual temperature and mean annual precipitation), and litter quality (i.e. the concentrations of N, P, K, and lignin, C:N ratio, and lignin:N ratio) on litter decomposition.
Methods We compiled a large dataset on decomposition constant (i.e. k value, which indicates the rate of litter decomposition) for foliar litter in Chinese forest ecosystems covering 74 study sites, and conducted simple and multiple regression analyses to explore the relationships of the k value with the controlling factors at the national scale.
Important findings The k value showed a tendency to decrease with latitude, longitude, altitude, lignin content, C:N, and lignin:N of litter, and to increase with mean annual temperature, mean annual precipitation, and litter nutrient concentrations (N, P and K) at the national scale. Single factors such as climate, litter quality, and geographic variable only explained 0.1%-30.3% of the variation in the rate of litter decomposition. However, a combination of climatic factors (mean annual temperature and mean annual precipitation) and latitude accounted for 34.1% of the variation in the rate of litter decomposition. Similarly, a combination of N, K, lignin, and lignin:N accounted for 21.7% of the variation in the rate of litter decomposition. Altitude, mean annual temperature, mean annual precipitation, N, K, and lignin:N collectively accounted for 74.4% of the variation in the rate of litter decomposition. Our results suggest that climate is the most important regulator of litter decomposition at the national scale and that the effects of litter quality is relatively small compared to climate.