Slow decomposition and limited nitrogen release by lower order roots in eight Chinese temperate and subtropical trees
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- 作者：Yanmei Xiong (1) (2)
Pingping Fan (3)
Shenglei Fu (4)
Hui Zeng (1) (2)
Dali Guo (5) (6) - 关键词：Carbon fraction ; Carbon quality ; Litter decay ; Root decomposition ; Litter quality ; Root branch order
- 刊名：Plant and Soil
- 出版年：2013
- 出版时间：2 - February 2013
- 年：2013
- 卷：363
- 期：1
- 页码：19-31
- 全文大小：316KB
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Pingping Fan (3)
Shenglei Fu (4)
Hui Zeng (1) (2)
Dali Guo (5) (6)
1. Key Laboratory of Cyclic Economy, School of Urban Planning and Design, Shenzhen Graduate School, Peking University, Shenzhen, 518055, China
2. Department of Ecology, College of Urban and Environmental Sciences, Peking University, Beijing, 100871, China
3. Shandong Academy of Sciences, Institute of Ocean Instrumentation, Qingdao, 266001, China
4. Key Laboratory of Vegetation Restoration and Management of Degraded Ecosystems, South China Botanical Garden, Chinese Academy of Sciences, Guangzhou, 510650, China
5. Key Laboratory of Ecosystem Network Observation and Modeling, Synthesis Research Center of Chinese Ecosystem Research Network, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing, 100101, China
6. Datun Road 11#, Chaoyang District, Beijing, 100101, China - ISSN：1573-5036
文摘
Background and aims Roots of the lowest branch orders have the highest mortality rate, and may contribute predominately to plant carbon (C) and nutrient transfer into the soil. Yet patterns and controlling factors of the decomposition of these roots are poorly understood. Methods We conducted a two-year field litterbag study on different root orders and leaf litter in four temperate and four subtropical tree species. Results Five species showed slower decay rates in lower- (order 1-) than higher-order (order 3-) roots, and all species showed slower decay rates in lower-order roots than leaf litter. These patterns were strongly related to higher acid-insoluble fraction in lower- than higher-order roots, and in roots than in leaf litter, but were unrelated to initial N concentration. Litter N was predominantly in recalcitrant forms and limited amount of N was released during the study period;only 12?% of root N and 26?% of leaf litter N was released in 2?years. Conclusions We conclude that the slow decomposition of lower-order roots may be a common phenomenon and is mainly driven by their high acid-insoluble fraction. Moreover, litter N, especially root N, is retained during decomposition and may not be available for immediate plant uptake.