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	Slow decomposition and limited nitrogen release by lower order roots in eight Chinese temperate and subtropical trees
	Xiong Y. M. ; Fan P. P. ; Fu S. L. ; Zeng H. ; Guo D. L.
	2013
关键词	Carbon fraction Carbon quality Litter decay Root decomposition Litter quality Root branch order soil organic-matter plant litter decomposition longleaf pine forest branch order leaf-litter carbon quality ecosystems dynamics patterns
英文摘要	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. We conducted a two-year field litterbag study on different root orders and leaf litter in four temperate and four subtropical tree species. Five species showed slower decay rates in lower- (order 1-2) than higher-order (order 3-5) 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. 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.
出处	Plant and Soil
卷	363
期	1-2
页	19-31
收录类别	SCI
语种	英语
ISSN号	0032-079X
内容类型	SCI/SSCI论文
源URL	[http://ir.igsnrr.ac.cn/handle/311030/30144]
专题	地理科学与资源研究所_历年回溯文献
推荐引用方式 GB/T 7714	Xiong Y. M.,Fan P. P.,Fu S. L.,et al. Slow decomposition and limited nitrogen release by lower order roots in eight Chinese temperate and subtropical trees. 2013.

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