NDLI: Slow decomposition and limited nitrogen release by lower order roots in eight Chinese temperate and subtropical trees

Content Provider	SpringerLink
Author	Xiong, Yanmei Fan, Pingping Fu, Shenglei Zeng, Hui Guo, Dali
Copyright Year	2012
Abstract	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.
Starting Page	19
Ending Page	31
Page Count	13
File Format	PDF
ISSN	0032079X
Journal	Plant and Soil
Volume Number	363
Issue Number	1-2
e-ISSN	15735036
Language	English
Publisher	Springer Netherlands
Publisher Date	2012-05-22
Publisher Place	Dordrecht
Access Restriction	Subscribed
Subject Keyword	Carbon fraction Carbon quality Litter decay Root decomposition Litter quality Root branch order Plant Sciences Soil Science & Conservation Plant Physiology Ecology
Content Type	Text
Resource Type	Article
Subject	Soil Science Plant Science

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