NDLI: Shifting sources of soil labile organic carbon after termination of plant carbon inputs in a subtropical moist forest of southwest China

Content Provider	Springer Nature Link
Author	Feng, Wenting Schaefer, Douglas A. Zou, Xiaoming Zhang, Min
Copyright Year	2011
Abstract	Labile organic carbon (LOC) is a critical component of soil organic carbon (C) because of its intimate association with soil heterotrophic respiration and role in the decomposition of resistant soil organic matter. In a subtropical moist evergreen broad-leaved forest of southwest China, we examined changes of LOC and its potential turnover time, microbial biomass C (MBC), and soil microbial activity of the organic and the 0–10 cm mineral soil layers with aboveground plant litter and belowground root treatments. In February of 2004, removal of organic layer, root-trenching, and tree-girdling treatments were applied alone and in combination to manipulate plant-C inputs. In 2006, root-trenching and tree-girdling treatments did not significantly change LOC in the organic layer. In the 0–10 cm mineral soil layer, LOC increased substantially due to tree-girdling treatment, especially in the plots of tree-girdling and the combinations of three treatments, but this increase was absent in 2007. Soil MBC in these two layers generally did not change markedly after plant-C inputs manipulations except significant increase under tree-girdling treatment in 2006. The potential turnover times of LOC increased in all plots with the plant-C inputs manipulations. The lack of influence of plant-C inputs manipulations on LOC pools is likely due to high total soil organic C here, while insignificant changes of MBC suggest the soil microbes are not C limited in this forest. The changes of the potential turnover time of LOC imply that the sources of LOC have been shifted from fresh plant litter or root exudates to old soil organic C. Our results suggest that LOC recently derived from plants is preferred by microbes when available, but microbes can also use LOC from soil organic matter when fresh plant C is not available.
Starting Page	437
Ending Page	444
Page Count	8
File Format	PDF
ISSN	09123814
Journal	Ecological Research
Volume Number	26
Issue Number	2
e-ISSN	14401703
Language	English
Publisher	Springer Japan
Publisher Date	2011-01-07
Publisher Place	Japan
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Girdling Microbial biomass carbon Sequential fumigation incubation Soil labile organic carbon Trenching Turnover time Plant Sciences Behavioural Sciences Zoology Forestry Ecology Evolutionary Biology
Content Type	Text
Resource Type	Article
Subject	Ecology, Evolution, Behavior and Systematics

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