Labile carbon retention compensates for CO2 released by priming in forest soils
Qiao, N; Schaefer, D; Blagodatskaya, E; Zou, XM; Xu, XL; Kuzyakov, Y
2014
Source PublicationGLOBAL CHANGE BIOLOGY
ISSN1354-1013
Volume20Issue:6Pages:1943-1954
AbstractIncrease of belowground C allocation by plants under global warming or elevated CO2 may promote decomposition of soil organic carbon (SOC) by priming and strongly affects SOC dynamics. The specific effects by priming of SOC depend on the amount and frequency of C inputs. Most previous priming studies have investigated single C additions, but they are not very representative for litterfall and root exudation in many terrestrial ecosystems. We evaluated effects of C-13-labeled glucose added to soil in three temporal patterns: single, repeated, and continuous on dynamics of CO2 and priming of SOC decomposition over 6 months. Total and C-13 labeled CO2 were monitored to analyze priming dynamics and net C balance between SOC loss caused by priming and the retention of added glucose-C. Cumulative priming ranged from 1.3 to 5.5mgCg(-1) SOC in the subtropical, and from -0.6 to 5.5mgCg(-1) SOC in the tropical soils. Single addition induced more priming than repeated and continuous inputs. Therefore, single additions of high substrate amounts may overestimate priming effects over the short term. The amount of added glucose C remaining in soil after 6months (subtropical: 8.1-11.2mgCg(-1) SOC or 41-56% of added glucose; tropical: 8.7-15.0mgCg(-1) SOC or 43-75% of glucose) was substantially higher than the net C loss due to SOC decomposition including priming effect. This overcompensation of C losses was highest with continuous inputs and lowest with single inputs. Therefore, raised labile organic C input to soils by higher plant productivity will increase SOC content even though priming accelerates decomposition of native SOC. Consequently, higher continuous input of C belowground by plants under warming or elevated CO2 can increase C stocks in soil despite accelerated C cycling by priming in soils.
SubtypeJournal
KeywordC-13 addition frequency carbon balance glucose litter decomposition priming effect root exudates soil organic matter stability subtropical forest tropical forest
Subject AreaBiodiversity & Conservation ; Environmental Sciences & Ecology
WOS Subject ExtendedBiodiversity Conservation ; Ecology ; Environmental Sciences
WOS KeywordORGANIC-MATTER MINERALIZATION ; ELEVATED CO2 ; MICROBIAL BIOMASS ; TROPICAL FOREST ; LITTER DECOMPOSITION ; POPLAR PLANTATION ; ROOT EXUDATION ; TEMPERATURE SENSITIVITY ; FACE EXPERIMENTS ; NITROGEN UPTAKE
Indexed BySCI
Language英语
WOS IDWOS:000336482700020
PublisherWILEY-BLACKWELL
Citation statistics
Document Type期刊论文
Identifierhttp://ir.igsnrr.ac.cn/handle/311030/44541
Collection生态系统网络观测与模拟院重点实验室_生态网络实验室
Recommended Citation
GB/T 7714
Qiao, N,Schaefer, D,Blagodatskaya, E,et al. Labile carbon retention compensates for CO2 released by priming in forest soils[J]. GLOBAL CHANGE BIOLOGY,2014,20(6):1943-1954.
APA Qiao, N,Schaefer, D,Blagodatskaya, E,Zou, XM,Xu, XL,&Kuzyakov, Y.(2014).Labile carbon retention compensates for CO2 released by priming in forest soils.GLOBAL CHANGE BIOLOGY,20(6),1943-1954.
MLA Qiao, N,et al."Labile carbon retention compensates for CO2 released by priming in forest soils".GLOBAL CHANGE BIOLOGY 20.6(2014):1943-1954.
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