Unchanged carbon balance driven by equivalent responses of production and respiration to climate change in a mixed-grass prairie
Xu, X; Shi, Z; Chen, XC; Lin, Y; Niu, SL; Jiang, LF; Luo, RS; Luo, YQ
2016
Source PublicationGLOBAL CHANGE BIOLOGY
ISSN1354-1013
Volume22Issue:5Pages:1857-1866
AbstractResponses of grassland carbon (C) cycling to climate change and land use remain a major uncertainty in model prediction of future climate. To explore the impacts of global change on ecosystem C fluxes and the consequent changes in C storage, we have conducted a field experiment with warming (+3 degrees C), altered precipitation (doubled and halved), and annual clipping at the end of growing seasons in a mixed-grass prairie in Oklahoma, USA, from 2009 to 2013. Results showed that although ecosystem respiration (ER) and gross primary production (GPP) negatively responded to warming, net ecosystem exchange of CO2 (NEE) did not significantly change under warming. Doubled precipitation stimulated and halved precipitation suppressed ER and GPP equivalently, with the net outcome being unchanged in NEE. These results indicate that warming and altered precipitation do not necessarily have profound impacts on ecosystem C storage. In addition, we found that clipping enhanced NEE due to a stronger positive response of GPP compared to ER, indicating that clipping could potentially be an effective land practice that could increase C storage. No significant interactions between warming, altered precipitation, and clipping were observed. Meanwhile, we found that belowground net primary production (BNPP) in general was sensitive to climate change and land use though no significant changes were found in NPP across treatments. Moreover, negative correlations of the ER/GPP ratio with soil temperature and moisture did not differ across treatments, highlighting the roles of abiotic factors in mediating ecosystem C fluxes in this grassland. Importantly, our results suggest that belowground C cycling (e.g., BNPP) could respond to climate change with no alterations in ecosystem C storage in the same period.
SubtypeJournal
Keywordaltered precipitation clipping ecosystem respiration grasslands gross primary production net ecosystem exchange net primary production warming
Subject AreaBiodiversity & Conservation ; Environmental Sciences & Ecology
WOS Subject ExtendedBiodiversity Conservation ; Ecology ; Environmental Sciences
WOS KeywordNET PRIMARY PRODUCTIVITY ; ECOSYSTEM CARBON ; TALLGRASS PRAIRIE ; TEMPERATE STEPPE ; INTERANNUAL VARIABILITY ; WATER DYNAMICS ; PLANT-GROWTH ; CO2 FLUXES ; LAND-USE ; EXCHANGE
Indexed BySCI
Language英语
WOS IDWOS:000373130700014
PublisherWILEY-BLACKWELL
Citation statistics
Cited Times:10[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.igsnrr.ac.cn/handle/311030/44250
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
Xu, X,Shi, Z,Chen, XC,et al. Unchanged carbon balance driven by equivalent responses of production and respiration to climate change in a mixed-grass prairie[J]. GLOBAL CHANGE BIOLOGY,2016,22(5):1857-1866.
APA Xu, X.,Shi, Z.,Chen, XC.,Lin, Y.,Niu, SL.,...&Luo, YQ.(2016).Unchanged carbon balance driven by equivalent responses of production and respiration to climate change in a mixed-grass prairie.GLOBAL CHANGE BIOLOGY,22(5),1857-1866.
MLA Xu, X,et al."Unchanged carbon balance driven by equivalent responses of production and respiration to climate change in a mixed-grass prairie".GLOBAL CHANGE BIOLOGY 22.5(2016):1857-1866.
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