Contrasting responses of grassland water and carbon exchanges to climate change between Tibetan Plateau and Inner Mongolia
Liu, D; Li, Y; Wang, T; Peylin, P; MacBean, N; Ciais, P; Jia, GS; Ma, MG; Ma, YM; Shen, MG; Zhang, XZ; Piao, SL
2018
Source PublicationAGRICULTURAL AND FOREST METEOROLOGY
ISSN0168-1923
Volume249Pages:163-175
AbstractThe grassland ecosystems in Tibetan Plateau (TP) and Inner Mongolia (IM) of China play important roles in climate change mitigation and food and livestock production. These two regions have increasingly experienced higher temperatures and changing precipitation regimes over the past three decades. However, it remains uncertain to what extent rising temperature and varying precipitation regulate the water and carbon fluxes across alpine (TP) and temperate (IM) grasslands. Here, we first optimize a process-based model of carbon and water fluxes using eddy-covariance data (three sites in TP and six sites in IM), and analyze the simulated carbon and water fluxes based upon the optimized model exposed to a range of annual temperature and precipitation anomalies. We found that the changes in net ecosystem-atmosphere carbon exchange (NEE) of TP grassland are relatively small because the ecosystem respiration (R-e) and the gross primary productivity (GPP) increase at comparable rate with warming across multiple sites (R-e: 22.1 +/- 21.4 g C m(-2) year(-1) degrees C-1, GPP: 22.43 +/- 36.41 g C m(-2) year(-1) degrees C-1), which is due to the possibility that grasslands cannot respire more than the available supply of photosynthesis. The NEE of IM grassland increases (more carbon loss from ecosystem) with warming, which is mainly because GPP decreases faster than R-e under warm-induced reduction in moisture availability, and the sensitivity of Re to warming (1.17 +/- 3.56 g C m(-2) year(-1) degrees C-1) is much smaller than that of GPP (15.53 +/- 15.91 g C m(-2) year(-1) degrees C-1). These results indicate that water is the major limiting factor in IM grasslands, but not in TP grasslands. In contrast to warming, we found an asymmetric response of water and carbon fluxes to drying and wetting in TP grasslands (i.e. a large decrease under the drying condition and a small increase under the wetting condition) but almost a linear response in IM grasslands. We therefore highlight that the underlying processes regulating the responses of water and carbon cycles to warming are fundamentally different between TP and IM grasslands, with the moisture being the major limiting factor in IM while grasslands in TP are much more limited by thermal conditions. Our results also imply that warming would significantly stimulate the net ecosystem carbon loss to atmosphere but not significantly enhance ET in IM grasslands, which may provide a positive feedback to accelerate climate change. Inversely, warming could not significantly affect the ecosystem carbon exchange but significantly enhance ET in TP grasslands, which may provide a negative feedback to mitigate climate change in alpine grasslands.
SubtypeJournal
KeywordGrassland Climate change Tibetan Plateau Inner Mongolia ORCHIDEE model
Subject AreaAgriculture ; Forestry ; Meteorology & Atmospheric Sciences
WOS Subject ExtendedAgronomy ; Forestry ; Meteorology & Atmospheric Sciences
WOS KeywordNET ECOSYSTEM EXCHANGE ; LAND-SURFACE MODEL ; TEMPERATE STEPPE ; NORTHERN CHINA ; USE EFFICIENCY ; CO2 EXCHANGE ; SEMIARID GRASSLAND ; VEGETATION GROWTH ; DIOXIDE EXCHANGE ; ALPINE MEADOW
Indexed BySCI
Language英语
WOS IDWOS:000424180100014
PublisherELSEVIER SCIENCE BV
Citation statistics
Cited Times:17[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.igsnrr.ac.cn/handle/311030/43921
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
Liu, D,Li, Y,Wang, T,et al. Contrasting responses of grassland water and carbon exchanges to climate change between Tibetan Plateau and Inner Mongolia[J]. AGRICULTURAL AND FOREST METEOROLOGY,2018,249:163-175.
APA Liu, D.,Li, Y.,Wang, T.,Peylin, P.,MacBean, N.,...&Piao, SL.(2018).Contrasting responses of grassland water and carbon exchanges to climate change between Tibetan Plateau and Inner Mongolia.AGRICULTURAL AND FOREST METEOROLOGY,249,163-175.
MLA Liu, D,et al."Contrasting responses of grassland water and carbon exchanges to climate change between Tibetan Plateau and Inner Mongolia".AGRICULTURAL AND FOREST METEOROLOGY 249(2018):163-175.
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