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The relative controls of temperature and soil moisture on the start of carbon flux phenology and net ecosystem production in two alpine meadows on the Qinghai-Tibetan Plateau
Chai, Xi1,2; Shi, Peili1; Song, Minghua1; Zong, Ning1; He, Yongtao1,2; Li, Yingnian3; Zhang, Xianzhou1,2; Liu, Yanjiao4
2020-04-01
Source PublicationJOURNAL OF PLANT ECOLOGY
ISSN1752-9921
Volume13Issue:2Pages:247-255
Corresponding AuthorChai, Xi()
AbstractAims Variations in vegetation spring phenology are widely attributed to temperature in temperate and cold regions. However, temperature effect on phenology remains elusive in cold and arid/semiarid ecosystems because soil water condition also plays an important role in mediating phenology. Methods We used growing degree day (GDD) model and growing season index (GSI) model, coupling minimum temperature (T-min) with soil moisture (SM) to explore the influence of heat requirement and hydroclimatic interaction on the start of carbon uptake period (SCUP) and net ecosystem productivity (NEP) in two alpine meadows with different precipitation regimes on the Qinghai-Tibet Plateau (QTP). One is the water-limited alpine steppe-meadow, and the other is the temperature-limited alpine shrub-meadow. Important Findings We observed two clear patterns linking GDD and GSI to SCUP: SCUP was similarly sensitive to variations in preseason GDD and GSI in the humid alpine shrub-meadow, while SCUP was more sensitive to the variability in preseason GSI than GDD in the semiarid alpine steppe-meadow. The divergent patterns indicated a balance of the limiting climatic factors between temperature and water availability. In the humid meadow, higher temperature sensitivity of SCUP could maximize thermal benefit without drought stress, as evidenced by the stronger linear correlation coefficient (IV) and Akaike's information criterion (AIC) between observed SCUPs and those of simulated by GDD model. However, greater water sensitivity of SCUP could maximize the benefit of water in semiarid steppe-meadow, which is indicated by the stronger R' and AIC between observed SCUPs and those of simulated by GSI model. Additionally, although SCUPs were determined by GDD in the alpine shrub-meadow ecosystem, NFP was both controlled by accumulative GSI in two alpine meadows. Our study highlights the impacts of hydroclimatic interaction on spring carbon flux phenology and vegetation productivity in the humid and semiarid alpine ecosystems. The results also suggest that water, together with temperature should be included in the models of phenology and carbon budget for alpine ecosystems in semiarid regions. These findings have important implications for improving vegetation phenology models, thus advancing our understanding of the interplay between vegetation phenology, productivity and climate change in future.
Keywordgrowing degree day growing season index the start of carbon uptake period net ecosystem production alpine meadows Qinghai-Tibet Plateau
DOI10.1093/jpe/rtaa007
WOS KeywordSPRING PHENOLOGY ; GROWING-SEASON ; INTERANNUAL VARIABILITY ; DECIDUOUS FORESTS ; BIOCLIMATIC INDEX ; KOBRESIA MEADOW ; CO2 EXCHANGE ; VEGETATION ; CLIMATE ; STEPPE
Indexed BySCI
Language英语
Funding ProjectNational Natural Science Foundation of China[31870406] ; National Natural Science Foundation of China[41661144045] ; State Key Research and Development Program[2016YFC0502001] ; State Key Research and Development Program[2017YFA0604801]
Funding OrganizationNational Natural Science Foundation of China ; State Key Research and Development Program
WOS Research AreaPlant Sciences ; Environmental Sciences & Ecology ; Forestry
WOS SubjectPlant Sciences ; Ecology ; Forestry
WOS IDWOS:000544726900015
PublisherOXFORD UNIV PRESS
Citation statistics
Cited Times:1[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.igsnrr.ac.cn/handle/311030/162357
Collection中国科学院地理科学与资源研究所
Corresponding AuthorChai, Xi
Affiliation1.Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, Key Lab Ecosyst Network Observat & Modeling, 11A Datun Rd, Beijing 100101, Peoples R China
2.Univ Chinese Acad Sci, Coll Resources & Environm, 80 Zhongguancun East Rd, Beijing 100190, Peoples R China
3.Chinese Acad Sci, Northwest Inst Plateau Biol, 23 Xining Rd, Xining, Qinghai, Peoples R China
4.Beijing Zhongnong Futong Hort Co Ltd, 17 Qinghua East Rd, Beijing 100083, Peoples R China
Recommended Citation
GB/T 7714
Chai, Xi,Shi, Peili,Song, Minghua,et al. The relative controls of temperature and soil moisture on the start of carbon flux phenology and net ecosystem production in two alpine meadows on the Qinghai-Tibetan Plateau[J]. JOURNAL OF PLANT ECOLOGY,2020,13(2):247-255.
APA Chai, Xi.,Shi, Peili.,Song, Minghua.,Zong, Ning.,He, Yongtao.,...&Liu, Yanjiao.(2020).The relative controls of temperature and soil moisture on the start of carbon flux phenology and net ecosystem production in two alpine meadows on the Qinghai-Tibetan Plateau.JOURNAL OF PLANT ECOLOGY,13(2),247-255.
MLA Chai, Xi,et al."The relative controls of temperature and soil moisture on the start of carbon flux phenology and net ecosystem production in two alpine meadows on the Qinghai-Tibetan Plateau".JOURNAL OF PLANT ECOLOGY 13.2(2020):247-255.
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