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
文献类型：期刊论文
| 作者 | Chai, Xi1,2; Shi, Peili1; Song, Minghua1; Zong, Ning1; He, Yongtao1,2; Li, Yingnian3; Zhang, Xianzhou1,2; Liu, Yanjiao4 |
| 刊名 | JOURNAL OF PLANT ECOLOGY
 |
| 出版日期 | 2020-04-01 |
| 卷号 | 13期号:2页码:247-255 |
| 关键词 | growing degree day growing season index the start of carbon uptake period net ecosystem production alpine meadows Qinghai-Tibet Plateau |
| ISSN号 | 1752-9921 |
| DOI | 10.1093/jpe/rtaa007 |
| 通讯作者 | Chai, Xi() |
| 英文摘要 | Aims 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. |
| WOS关键词 | SPRING PHENOLOGY ; GROWING-SEASON ; INTERANNUAL VARIABILITY ; DECIDUOUS FORESTS ; BIOCLIMATIC INDEX ; KOBRESIA MEADOW ; CO2 EXCHANGE ; VEGETATION ; CLIMATE ; STEPPE |
| 资助项目 | National 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] |
| WOS研究方向 | Plant Sciences ; Environmental Sciences & Ecology ; Forestry |
| 语种 | 英语 |
| WOS记录号 | WOS:000544726900015 |
| 出版者 | OXFORD UNIV PRESS |
| 资助机构 | National Natural Science Foundation of China ; State Key Research and Development Program |
| 源URL | [http://ir.igsnrr.ac.cn/handle/311030/162356]  |
| 专题 | 中国科学院地理科学与资源研究所 |
| 通讯作者 | Chai, Xi |
| 作者单位 | 1.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 |
| 推荐引用方式 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. |
入库方式： OAI收割
来源：地理科学与资源研究所
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