DOI: 10.1016/j.quascirev.2013.12.014
Scopus记录号: 2-s2.0-84892884525
论文题名: Abundant C4 plants on the Tibetan Plateau during the Lateglacial and early Holocene
作者: Thomas E.K. ; Huang Y. ; Morrill C. ; Zhao J. ; Wegener P. ; Clemens S.C. ; Colman S.M. ; Gao L.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2014
卷: 87 起始页码: 24
结束页码: 33
语种: 英语
英文关键词: C4 photosynthesis
; Carbon isotope
; Leaf wax
; Monsoon
; Paleoecology
; Tibetan Plateau
Scopus关键词: Carbon isotopes
; Environmental conditions
; Environmental factors
; Monsoon
; Northeastern tibetan plateaux
; Paleoecology
; Photosynthetic pathways
; Tibetan Plateau
; Carbon
; Computer simulation
; Ecosystems
; Isotopes
; Lakes
; Photosynthesis
; Phytoplankton
; C (programming language)
; abundance
; climate effect
; ecosystem modeling
; environmental conditions
; Holocene
; late glacial
; paleoecology
; photosynthesis
; plant community
; primary production
; seasonal variation
; China
; Qinghai-Xizang Plateau
英文摘要: Plants using the C4 (Hatch-Slack) photosynthetic pathway are key for global food production and account for ca25% of terrestrial primary productivity, mostly in relatively warm, dry regions. The discovery of modern naturally-occurring C4 plant species at elevations up to 4500m in Tibet and 3000m in Africa and South America, however, suggests that C4 plants are present in a wider range of environments than previously thought. Environmental conditions on the Tibetan Plateau, including high irradiance, rainfall focused in summer, and saline soils, can favor C4 plants by offsetting the deleterious effects of low growing season temperature. We present evidence based on leaf wax carbon isotope ratios from Lake Qinghai that C4 plants accounted for 50% of terrestrial primary productivity on the northeastern Tibetan Plateau throughout the Lateglacial and early Holocene. Despite cold conditions, C4 plants flourished due to a combination of factors, including maximum summer insolation, pCO2 ca250ppmv, and sufficient summer precipitation. The modern C3 plant-dominated ecosystem around Lake Qinghai was established ca6 thousand years ago as pCO2 increased and summer temperature and precipitation decreased. C4 plants were also intermittently abundant during the Last Glacial period; we propose that C4 plants contributed a significant portion of local primary productivity by colonizing the exposed, saline Qinghai Lake bed during low stands. Our results contrast with state-of-the-art ecosystem models that simulate <0.5% C4 plant abundance on the Tibetan Plateau in modern and past environments. The past abundance of C4 plants on the Tibetan Plateau suggests a wider temperature range for C4 plants than can be inferred from modern distributions and model simulations, and provides paleoecological evidence to support recent findings that C4 plant evolution and distribution was determined by a combination of climatic and environmental factors (temperature, irradiance, precipitation amount and seasonality, and soil salinity). Moreover, this finding highlights the exceptional sensitivity of high-elevation ecosystems to environmental change, and provides critical benchmarks for ecosystem model validation. © 2013 Elsevier Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/60372
Appears in Collections: 过去全球变化的重建
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作者单位: Department of Geological Sciences, Brown University, Box 1846, Providence, RI 02912, United States; Cooperative Institute for Research in Environmental Sciences, University of Colorado, NOAA National Climatic Data Center, Boulder CO 80305, United States; State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences, Xi'an 710075, China; Large Lake Observatory, University of Minnesota, Duluth, MN 55812, United States; GeoIsoChem Corporation, 738 Arrow Grand Circle, Covina, CA 91722, United States
Recommended Citation:
Thomas E.K.,Huang Y.,Morrill C.,et al. Abundant C4 plants on the Tibetan Plateau during the Lateglacial and early Holocene[J]. Quaternary Science Reviews,2014-01-01,87