globalchange  > 气候变化与战略
DOI: 10.1016/j.agrformet.2019.107822
论文题名:
The compensation effects of post-drought regrowth on earlier drought loss across the tibetan plateau grasslands
作者: Chen N.; Zhang Y.; Zu J.; Zhu J.; Zhang T.; Huang K.; Cong N.; Wang Z.; Li J.; Zheng Z.; Tian Y.; Wang L.; Zhao G.; Liu Y.; Xu M.; Tang Z.; Zhu Y.; Chen Y.
刊名: Agricultural and Forest Meteorology
ISSN: 1681923
出版年: 2020
卷: 281
语种: 英语
英文关键词: Alpine grasslands ; Compensate ; Drought ; NEP ; NPP ; Regrowth
Scopus关键词: alpine environment ; carbon dioxide enrichment ; carbon sequestration ; drought stress ; ecosystem function ; grassland ; net primary production ; regrowth ; remote sensing ; rewetting ; traffic emission ; China ; Qinghai-Xizang Plateau
英文摘要: One-third of the global fossil fuel CO2 emissions is offset by carbon uptake of terrestrial ecosystems, while its strength is highly sensitive to drought events. It is predicted that frequencies of drought events would increase under a changing climate, which entails improving our understanding about their effects. Here, we combined direct observations at plot (experiment sites) and landscape (eddy-covariance, EC) scales with remote sensing observations at a regional scale, and evaluated the linkages between ecological resistance (summer drought loss, SDL) and resilience (post-drought regrowth, PDR). The study was conducted for an alpine grassland ecosystem on the Tibetan Plateau, which is highly vulnerable to climate changes. The results showed that alpine grasslands possess low resistance to drought. A summer drought of 2015 reduced net primary productivity (NPP) or net ecosystem productivity (NEP) by 25.4 g C m − 2, 48.6 g C m − 2 and 14.2 Tg C at the plot, landscape and regional scale relative to the baseline, respectively. In another dry summer of 2017, NEP was 11.0 g C m − 2 and 7.5 g C m − 2 lower than the baseline at the landscape and plot scale, respectively. To be noted, NEP or NPP completely recovered and exceeded the baseline due to rewetting induced PDR, compensating for the prior SDL to a certain extent. In 2015, the SDL of NEP or NPP was compensated by 39.0%, 17.3% and 10.6% due to the PDR effects at the plot, landscape and regional scale, respectively. The PDR of NEP in 2017 offset 23.6% and 70.7% of the prior SDL at the landscape and plot scale, respectively. Overall, these results demonstrated that weakened ecosystem function due to drought (e.g., low resistance) does not preclude rapid ecosystem recovery and regrowth (e.g., high resilience), which compensates for the prior loss to a certain degree. © 2019 Elsevier B.V.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/159292
Appears in Collections:气候变化与战略

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作者单位: Key Laboratory of Ecosystem Network Observation and Modeling, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing, 100101, China; University of Chinese Academy of Sciences, Beijing, 100190, China; CAS Center for Excellence in Tibetan Plateau Earth Sciences, Beijing, 100101, China; College of Resources and Environment, University of Chinese Academy of Sciences, Beijing, 100190, China; Key Laboratory of Environment Change and Resources Use in Beibu Gulf (Nanning Normal University), Ministry of Education, Nanning, China; Guangxi Key Laboratory of Earth Surface Processes and Intelligent Simulation (Nanning Normal University), Nanning, China; College of Agronomy, Shenyang Agricultural University, Shenyang, 110866, China; Peking University Shenzhen Graduate School, Shenzhen, 518055, China; International Institute for Earth System Science at Nanjing University, Nanjing, 210093, China

Recommended Citation:
Chen N.,Zhang Y.,Zu J.,et al. The compensation effects of post-drought regrowth on earlier drought loss across the tibetan plateau grasslands[J]. Agricultural and Forest Meteorology,2020-01-01,281
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