Concurrent and Lagged Effects of Extreme Drought Induce Net Reduction in Vegetation Carbon Uptake on Tibetan Plateau

doi:10.3390/rs12152347

	Concurrent and Lagged Effects of Extreme Drought Induce Net Reduction in Vegetation Carbon Uptake on Tibetan Plateau
	Ye, Chongchong 1,2; Sun, Jian 1; Liu, Miao 1; Xiong, Junnan 2; Zong, Ning 1; Hu, Jian 3; Huang, Yong 4; Duan, Xingwu 4; Tsunekawa, Atsushi 5
刊名	REMOTE SENSING
	2020-08-01
卷号	12 期号:15 页码:19
关键词	extreme drought net reduction in vegetation carbon uptake concurrent and lagged effects recovery time
DOI	10.3390/rs12152347
通讯作者	Sun, Jian(sunjian@igsnrr.ac.cn)
英文摘要	Climatic extremes have adverse concurrent and lagged effects on terrestrial carbon cycles. Here, a concurrent effect refers to the occurrence of a latent impact during climate extremes, and a lagged effect appears sometime thereafter. Nevertheless, the uncertainties of these extreme drought effects on net carbon uptake and the recovery processes of vegetation in different Tibetan Plateau (TP) ecosystems are poorly understood. In this study, we calculated the Standardised Precipitation-Evapotranspiration Index (SPEI) based on meteorological datasets with an improved spatial resolution, and we adopted the Carnegie-Ames-Stanford approach model to develop a net primary production (NPP) dataset based on multiple datasets across the TP during 1982-2015. On this basis, we quantised the net reduction in vegetation carbon uptake (NRVCU) on the TP, investigated the spatiotemporal variability of the NPP, NRVCU and SPEI, and analysed the NRVCUs that are caused by the concurrent and lagged effects of extreme drought and the recovery times in different ecosystems. According to our results, the Qaidam Basin and most forest regions possessed a significant trend towards drought during 1982-2015 (withSlopeof SPEI < 0,P< 0.05), and the highest frequency of extreme drought events was principally distributed in the Qaidam Basin, with three to six events. The annual total net reduction in vegetation carbon uptake on the TP experienced a significant downward trend from 1982 to 2015 (-0.0018 +/- 0.0002 PgC year(-1),P< 0.001), which was negatively correlated with annual total precipitation and annual mean temperature (P< 0.05). In spatial scale, the NRVCU decrement was widely spread (approximately 55% of grids) with 17.86% of the area displaying significant declining trends (P< 0.05), and the sharpest declining trend (Slope <= -2) was mainly concentrated in southeastern TP. For the alpine steppe and alpine meadow ecosystems, the concurrent and lagged effects of extreme drought induced a significant difference in NRVCU (P< 0.05), while forests presented the opposite results. The recovery time comparisons from extreme drought suggest that forests require more time (27.62% of grids >= 6 years) to recover their net carbon uptakes compared to grasslands. Therefore, our results emphasise that extreme drought events have stronger lagged effects on forests than on grasslands on the TP. The improved resilience of forests in coping with extreme drought should also be considered in future research.
资助项目	Second Tibetan Plateau Scientific Expedition and Research[2019QZKK0405] ; National Natural Science Foundation of China[41871040] ; Science and Technology Project of Xizang Autonomous Region[XZ201901-GA-07]
WOS关键词	PRIMARY PRODUCTIVITY ; CLIMATE EXTREMES ; RIVER-BASIN ; FOREST ; GRASSLAND ; ECOSYSTEM ; RESPONSES ; FLUXES ; IMPACT ; SOIL
WOS研究方向	Remote Sensing
语种	英语
出版者	MDPI
WOS记录号	WOS:000559081500001
资助机构	Second Tibetan Plateau Scientific Expedition and Research ; National Natural Science Foundation of China ; Science and Technology Project of Xizang Autonomous Region
内容类型	期刊论文
源URL	[http://ir.igsnrr.ac.cn/handle/311030/158114]
专题	中国科学院地理科学与资源研究所
通讯作者	Sun, Jian
作者单位	1.Chinese Acad Sci, Synth Res Ctr Chinese Ecosyst Res Network, Inst Geog Sci & Nat Resources Res, Beijing 100101, Peoples R China 2.Southwest Petr Univ, Sch Civil Engn & Geomat, Chengdu 610500, Peoples R China 3.Southwest Minzu Univ, Inst Qinghai Tibetan Plateau, Chengdu 610041, Peoples R China 4.Yunnan Univ, Inst Int Rivers & Ecosecur, Kunming 650091, Yunnan, Peoples R China 5.Tottori Univ, Arid Land Res Ctr, Tottori 6800001, Japan
推荐引用方式 GB/T 7714	Ye, Chongchong,Sun, Jian,Liu, Miao,et al. Concurrent and Lagged Effects of Extreme Drought Induce Net Reduction in Vegetation Carbon Uptake on Tibetan Plateau[J]. REMOTE SENSING,2020,12(15):19.
APA	Ye, Chongchong.,Sun, Jian.,Liu, Miao.,Xiong, Junnan.,Zong, Ning.,...&Tsunekawa, Atsushi.(2020).Concurrent and Lagged Effects of Extreme Drought Induce Net Reduction in Vegetation Carbon Uptake on Tibetan Plateau.REMOTE SENSING,12(15),19.
MLA	Ye, Chongchong,et al."Concurrent and Lagged Effects of Extreme Drought Induce Net Reduction in Vegetation Carbon Uptake on Tibetan Plateau".REMOTE SENSING 12.15(2020):19.