气候变化领域集成服务门户(CCPortal): Estimation of Net Ecosystem Productivity on the Tibetan Plateau Grassland from 1982 to 2018 Based on Random Forest Model

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DOI	10.3390/rs15092375
	Estimation of Net Ecosystem Productivity on the Tibetan Plateau Grassland from 1982 to 2018 Based on Random Forest Model
	Zheng, Jiahe; Zhang, Yangjian; Wang, Xuhui; Zhu, Juntao; Zhao, Guang; Zheng, Zhoutao; Tao, Jian; Zhang, Yu; Li, Ji
发表日期	2023
EISSN	2072-4292
卷号	15 期号:9
英文摘要	The Tibetan Plateau (TP) is one of the most important areas for the study of the carbon budgets of terrestrial ecosystems. However, the estimation of the net ecosystem productivity (NEP) remains uncertain in this region due to its complex topographic properties and climatic conditions. Using CO2-eddy-covariance-flux data from 1982 to 2018 at 18 sites distributed around the TP grassland, we analyzed the spatial-temporal patterns of the grassland NEP and its driving factors from 1982 to 2018 using a random forest (RF) model. Our results showed that the RF model captured the size of the carbon sink (R-2 = 0.65, p < 0.05) between the observed and simulated values for the validation samples. During the observation period, the grassland acted as a carbon sink of 26.2 Tg C yr(-1) and increased significantly, by 0.4 g C m(-2) yr(-1). On a regional scale, the annual NEP gradually increased from the northwest to the southeast, and a similar pattern was also observed in the long-term trends. Furthermore, the moisture conditions, such as the specific humidity and precipitation, were proven to be the main driving factors of the carbon flux in the southeastern areas, while the temperature predominantly controlled the carbon flux in the northwest. Our results emphasize the net carbon sink of the TP and provide a reliable way to upscale NEP from sites.
关键词	climate change grassland net ecosystem productivity random forest model Tibetan Plateau
英文关键词	EDDY-COVARIANCE MEASUREMENTS; TERRESTRIAL CARBON FLUXES; GROSS PRIMARY PRODUCTION; ALPINE MEADOW; INTERANNUAL VARIABILITY; DIFFERENTIAL RESPONSE; DIOXIDE EXCHANGE; ATMOSPHERIC CO2; WATER-VAPOR; CLIMATE
WOS研究方向	Environmental Sciences ; Geosciences, Multidisciplinary ; Remote Sensing ; Imaging Science & Photographic Technology
WOS记录号	WOS:000987818300001
来源期刊	REMOTE SENSING
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/283803
作者单位	Chinese Academy of Sciences; Institute of Geographic Sciences & Natural Resources Research, CAS; Chinese Academy of Sciences; University of Chinese Academy of Sciences, CAS; Chinese Academy of Sciences; Peking University; Shandong Technology & Business University; China University of Geosciences - Wuhan
推荐引用方式 GB/T 7714	Zheng, Jiahe,Zhang, Yangjian,Wang, Xuhui,et al. Estimation of Net Ecosystem Productivity on the Tibetan Plateau Grassland from 1982 to 2018 Based on Random Forest Model[J],2023,15(9).
APA	Zheng, Jiahe.,Zhang, Yangjian.,Wang, Xuhui.,Zhu, Juntao.,Zhao, Guang.,...&Li, Ji.(2023).Estimation of Net Ecosystem Productivity on the Tibetan Plateau Grassland from 1982 to 2018 Based on Random Forest Model.REMOTE SENSING,15(9).
MLA	Zheng, Jiahe,et al."Estimation of Net Ecosystem Productivity on the Tibetan Plateau Grassland from 1982 to 2018 Based on Random Forest Model".REMOTE SENSING 15.9(2023).