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Characteristics of Solar-Induced Chlorophyll Fluorescence in the Three River Headwaters Region, Qinghai-Tibetan Plateau during 2001 to 2020

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  • Jun Miao

    (School of Earth Sciences and Engineering, Hohai University, 8 Focheng West Road, Nanjing 211100, China
    School of Geography and Planning, Huaiyin Normal University, Huaian 223300, China)

  • Fei Xing

    (Department of Geography and Planning, University of Saskatchewan, 117 Science Place, Saskatoon, SK S7N 5C8, Canada)

  • Ru An

    (School of Earth Sciences and Engineering, Hohai University, 8 Focheng West Road, Nanjing 211100, China)

Abstract

The ecology of the Three River Headwaters Region (TRHR) is related to the long-term sustainable development of Qinghai Province and the whole of China. The change in chlorophyll fluorescence is an important index to measure the ecological environment. Therefore, it is of great significance to study the spatial and temporal distributions of Solar-induced chlorophyll fluorescence (SIF)and the related influencing factors in the TRHR. In this study, a high-resolution SIF dataset (2001–2020) was selected to be averaged on a time scale of years and months to investigate the annual and seasonal SIF characteristics, and the influencing climate factors were analyzed in combination with meteorological data by statistical method. The results showed that the SIF values ranged from 0.05 to 0.073 during 2001–2020, with a peak value of 0.073 in 2005 and 2009 and a minimum value of 0.05 in 2002. The averages of SIF values were higher in the source regions of the Yellow River source region (YR) and Langcang (Mekong) River source region (LCR) than in the source region of the Yangtze River source region (YZR). The SIF values of the TRHR in July, August and September were significantly higher than those in other months. The maximum value occurred in August at 0.11, and the minimum value was 0.008 in December. The precipitation had greater effect on the inter-annual variations in SIF. The monthly variation of SIF is influenced by precipitation, temperature and relative humidity. In addition, the influence of human activities and altitude on SIF should not be ignored. The results have certain reference value for protecting vegetation in the TRHR, and provide a reference for other regions to analyze the spatiotemporal changes and influencing factors by using SIF data.

Suggested Citation

  • Jun Miao & Fei Xing & Ru An, 2023. "Characteristics of Solar-Induced Chlorophyll Fluorescence in the Three River Headwaters Region, Qinghai-Tibetan Plateau during 2001 to 2020," Sustainability, MDPI, vol. 15(19), pages 1-19, September.
    • Handle: RePEc:gam:jsusta:v:15:y:2023:i:19:p:14177-:d:1247476
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    3. Xiaoping Sun & Yang Xiao, 2022. "Vegetation Growth Trends of Grasslands and Impact Factors in the Three Rivers Headwater Region," Land, MDPI, vol. 11(12), pages 1-10, December.
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