标題: Distinguishing the impacts of climate change and anthropogenic factors on vegetation dynamics in the Yangtze River Basin, China

作者: Qu, S (Qu, Sai); Wang, LC (Wang, Lunche); Lin, AW (Lin, Aiwen); Yu, DQ (Yu, Deqing); Yuan, MX (Yuan, Moxi); Li, CA (Li, Chang'an)

來源出版物: ECOLOGICAL INDICATORS  卷: 108  文獻号: UNSP 105724  DOI: 10.1016/j.ecolind.2019.105724  出版年: JAN 2020  

摘要: Assessing and attributing vegetation dynamics can provide essential information for environmental resources management, particularly for those regions with fragile ecosystems. The Yangtze River Basin (YRB), a region of pivotal importance to the ecological balance and security of China, has experienced dramatic changes in environment and landscape driven by climate change and human activities, especially afforestation projects in recent years. vet how the driving factors contribute quantitatively to vegetation dynamics is not well established. Here we investigate spatiotemporal variability of vegetation coverage in terms of the Enhanced Vegetation Index (EVI) over 2001-2015, and analyze the actual influences of various climatic factors on EVI inter-annual variations. Further analysis quantifies the contributions of climate change and anthropogenic factors to EVI inter-annual variations. The results show that over the 15-year period, the average EVI demonstrated fluctuations but denoted a generally upward trend, with an increasing rate of 0.0027/a. According to the Hurst exponent analysis, areas with consistent improvement were primarily concentrated in Hunan Province and eastern Sichuan Province, where the main vegetation types are broadleaf forest and mixed forest. The average contributions of temperature, precipitation and solar radiation to EVI inter-annual variations in the YRB was 0.0041/a, 0.00012/a, and - 0.0034/a, respectively. Temperature was the controlling climate factor, with the greatest contribution to EVI inter-annual variations, while solar radiation made strong negative contributions. The average contributions of climate change and anthropogenic factors to EVI inter-annual variations were 0.0008/a and 0.0019/a, accounting for 70.37% and 29.63% of the total EVI changes respectively. Human activities, especially ecological afforestation projects, were the main driving factors improving vegetation coverage in the YRB, and the spatial distribution of forest gains was consistent with the positive contribution of human activities to the EVI trend. However, urbanization has occupied the growth space of vegetation and was a negative human-induced factor affecting vegetation growth.

入藏号: WOS:000493902400045

語言: English

文獻類型: Article

作者關鍵詞: Vegetation dynamic; Climate change; Anthropogenic activities; Attribution analysis; Yangtze River Basin

地址: [Qu, Sai; Lin, Aiwen; Yuan, Moxi] Wuhan Univ, Sch Resources & Environm Sci, Wuhan 430079, Hubei, Peoples R China.

[Wang, Lunche; Li, Chang'an] China Univ Geosci, Sch Geog & Informat Engn, Hubei Key Lab Crit Zone Evolut, Wuhan 430074, Hubei, Peoples R China.

[Yu, Deqing] Remote Sensing Ctr Hunan Prov, Changsha 410007, Hunan, Peoples R China.

通訊作者地址: Wang, LC (通訊作者)，China Univ Geosci, Sch Geog & Informat Engn, Hubei Key Lab Crit Zone Evolut, Wuhan 430074, Hubei, Peoples R China.

電子郵件地址: wang@cug.edu.cn

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