基于MODIS/NDVI的云南省2009-2010干旱遗产效应研究
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北京林业大学水土保持学院

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Study on the drought legacy effects of 2009-2010 based on MODIS / NDVI in Yunnan Province
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1.北京林业大学水土保持学院;2.School of soil and water conservation, Beijing Forestry University

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    摘要:

    气候变化正导致干旱事件发生的强度、频度显著改变,极端气候事件发生的不确定性直接影响陆地生态系统关键生态过程。我国西南地区在2009-2010年发生百年一遇的极端干旱,目前关于植被在长时间尺度对此次干旱事件的响应尚不明确。本文以云南省为研究区,基于多年Normalized difference vegetation index(NDVI)影像数据以及长时间序列气象资料对此次极端事件的干旱遗产效应开展研究,分析了干旱遗产效应的持续时间以及不同植被类型的响应差异。结果表明:1)云南省植被生长在极端干旱事件发生后受到的抑制时间大约持续1-2年,受影响区域主要集中在遭遇降水严重减少的地区;2)海拔2000 m附近为植被对干旱响应最为敏感的区域,海拔高于4000 m的植被生长几乎未受到干旱影响;3)较之草地和农田,森林植被受到的抑制作用更为强烈。研究初步揭示了极端干旱对云南省植被生长造成的影响,为该地区未来应对极端干旱并有效开展植被恢复提供理论依据。

    Abstract:

    Climate change is leading to significant variations in the intensity and frequency of drought events, and the key ecological processes of terrestrial ecosystems are directly affected by the uncertainty of extreme climate events. In 2009-2010, Southwest China experienced a once-in-a-hundred-year extreme drought, however, the responses of vegetation to this extreme drought event on a long-term time scale is still unclear. Using multi-year normalized difference vegetation index(NDVI)data and meteorological datasets, the duration of legacy effect of 2009-2010 extreme drought in Yunnan Province were studied and the responses of diverse vegetation types on this extreme drought event were analyzed. The results showed that 1)The inhibition of vegetation growth occurred about 1-2 years in Yunnan Province after the extreme drought event, especially in areas where precipitation experienced a severe reduction. 2)The most sensitive area of vegetation response to drought events is around 2000 m above sea level, and the vegetation growth above 4000 m is almost unaffected. 3)Compared with grassland and farmland, the inhibition of forest vegetation is stronger. This research revealed the negative impacts of extreme drought on the growth of vegetation in Yunnan Province and provided a theoretical basis for coping with extreme drought and restoring vegetation effectively in the future.

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董伯纲,于洋,吴秀芹.基于MODIS/NDVI的云南省2009-2010干旱遗产效应研究.生态学报,,(). http://dx. doi. org/10.5846/stxb202012283296

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