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Determining the role of climate change in India’s past forest loss

机译:确定气候变化在印度过去森林损失中的作用

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Abstract Tropical forests in India have declined at an alarming rate over the past century, with extensive literature focusing on the high contributions of agricultural expansions to deforestation, while the effects of climate change have largely been overlooked. Climate change effects, such as increasing temperatures, drought and flooding, have already occurred, and are projected to worsen. Climate velocity, a metric that accounts for spatial heterogeneity in climate, can help identify contiguous areas under greater climate stress and potential climate refuges in addition to traditional temporal trends. Here, we examined the relative contribution of climate changes to forest loss in India during the period 2001–2018, at two spatial (regional and national) and two temporal (seasonal and annual) scales. This includes, for the first time, a characterization of climate velocity in the country. Our findings show that annual forest loss increased substantially over the 17‐year period examined (2001–2018), with the majority of forest loss occurring in the Northeast region. Decreases in temporal trends of temperature and precipitation were most associated with forest losses, but there was large spatial and seasonal variation in the relationship. In every region except the Northeast, forest losses were correlated with faster velocities of at least one climate variable but overlapping areas of high velocities were rare. Our findings indicate that climate changes have played an important role in India's past forest loss, but likely remain secondary to other factors at present. We stress concern for climates velocities recorded in the country, reaching 97 km year−1, and highlight that understanding the different regional and seasonal relationships between climatic conditions and forest distributions will be key to effective protection of the country's remaining forests as climate change accelerates.
机译:摘要 在过去的一个世纪里,印度的热带森林以惊人的速度减少,大量文献关注农业扩张对森林砍伐的巨大贡献,而气候变化的影响在很大程度上被忽视了。气候变化的影响,如气温上升、干旱和洪水,已经发生,预计还会恶化。气候速度是衡量气候空间异质性的指标,除了传统的时间趋势外,还可以帮助确定气候压力更大的毗连地区和潜在的气候避难所。在这里,我们研究了 2001-2018 年期间气候变化对印度森林损失的相对贡献,在两个空间(区域和国家)和两个时间(季节性和年度)尺度上。这包括首次对该国气候速度的表征。我们的研究结果表明,在所研究的 17 年期间(2001-2018 年),年度森林损失大幅增加,其中大部分森林损失发生在东北地区。温度和降水时间趋势的减少与森林损失的相关性最大,但这种关系在空间和季节上有很大的变化。在除东北部以外的每个地区,森林损失都与至少一个气候变量的更快速度相关,但高速重叠区域很少见。我们的研究结果表明,气候变化在印度过去的森林损失中发挥了重要作用,但目前可能仍是次要因素。我们强调对该国记录的气候速度的关注,达到97 km/year-1,并强调随着气候变化的加速,了解气候条件和森林分布之间的不同区域和季节性关系将是有效保护该国剩余森林的关键。

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