Deforestation causes different subregional effects on the Amazon bioclimatic equilibrium
Deforestation causes different subregional effects on the Amazon bioclimatic equilibrium
复制标题
森林砍伐对亚马逊生物气候平衡造成不同的次区域影响
DOI：
10.1002/grl.50570
复制
发表时间：
2013
影响因子：
5.2
通讯作者：
M. H. Costa
中科院分区：
文献类型：
--
作者：
G. Pires;M. H. Costa
亚马逊流域和巴西中部塞拉多的森林砍伐可能会改变区域气候，可能将森林平衡转变为稀树草原典型的生物气候范围。尽管森林砍伐引起的气候变化的影响可能因次区域而异，但这些影响的潜在地理差异以及雨林和塞拉多砍伐影响亚马逊生物气候平衡的阈值仍然未知。我们评估了日益严重的森林砍伐情况对亚马逊次区域生物气候平衡的影响。结果表明，次区域降水以三种不同的方式对渐进式森林砍伐做出反应：近乎恒定的减少速度、低森林砍伐水平快速下降以及中等森林砍伐水平后减少。此外，虽然内部森林区域仍处于雨林生物气候范围内，但外部森林区域即使在森林砍伐水平较低的情况下也可能跨越森林-稀树草原生物气候阈值。我们认为，至少 90% 的亚马逊地区和 40% 的塞拉多地区应该得到维持，以避免次区域生物气候稀树草原化。
Deforestation on Amazonia and central Brazil Cerrado could change regional climate, possibly shifting forest equilibrium into a bioclimatic envelope typical of savannas. Although impacts of climate change induced by deforestation are likely to vary subregionally, the potential geographic variation of these effects and the thresholds of rainforest and Cerrado removal that will affect Amazonian bioclimatic equilibrium remain unknown. We evaluate the effects of deforestation scenarios of increasing severity on the bioclimatic equilibrium of Amazon subregions. Results indicate that subregional precipitation responds in three distinct ways to progressive deforestation: a near‐constant rate of reduction, a rapid drop for low deforestation levels, and a decrease after intermediate deforestation levels. Additionally, while inner forest regions remain inside rainforest bioclimatic envelope, outer forest regions may cross forest‐savanna bioclimatic threshold even at low deforestation levels. We argue that at least 90% of Amazonia and 40% of Cerrado should be sustained to avoid subregional bioclimatic savannization.