Amazonian biomass burning-derived acid and nutrient deposition in the north Andean montane forest of Ecuador
Amazonian biomass burning-derived acid and nutrient deposition in the north Andean montane forest of Ecuador
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DOI：
10.1029/2007gb003158
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发表时间：
2008-11-18
影响因子：
5.2
通讯作者：
Wilcke, Wolfgang
中科院分区：
文献类型：
--
作者：
Boy, Jens;Rollenbeck, Ruetger;Wilcke, Wolfgang
我们探讨了1998年5月至2003年4月期间亚马逊流域和拉丁美洲东北部生物质燃烧对暴露于亚马逊流域的厄瓜多尔南部安第斯山地森林的N、C、P、S、K、Ca、Mg、Al、Mn和Zn循环的影响。我们评估了三个微流域（8-13公顷）的元素收支对亚马逊流域强烈燃烧季节和燃烧季节外大气沉降变化的响应。生物质燃烧过程中 H、N 和 Mn 沉积显着升高。生物质燃烧过程中氢沉降升高导致冠层和有机层的贱金属损失增加，并使植被本来就低的贱金属供应恶化。氮仅在生物质燃烧期间保留，但在非火条件下则不会保留，此时沉积量要小得多。我们得出的结论是，亚马逊流域与生物质燃烧相关的气溶胶排放量足以大幅增加亚马逊流域西缘的元素沉积。特别是酸沉积的相关增加使本已稀缺的贱金属生态系统变得更加贫乏。由于厄尔尼诺现象期间生物质燃烧最为强烈，全球变暖导致的厄尔尼诺-南方涛动周期缩短可能会增强我们研究森林的酸沉积。
We explored the influence of biomass burning in Amazonia and northeastern Latin America on N, C, P, S, K, Ca, Mg, Al, Mn, and Zn cycles of an Andean montane forest in south Ecuador exposed to the Amazon basin between May 1998 and April 2003. We assessed the response of the element budget of three microcatchments (8 - 13 ha) to the variations in atmospheric deposition between the intensive burning season and outside the burning season in Amazonia. There were significantly elevated H, N, and Mn depositions during biomass burning. Elevated H deposition during biomass burning caused elevated base metal loss from the canopy and the organic horizon and deteriorated already low base metal supply of the vegetation. N was only retained during biomass burning but not during nonfire conditions when deposition was much smaller. We conclude that biomass burning-related aerosol emissions in Amazonia are large enough to substantially increase element deposition at the western rim of Amazonia. Particularly the related increase of acid deposition impoverishes already base metal scarce ecosystems. As biomass burning is most intense during El Nino situations, a shortened El Nino - Southern Oscillation cycle because of global warming likely enhances the acid deposition at our study forest.