Rosa Marcos R, Brancalion Pedro H S, Crouzeilles Renato, Tambosi Leandro R, Piffer Pedro R, Lenti Felipe E B, Hirota Márcia, Santiami Edson, Metzger Jean Paul
Department of Geography, University of São Paulo, São Paulo, Brazil.
Department of Forest Sciences, Luiz de Queiroz College of Agriculture, University of São Paulo, São Paulo, Brazil.
Sci Adv. 2021 Jan 20;7(4). doi: 10.1126/sciadv.abc4547. Print 2021 Jan.
Understanding the dynamics of native forest loss and gain is critical for biodiversity conservation and ecosystem services, especially in regions experiencing intense forest transformations. We quantified native forest cover dynamics on an annual basis from 1990 to 2017 in Brazil's Atlantic Forest. Despite the relative stability of native forest cover during this period (~28 Mha), the ongoing loss of older native forests, mostly on flatter terrains, have been hidden by the increasing gain of younger native forest cover, mostly on marginal lands for mechanized agriculture. Changes in native forest cover and its spatial distribution increased forest isolation in 36.4% of the landscapes. The clearance of older forests associated with the recut of 27% of younger forests has resulted in a progressive rejuvenation of the native forest cover. We highlight the need to include native forest spatiotemporal dynamics into restoration programs to better estimate their expected benefits and unexpected problems.
了解原生林的损失和增加动态对于生物多样性保护和生态系统服务至关重要，尤其是在经历剧烈森林转型的地区。我们对1990年至2017年巴西大西洋森林的原生林覆盖动态进行了年度量化。尽管在此期间原生林覆盖相对稳定（约2800万公顷），但主要位于较平坦地形上的老龄原生林持续流失，被主要位于机械化农业边缘土地上的幼龄原生林覆盖增加所掩盖。原生林覆盖及其空间分布的变化使36.4%的景观中的森林隔离度增加。老龄森林的砍伐与27%的幼龄森林的重新砍伐相关，导致原生林覆盖逐渐年轻化。我们强调需要将原生林的时空动态纳入恢复计划，以更好地估计其预期效益和意外问题。
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