Forest fragmentation impacts the seasonality of Amazonian evergreen canopies.
Forest fragmentation impacts the seasonality of Amazonian evergreen canopies.
复制标题
DOI：
10.1038/s41467-022-28490-7
复制
发表时间：
2022-02-17
影响因子：
16.6
通讯作者：
Maeda EE
中科院分区：
文献类型：
--
作者：
Nunes MH;Camargo JLC;Vincent G;Calders K;Oliveira RS;Huete A;Mendes de Moura Y;Nelson B;Smith MN;Stark SC;Maeda EE
对亚马逊森林中叶物候的大小和时间的预测仍然存在很大争议。在这里，我们使用陆地激光雷达调查，每两个星期跨越亚马逊河流域中部的雨季和旱季，显示植物物候在古老的森林中的垂直层变化很大，但对森林碎片化引起的干扰很敏感。结合连续的小气候测量，我们发现，当旱季后期日最高气温达到35 °C时，未受干扰的森林中大树的上层树冠失去了植物材料。相比之下，林下植被变绿增加的光可用性驱动的上层冠层损失，随着太阳辐射的增加，即使在干燥的土壤和大气条件。然而，在森林边缘持续高温加剧了整个旱季的上部冠层损失的大树，而在这些光线丰富的环境中的林下植被较少依赖于改变上部冠层结构。我们的研究结果揭示了强烈的影响边缘效应在亚马逊河流域中部的潮湿森林的物候控制。即使是万年青热带森林也可能有季节性的动态，这可能对干扰很敏感。在这里，作者结合联合收割机高分辨率遥感观测和小气候数据表明，森林破碎化影响树冠物候动态在亚马逊森林。
Predictions of the magnitude and timing of leaf phenology in Amazonian forests remain highly controversial. Here, we use terrestrial LiDAR surveys every two weeks spanning wet and dry seasons in Central Amazonia to show that plant phenology varies strongly across vertical strata in old-growth forests, but is sensitive to disturbances arising from forest fragmentation. In combination with continuous microclimate measurements, we find that when maximum daily temperatures reached 35 °C in the latter part of the dry season, the upper canopy of large trees in undisturbed forests lost plant material. In contrast, the understory greened up with increased light availability driven by the upper canopy loss, alongside increases in solar radiation, even during periods of drier soil and atmospheric conditions. However, persistently high temperatures in forest edges exacerbated the upper canopy losses of large trees throughout the dry season, whereas the understory in these light-rich environments was less dependent on the altered upper canopy structure. Our findings reveal a strong influence of edge effects on phenological controls in wet forests of Central Amazonia. Even evergreen tropical forests can have seasonal dynamics, which may be sensitive to disturbance. Here, the authors combine high-resolution remote sensing observations and microclimate data to show that forest fragmentation impacts canopy phenology dynamics in the Amazon forest.
登录
查看更多内容
影响因子：
5
作者：
Almeida, Danilo R. A.;Stark, Scott C.;Brancalion, Pedro H. S.
通讯作者：
Brancalion, Pedro H. S.
影响因子：
13.5
作者：
Coomes, David A.;Dalponte, Michele;Qie, Lan
通讯作者：
Qie, Lan
影响因子：
5.5
作者：
Brum, Mauro;Vadeboncoeur, Matthew A.;Oliveira, Rafael S.
通讯作者：
Oliveira, Rafael S.
DOI：
10.1073/pnas.0908741107
发表时间：
2010-08-17
影响因子：
11.1
作者：
Brando, Paulo M.;Goetz, Scott J.;Christman, Mary C.
通讯作者：
Christman, Mary C.
影响因子：
5
作者：
Alves de Almeida, Danilo Roberti;Stark, Scott C.;Santin Brancalion, Pedro Henrique
通讯作者：
Santin Brancalion, Pedro Henrique