Performance of tropical forest seedlings under shade and drought: an interspecific trade-off in demographic responses
Performance of tropical forest seedlings under shade and drought: an interspecific trade-off in demographic responses
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DOI：
10.1038/s41598-019-55256-x
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发表时间：
2019-12-11
影响因子：
4.6
通讯作者：
Rueger, Nadja
中科院分区：
文献类型：
--
作者：
Kupers, Stefan J.;Wirth, Christian;Rueger, Nadja
在潮湿的热带森林中，幼苗必须科普深深的阴影和季节性干旱。然而，幼苗在遮荫和干旱的表现之间的种间关系仍然不确定。我们量化的时空变化的阴影和干旱的季节性潮湿的热带森林巴罗科罗拉多岛（BCI），巴拿马，估计自然再生幼苗的性能和阴影或干旱强度之间的关系的斜率的反应。我们的表现指标是相对身高增长和第一年生存率。我们调查了多达63种植物的遮荫和干旱反应之间的关系。有一个种间权衡的物种响应遮荫与物种响应旱季强度;在阴凉处表现较差的物种没有遭受严重的旱季，反之亦然。这种权衡的部分原因是缺乏在干旱和阴影下表现特别好或特别差的物种。如果热带森林的干旱压力随着气候变化而增加，而且干旱期间太阳辐射更高，这种权衡可能会加强向抗旱但在树荫下表现不佳的物种的转变，将它们从深荫中释放出来。
Seedlings in moist tropical forests must cope with deep shade and seasonal drought. However, the interspecific relationship between seedling performance in shade and drought remains unsettled. We quantified spatiotemporal variation in shade and drought in the seasonal moist tropical forest on Barro Colorado Island (BCI), Panama, and estimated responses of naturally regenerating seedlings as the slope of the relationship between performance and shade or drought intensity. Our performance metrics were relative height growth and first-year survival. We investigated the relationship between shade and drought responses for up to 63 species. There was an interspecific trade-off in species responses to shade versus species responses to dry season intensity; species that performed worse in the shade did not suffer during severe dry seasons and vice versa. This trade-off emerged in part from the absence of species that performed particularly well or poorly in both drought and shade. If drought stress in tropical forests increases with climate change and as solar radiation is higher during droughts, the trade-off may reinforce a shift towards species that resist drought but perform poorly in the shade by releasing them from deep shade.