Impacts of an Extreme Precipitation Event on Dipterocarp Mortality and Habitat Filtering in a Bornean Tropical Rain Forest

Impacts of an Extreme Precipitation Event on Dipterocarp Mortality and Habitat Filtering in a Bornean Tropical Rain Forest
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婆罗洲热带雨林极端降水事件对龙脑香死亡率和栖息地过滤的影响

DOI:
10.1111/btp.12189
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发表时间:
2015
期刊:
影响因子:
2.1
通讯作者:
Margrove J
Margrove J
中科院分区:
环境科学与生态学3区
文献类型:
--
作者:
Margrove J

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在全球气候变化的影响下,一些热带地区极端降水事件的频率预计会增加,但这种形式的扰动对异质景观中热带树木群落结构和动态的影响仍未得到充分研究。我们测定了2006年7月一次极端降水事件(EPE)对沙巴州西皮洛克森林保护区68公顷永久盘存样地双龙科植物死亡率的影响。当茎干≥30 cm dbh时,该样地15种梁木科植物中有12种与地形和土壤类型的生境存在显著的正相关和负相关关系。在冲积洪泛区生长的个体的短期死亡率(13.7%)远高于泥岩生境(1.4%)或砂岩生境(0.0%),但在随后的5年时间间隔内,这些生境中的龙心科植物的死亡率没有差异。对EPE响应的死亡率最高的是一小群快速生长的龙心科植物,它们具有低的木材密度和与冲积林栖息地的强烈联系。这组物种代表了高百分比的双香果个体,但在该栖息地双香果多样性中所占的比例很低。我们的结论是,强降雨事件引起的干扰有助于热带森林动态的偶发性,这些事件频率的增加将不成比例地影响低洼冲积林环境和其中生长的一些物种。
The frequency of extreme precipitation events is predicted to increase in some tropical regions in response to global climate change, but the impacts of this form of disturbance on the structure and dynamics of tropical tree communities across heterogeneous landscapes remain understudied. We determined the effects of an extreme precipitation event (EPE) in July 2006 on mortality of dipterocarps on a 68 ha permanent inventory plot in Sepilok Forest Reserve, Sabah. For stems ≥30 cm dbh, 12 of the 15 species of Dipterocarpaceae on this plot have significant positive and/or negative associations to habitats defined by topography and soil type. Short‐term mortality induced by the EPE was much greater for individuals growing on the alluvial floodplain (13.7%) than in the mudstone (1.4%) or sandstone (0.0%) habitats, but mortality of dipterocarps did not differ among these habitats in the subsequent 5‐yr interval. The likelihood of mortality in response to the EPE was highest for a small group of fast growing dipterocarps that possess low wood density and a strong association to the alluvial forest habitat. This group of species represents a high percentage of dipterocarp individuals but a low proportion of dipterocarp diversity in this habitat. We conclude that disturbance induced by high rainfall events contributes to the episodic nature of tropical forest dynamics, and that increases in the frequency of these events would disproportionately impact low‐lying alluvial forest environments and some of the species growing in them.
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