Topography shapes the structure, composition and function of tropical forest landscapes.
Topography shapes the structure, composition and function of tropical forest landscapes.
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DOI：
10.1111/ele.12964
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发表时间：
2018-07
期刊：
影响因子：
8.8
通讯作者：
Coomes DA
中科院分区：
文献类型：
--
作者：
Jucker T;Bongalov B;Burslem DFRP;Nilus R;Dalponte M;Lewis SL;Phillips OL;Qie L;Coomes DA
地形是热带森林结构和组成的关键驱动因素，因为它限制了当地树木生长所需的营养和水力条件。然而，我们还不完全了解地形驱动的森林地貌变化如何影响森林的其他新特性，如地上碳密度(ACD)。我们在婆罗洲工作，在那里，冲积山谷中70米高的森林迅速转变为养分耗竭的倾斜坡上的矮小灌木林。我们将现场数据与机载激光扫描和高光谱成像相结合，以表征地形如何塑造近15平方公里的古老森林的垂直结构、木材密度、多样性和ACD。我们发现，海拔的细微差异--它控制着土壤化学和水文--深刻地影响着树冠的结构、组成和多样性。捕捉这些过程对于解释ACD的景观规模异质性至关重要，突出了新兴遥感技术如何能够为长期存在的生态问题提供新的见解。
Topography is a key driver of tropical forest structure and composition, as it constrains local nutrient and hydraulic conditions within which trees grow. Yet, we do not fully understand how changes in forest physiognomy driven by topography impact other emergent properties of forests, such as their aboveground carbon density (ACD). Working in Borneo – at a site where 70‐m‐tall forests in alluvial valleys rapidly transition to stunted heath forests on nutrient‐depleted dip slopes – we combined field data with airborne laser scanning and hyperspectral imaging to characterise how topography shapes the vertical structure, wood density, diversity and ACD of nearly 15 km2 of old‐growth forest. We found that subtle differences in elevation – which control soil chemistry and hydrology – profoundly influenced the structure, composition and diversity of the canopy. Capturing these processes was critical to explaining landscape‐scale heterogeneity in ACD, highlighting how emerging remote sensing technologies can provide new insights into long‐standing ecological questions.
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