Evidence for arrested succession in a liana‐infested Amazonian forest
Evidence for arrested succession in a liana‐infested Amazonian forest
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DOI：
10.1111/1365-2745.12504
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发表时间：
2016-01
影响因子：
5.5
通讯作者：
Blaise Tymen;M. Réjou‐Méchain;J. Dalling;S. Fauset;T. Feldpausch;Natalia Norden;O. Phillips;Benjamin L Turner;J. Viers;J. Chave
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文献类型：
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作者：
Blaise Tymen;M. Réjou‐Méchain;J. Dalling;S. Fauset;T. Feldpausch;Natalia Norden;O. Phillips;Benjamin L Turner;J. Viers;J. Chave
经验证据和模型都表明，全球变化可能导致藤本植物的优势增加，从而导致热带森林中藤本植物出没的森林形成的普遍性增加。对热带森林结构和碳循环的影响仍然知之甚少。我们研究了支撑法属圭亚那藤本植物出没的森林的结构和动态的生态过程，使用长期调查（树，藤本植物，幼苗和凋落物），土壤化学分析和遥感方法（LiDAR和Landsat）的组合。在林分尺度和成年树，藤本植物出没的森林比邻近的高冠层森林有更高的生长，招聘和死亡率。总幼苗密度和树木幼苗补充量都较低的藤本植物出没的森林。藤本植物出没的森林的林分尺度地上生物量比高冠层森林低58%。地上净初级生产力（ANPP）在藤本植物出没的森林和高冠层森林中相当。然而，由于更丰富的叶生产，快速周转碳库对ANPP的相对贡献更大，在藤本植物出没的森林和碳停留时间是高冠层森林的一半。虽然藤本植物出没的森林土壤中的养分更丰富，土壤元素的比例表明，藤本植物出没的森林和高冠层森林土壤都来自相同的地质基质。因此，藤本植物出没的森林中较高的养分浓度可能是森林砍伐后植被释放养分的结果。使用小足迹激光雷达活动，我们表明，从2007年到2012年，藤本植物出没的森林的整体范围保持稳定，但约10%的森林面积的森林覆盖类型发生了变化。Landsat光学图像证实了藤本植物出没的森林在景观中至少存在了25年。合成.由于藤本植物感染森林的快速动态维持了持续的高比率，藤本植物感染森林似乎是热带森林演替的结果。如果这种停止演替的森林在未来增加，这将对亚马逊森林的碳汇潜力产生重要影响。
Empirical evidence and modelling both suggest that global changes may lead to an increased dominance of lianas and thus to an increased prevalence of liana‐infested forest formations in tropical forests. The implications for tropical forest structure and the carbon cycle remain poorly understood. We studied the ecological processes underpinning the structure and dynamics of a liana‐infested forest in French Guiana, using a combination of long‐term surveys (tree, liana, seedling and litterfall), soil chemical analyses and remote‐sensing approaches (LiDAR and Landsat). At stand scale and for adult trees, the liana‐infested forest had higher growth, recruitment and mortality rates than the neighbouring high‐canopy forest. Both total seedling density and tree seedling recruitment were lower in the liana‐infested forest. Stand scale above‐ground biomass of the liana‐infested forest was 58% lower than in the high‐canopy forest. Above‐ground net primary productivity (ANPP) was comparable in the liana‐infested and high‐canopy forests. However, due to more abundant leaf production, the relative contribution of fast turnover carbon pools to ANPP was larger in the liana‐infested forest and the carbon residence time was half that of the high‐canopy forest. Although soils of the liana‐infested forest were richer in nutrients, soil elemental ratios suggest that liana‐infested forest and high‐canopy forest soils both derive from the same geological substrate. The higher nutrient concentration in the liana‐infested forest may therefore be the result of a release of nutrients from vegetation after a forest blowdown. Using small‐footprint LiDAR campaigns, we show that the overall extent of the liana‐infested forest has remained stable from 2007 to 2012 but about 10% of the forest area changed in forest cover type. Landsat optical imagery confirms the liana‐infested forest presence in the landscape for at least 25 years. Synthesis. Because persistently high rates of liana infestation are maintained by the fast dynamics of the liana‐infested forest, liana‐infested forests here appear to be the result of an arrested tropical forest succession. If the prevalence of such arrested succession forests were to increase in the future, this would have important implications for the carbon sink potential of Amazonian forests.