气候变化领域集成服务门户(CCPortal): Response of black-water floodplain (igapó) forests to flood pulse regulation in a dammed Amazonian river

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DOI	10.1016/j.foreco.2018.12.001
	Response of black-water floodplain (igapó) forests to flood pulse regulation in a dammed Amazonian river
	Lobo G.D.S.; Wittmann F.; Piedade M.T.F.
发表日期	2019
ISSN	0378-1127
起始页码	110
结束页码	118
卷号	434
英文摘要	The monomodal flood pulse of major Amazonian rivers is a seasonal phenomenon that determines ecological and biogeochemical processes in adjacent floodplain forests. River damming transforms the pattern of downstream flood pulses and provides a natural disturbance to which the native biota might be poorly adapted. Severe modifications of the flood pulse were recorded in the Uatumã River after the installation of the Balbina dam, Central Amazonia. Flood pulse regulation increased mortality of flood-adapted species in the black-water floodplain (igapó) forest. No previous studies have investigated impacts of flood pulse regulation on the species composition and forest structure of igapó forests. Therefore, we examined species composition and forest structure of igapó forests along a regulated river in comparison to a pristine tributary, the Abacate River, evaluating soil texture characteristics and flood duration. In order to assess potential encroachment of species less sensitive to flood alteration, we also inventoried adjacent non-flooded upland forest in each river section. A quantitative inventory of all trees with diameter at breast height (DBH) ≥5 cm was carried out in low-igapó, high-igapó and adjacent upland forests, totaling one half-hectare in each river. In both rivers investigated, the clay fraction of the soil was significantly related to tree height. Flood duration was correlated to DBH and basal area, with the largest trees found in low-igapó forests which are exposed to long-term flooding. Species composition, richness and diversity significantly responded to flood duration. Species richness was highest in upland forests and lowest in low-igapó forest. In the pristine river, tree species composition exhibited a turnover of species along the flooding gradient. In the regulated river, flood intensification in the low-igapó forest increased dominance of a few flood-adapted species, which produced floristic dissimilarity to all forest types investigated. On the other hand, high-igapó forest showed higher floristic similarity with upland forest due to flood suppression that contributed to encroachment of species commonly described in secondary upland forests. Our results emphasize the urgent need for Brazilian environmental regulatory agencies to incorporate downstream impacts in the environmental assessments of dam projects in the Amazon Basin. © 2018 Elsevier B.V.
英文关键词	Amazonian floodplain forests; Balbina dam; Forest structure; Regulated river; Species composition
语种	英语
scopus关键词	Banks (bodies of water); Floods; Forestry; Structure (composition); Diameter-at-breast heights; Environmental assessment; Floodplain forest; Floristic similarities; Forest structure; Regulated river; Species composition; Tree species composition; Rivers; biogeochemistry; disturbance; environmental assessment; flood; flooding; floodplain forest; floristics; forest inventory; installation; mortality; pristine environment; soil texture; species diversity; species richness; stand structure; tropical forest; upland region; Control Systems; Floods; Forestry; Forests; Rivers; Soil; Tree Dimensions; Trees; Amazon Basin; Amazonas [Brazil]; Amazonia; Balbina Reservoir; Brazil
来源期刊	Forest Ecology and Management
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/156223
作者单位	National Institute for Amazonian Research (INPA), Coordination of Environmental Studies (CDAM), Av. André Araújo 2936, Manaus, 69060-001, Brazil; Postgraduate Program in Ecology, National Institute for Amazonian Research (INPA), Av. André Araújo 2936, Manaus, 69060-001, Brazil; Institute of Floodplain Ecology, Karlsruhe Institute of Technology, Rastatt, Germany
推荐引用方式 GB/T 7714	Lobo G.D.S.,Wittmann F.,Piedade M.T.F.. Response of black-water floodplain (igapó) forests to flood pulse regulation in a dammed Amazonian river[J],2019,434.
APA	Lobo G.D.S.,Wittmann F.,&Piedade M.T.F..(2019).Response of black-water floodplain (igapó) forests to flood pulse regulation in a dammed Amazonian river.Forest Ecology and Management,434.
MLA	Lobo G.D.S.,et al."Response of black-water floodplain (igapó) forests to flood pulse regulation in a dammed Amazonian river".Forest Ecology and Management 434(2019).