Arid
DOI10.1111/jvs.12426
Vegetation resilience to mega-drought along a typical floodplain gradient of the southern Murray-Darling Basin, Australia
Capon, Samantha J.1; Reid, Michael A.2
通讯作者Capon, Samantha J.
来源期刊JOURNAL OF VEGETATION SCIENCE
ISSN1100-9233
EISSN1654-1103
出版年2016
卷号27期号:5页码:926-937
英文摘要

Questions: How diverse and resilient is vegetation following a decade of extreme drought along a typical floodplain gradient of semi-arid south-eastern Australia? How do mechanisms of resilience (i.e. persistence and soil seed banks) vary between major plant groups and spatially with respect to habitat type and position along a flood frequency gradient?


Location: Southern Murray-Darling Basin, Australia.


Methods: We surveyed understorey vegetation and conducted germination trials to examine responses to re-wetting from soil seed banks of seven major habitat types along a typical floodplain gradient of the southern Murray-Darling Basin. We assessed abundance, species richness, functional diversity and composition, including exotic species, within and between extant and germinating assemblages.


Results: Understorey vegetation was surprisingly diverse, although low in cover, following a decade of extreme drought, with considerable numbers of plant species (61) and functional plant groups represented. Historically drier habitats, towards floodplain margins, had higher species richness and cover overall and for exotic species. Plant assemblages exhibited high heterogeneity between habitats. Soil seed banks were very dissimilar from extant vegetation, comprising mainly amphibious and damp taxa as well as some terrestrial herbs, mostly annuals. Seed banks were most abundant and diverse in intermediate floodplain habitats, and their composition was very distinct between habitat types.


Conclusions: Semi floodplain v likely to he highly resilient to prolonged drought. Plants persisting under dry conditions do not appear to rely on local soil seed banks for regeneration and may either tolerate drying in situ or arrive from neighbouring ecosystems. Soil seed banks allow understorey vegetation to respond to re-wetting, especially in intermediate floodplain habitats. Lake bed assemblages and aquatic/amphibious species lacking soil seed banks appear most vulnerable to drought. Vegetation resilience is promoted by landscape heterogeneity.


英文关键词Climate change Flow regime Germination Regeneration Soil seed banks Species richness Vegetation dynamics Wetland Zonation
类型Article
语种英语
国家Australia
收录类别SCI-E
WOS记录号WOS:000388439400007
WOS关键词SOIL SEED BANK ; MURRUMBIDGEE RIVER ; UNDERSTOREY VEGETATION ; RIPARIAN ECOSYSTEMS ; DESERT FLOODPLAIN ; CLIMATE-CHANGE ; NORTH-AMERICA ; WATER ; VARIABILITY ; FREQUENCY
WOS类目Plant Sciences ; Ecology ; Forestry
WOS研究方向Plant Sciences ; Environmental Sciences & Ecology ; Forestry
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/194871
作者单位1.Griffith Univ, Australian Rivers Inst, Nathan, Qld 4111, Australia;
2.Univ New England, Armidale, NSW 2351, Australia
推荐引用方式
GB/T 7714
Capon, Samantha J.,Reid, Michael A.. Vegetation resilience to mega-drought along a typical floodplain gradient of the southern Murray-Darling Basin, Australia[J],2016,27(5):926-937.
APA Capon, Samantha J.,&Reid, Michael A..(2016).Vegetation resilience to mega-drought along a typical floodplain gradient of the southern Murray-Darling Basin, Australia.JOURNAL OF VEGETATION SCIENCE,27(5),926-937.
MLA Capon, Samantha J.,et al."Vegetation resilience to mega-drought along a typical floodplain gradient of the southern Murray-Darling Basin, Australia".JOURNAL OF VEGETATION SCIENCE 27.5(2016):926-937.
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