Arid
DOI10.1016/j.jaridenv.2018.03.006
Vegetation and seed banks of arid ephemeral gilgai wetlands subject to contrasting grazing regimes
Davies, Richard J. -P.1,2; Mackay, Duncan A.1; Whalen, Molly A.1; Smyth, Anita K.2,3
通讯作者Davies, Richard J. -P.
来源期刊JOURNAL OF ARID ENVIRONMENTS
ISSN0140-1963
EISSN1095-922X
出版年2018
卷号154页码:51-60
英文摘要

Ephemeral gilgai wetlands of the stony-plains of arid Australia have a relatively high diversity of native plant species and are extensively utilised for livestock grazing. We sampled the standing vegetation (SV) and germinable soil seed bank (SSB) of 40 gilgais, comparing gilgais near and far from watering points, and continually stocked versus rarely stocked. Despite historically heavy stock grazing, we found no significant differences in native species richness between treatments, indicating the general resilience of gilgai vegetation. One contributing factor is the abundance of Atriplex nummularia ssp. omissa. Cover of this long-lived shrub did not differ significantly between treatments and was positively correlated with "highly palatable" species’ cover, suggesting that it may act as a nurse species. In contrast, two other long-lived species, Atriplex vesicaria and Astrebla pectinate, had significantly reduced cover or were absent near to watering points. These and other long-lived species had a poorly developed SSB and thus limited ability to regenerate from seed if killed by sustained heavy grazing. The absence of fifteen locally rare species (including 12 short-lived species) from water-near gilgais indicates the need for more intensive survey to determine whether the proliferation of watering points poses a threat to such species.


英文关键词Seasonal variation Palatability Rangeland condition Facilitation Drought Grazing impact
类型Article
语种英语
国家Australia
收录类别SCI-E
WOS记录号WOS:000432764800007
WOS关键词SOUTH-AUSTRALIA ; CHENOPOD SHRUBLANDS ; LOCAL EXTINCTION ; RANGELANDS ; SHRUBS ; LANDS ; WATER ; INDICATORS ; MANAGEMENT ; GRASSLAND
WOS类目Ecology ; Environmental Sciences
WOS研究方向Environmental Sciences & Ecology
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/210558
作者单位1.Flinders Univ South Australia, Sch Biol Sci, GPO Box 2100, Adelaide, SA 5001, Australia;
2.CSIRO Sustainable Ecosyst, POB 2111, Alice Springs, NT 8701, Australia;
3.Univ Adelaide, TERN, Adelaide, SA 5005, Australia
推荐引用方式
GB/T 7714
Davies, Richard J. -P.,Mackay, Duncan A.,Whalen, Molly A.,et al. Vegetation and seed banks of arid ephemeral gilgai wetlands subject to contrasting grazing regimes[J],2018,154:51-60.
APA Davies, Richard J. -P.,Mackay, Duncan A.,Whalen, Molly A.,&Smyth, Anita K..(2018).Vegetation and seed banks of arid ephemeral gilgai wetlands subject to contrasting grazing regimes.JOURNAL OF ARID ENVIRONMENTS,154,51-60.
MLA Davies, Richard J. -P.,et al."Vegetation and seed banks of arid ephemeral gilgai wetlands subject to contrasting grazing regimes".JOURNAL OF ARID ENVIRONMENTS 154(2018):51-60.
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