干旱区生态环境知识资源中心(Arid): Mechanisms behind persistence of a fire-sensitive alternative stable state system in the Gibson Desert, Western Australia

Arid

DOI	10.1007/s00442-019-04474-1
	Mechanisms behind persistence of a fire-sensitive alternative stable state system in the Gibson Desert, Western Australia
	Wright, Boyd R.1,2,3; Albrecht, David E.4; Silcock, Jennifer L.5; Hunter, John 1; Fensham, Roderick J.5,6
通讯作者	Wright, Boyd R.
来源期刊	OECOLOGIA
ISSN	0029-8549
EISSN	1432-1939
出版年	2019
卷号	191 期号:1 页码:165-175
英文摘要	Alternative vegetation types that switch from one to another under contrasting fire regimes are termed fire-mediated alternative stable states (FMASS). Typically, pyrophylic communities (i.e., vegetation assemblages favored by burning) dominate under high frequencies or intensities of fire. Conversely, fire-sensitive (pyrophobic) vegetation types persist under long fire-free conditions. As the persistence traits of plants of FMASS systems are generally poorly researched, threshold levels of pyric disturbance that trigger 'state-switching' are often unknown. Dense thickets of the obligate-seeder shrub waputi (Aluta maisonneuvei ssp. maisonneuvei [Myrtaceae]) form fire-retarding woody islands within highly flammable spinifex (Triodia spp.) grasslands in arid Australia. To examine the tolerance of Aluta thickets to burning, we investigated: (1) the influence of post-fire rainfall and fire severity on recruitment (a field study); (2) soil seedbank densities (a field study); and (3) fire-related dormancy cues in seeds (a germination trial). We found a positive relationship between recruitment and post-fire rainfall volume, and much higher mean recruitment at sites with high- (5.9 seedlings/m2) than low-severity-burnt (2.2 seedlings/m2) and unburnt shrubs (0.03 seedlings/m2). Post-fire regeneration was mediated by dense soil-borne seedbanks, and the germination trial indicated that smoke promoted germination. Although Aluta shrubs are invariably fire-killed, high-severity fires are unlikely to lead to state shifts from shrubland to grassland because of the ability of mature stands to regenerate from dense, fire-cued seedbanks. Nevertheless, given that Aluta seedlings are exceptionally slow-growing, post-fire droughts combined with fire-return intervals less than the Aluta primary juvenile period of c. 5 years could drive conversion from Aluta- to Triodia-dominated vegetation.
英文关键词	Arid zone Alternative stable states Ecotone Fire ecology Obligate seeder
类型	Article
语种	英语
国家	Australia
收录类别	SCI-E
WOS记录号	WOS:000484956600014
WOS关键词	SOIL TEMPERATURES ; SEED PREDATION ; FREQUENT FIRE ; RAIN-FOREST ; VEGETATION ; FEEDBACKS ; DROUGHT ; RESILIENCE ; SEVERITY ; SURVIVAL
WOS类目	Ecology
WOS研究方向	Environmental Sciences & Ecology
来源机构	Commonwealth Scientific and Industrial Research Organisation
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/217811
作者单位	1.Univ New England, Sch Environm & Rural Sci, 3 Thompson St, Armidale, NSW 2350, Australia; 2.Northern Terr Herbarium, Dept Land Resource Management, Alice Springs, NT 0871, Australia; 3.Univ Queensland, Sch Agr & Food Sci, Brisbane, Qld 4072, Australia; 4.CSIRO, Ctr Australian Natl Biodivers Res, Australian Natl Herbarium, GPO Box 1700, Canberra, ACT 2601, Australia; 5.Univ Queensland, Sch Biol Sci, Brisbane, Qld 4072, Australia; 6.Queensland Herbarium, Mt Coot Tha Rd, Brisbane, Qld 4066, Australia
推荐引用方式 GB/T 7714	Wright, Boyd R.,Albrecht, David E.,Silcock, Jennifer L.,et al. Mechanisms behind persistence of a fire-sensitive alternative stable state system in the Gibson Desert, Western Australia[J]. Commonwealth Scientific and Industrial Research Organisation,2019,191(1):165-175.
APA	Wright, Boyd R.,Albrecht, David E.,Silcock, Jennifer L.,Hunter, John,&Fensham, Roderick J..(2019).Mechanisms behind persistence of a fire-sensitive alternative stable state system in the Gibson Desert, Western Australia.OECOLOGIA,191(1),165-175.
MLA	Wright, Boyd R.,et al."Mechanisms behind persistence of a fire-sensitive alternative stable state system in the Gibson Desert, Western Australia".OECOLOGIA 191.1(2019):165-175.