干旱区生态环境知识资源中心(Arid): Global change impacts on arid zone ecosystems: Seedling establishment processes are threatened by temperature and water stress

Arid

DOI	10.1002/ece3.7638
	Global change impacts on arid zone ecosystems: Seedling establishment processes are threatened by temperature and water stress
	Lewandrowski, Wolfgang; Stevens, Jason C.; Webber, Bruce L.; L. Dalziell, Emma; Trudgen, Melinda S.; Bateman, Amber M.; Erickson, Todd E.
通讯作者	Lewandrowski, W (corresponding author), Kings Pk & Bot Gardens, Kings Pk Sci, 2 Kattidj Close, Kings Pk, WA 6005, Australia.
来源期刊	ECOLOGY AND EVOLUTION
ISSN	2045-7758
出版年	2021
卷号	11 期号:12 页码:8071-8084
英文摘要	Recruitment for many arid-zone plant species is expected to be impacted by the projected increase in soil temperature and prolonged droughts associated with global climate change. As seed dormancy is considered a strategy to avoid unfavorable conditions, understanding the mechanisms underpinning vulnerability to these factors is critical for plant recruitment in intact communities, as well as for restoration efforts in arid ecosystems. This study determined the effects of temperature and water stress on recruitment processes in six grass species in the genus Triodia R.Br. from the Australian arid zone. Experiments in controlled environments were conducted on dormant and less-dormant seeds at constant temperatures of 25 degrees C, 30 degrees C, 35 degrees C, and 40 degrees C, under well-watered (psi(soil) = -0.15 MPa) and water-limited (psi(soil) = -0.35 MPa) conditions. Success at three key recruitment stages-seed germination, emergence, and survival-and final seed viability of ungerminated seeds was assessed. For all species, less-dormant seeds germinated to higher proportions under all conditions; however, subsequent seedling emergence and survival were higher in the more dormant seed treatment. An increase in temperature (35-40 degrees C) under water-limited conditions caused 95%-100% recruitment failure, regardless of the dormancy state. Ungerminated seeds maintained viability in dry soil; however, when exposed to warm (30-40 degrees C) and well-watered conditions, loss of viability was greater from the less-dormant seeds across all species. This work demonstrates that the transition from seed to established seedling is highly vulnerable to microclimatic constraints and represents a critical filter for plant recruitment in the arid zone. As we demonstrate temperature and water stress-driven mortality between seeds and established seedlings, understanding how these factors influence recruitment in other arid-zone species should be a high priority consideration for management actions to mitigate the impacts of global change on ecosystem resilience. The knowledge gained from these outcomes must be actively incorporated into restoration initiatives.
英文关键词	arid zone bet hedging climate change drought germination grasslands resilience restoration seed dormancy seed viability soil moisture temperature thresholds Triodia water availability
类型	Article
语种	英语
开放获取类型	DOAJ Gold, Green Published
收录类别	SCI-E
WOS记录号	WOS:000648978600001
WOS关键词	CLIMATE-CHANGE ; HYDROTHERMAL-TIME ; RESTORATION ; GERMINATION ; REGENERATION ; RECRUITMENT ; DORMANCY ; SCIENCE ; SOIL ; STRATEGIES
WOS类目	Ecology ; Evolutionary Biology
WOS研究方向	Environmental Sciences & Ecology ; Evolutionary Biology
来源机构	Commonwealth Scientific and Industrial Research Organisation ; University of Western Australia
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/350042
作者单位	[Lewandrowski, Wolfgang; Stevens, Jason C.; L. Dalziell, Emma; Bateman, Amber M.; Erickson, Todd E.] Dept Biodivers Conservat & Attract, Kings Pk Sci, Kings Pk, WA, Australia; [Lewandrowski, Wolfgang; Stevens, Jason C.; Webber, Bruce L.; L. Dalziell, Emma; Trudgen, Melinda S.; Bateman, Amber M.; Erickson, Todd E.] Univ Western Australia, Sch Biol Sci, Crawley, WA, Australia; [Webber, Bruce L.; Trudgen, Melinda S.] CSIRO Hlth & Biosecur, Floreat, WA, Australia; [Webber, Bruce L.] Western Australian Biodivers Sci Inst, Perth, WA, Australia
推荐引用方式 GB/T 7714	Lewandrowski, Wolfgang,Stevens, Jason C.,Webber, Bruce L.,et al. Global change impacts on arid zone ecosystems: Seedling establishment processes are threatened by temperature and water stress[J]. Commonwealth Scientific and Industrial Research Organisation, University of Western Australia,2021,11(12):8071-8084.
APA	Lewandrowski, Wolfgang.,Stevens, Jason C..,Webber, Bruce L..,L. Dalziell, Emma.,Trudgen, Melinda S..,...&Erickson, Todd E..(2021).Global change impacts on arid zone ecosystems: Seedling establishment processes are threatened by temperature and water stress.ECOLOGY AND EVOLUTION,11(12),8071-8084.
MLA	Lewandrowski, Wolfgang,et al."Global change impacts on arid zone ecosystems: Seedling establishment processes are threatened by temperature and water stress".ECOLOGY AND EVOLUTION 11.12(2021):8071-8084.