干旱区生态环境知识资源中心(Arid): Shrinking opportunities for establishment of native annual forbs in fragmented grassy woodlands

Arid

DOI	10.1111/avsc.12506
	Shrinking opportunities for establishment of native annual forbs in fragmented grassy woodlands
	Morgan, John W.; Ebsary, Jemma
通讯作者	Morgan, JW
来源期刊	APPLIED VEGETATION SCIENCE
ISSN	1402-2001
EISSN	1654-109X
出版年	2020
卷号	23 期号:4 页码:575-585
英文摘要	Questions Repeat vegetation surveys in fragmented woodlands in southeast Australia show native and exotic annual plant species have different trajectories of abundance; native annuals are declining while exotic annuals are increasing. We ask: is the divergent species origin response due to fundamental differences in germination cues and/or "safe -sites" for establishment? Location Temperate grassy woodlands, southern Victoria, Australia. Methods We quantified patch type frequency in the field. Diurnal temperature effects on four native annual forbs and three exotic annual grasses were assessed in a laboratory germination trial. We used a glasshouse experiment to assess the effects of patch type (bare ground, tree litter, grass litter, moss mat) on the emergence and growth of two native and two exotic annuals. Results Exotic annuals typically had higher and more rapid germination across a wider range of diurnal temperatures than native annuals. Emergence of native and exotic annuals was highest on bare ground patches but was suppressed by leaf litter and moss mat. Native annuals did not emerge from under a moss mat and germinated much less than exotics in all patch types. Seedling growth of native annuals was suppressed by tree litter whereas growth of exotic species was not suppressed by litter or the moss mat. Conclusions The regeneration niche of the native annual forb species we examined was typically narrower than that of exotic annual grasses. Many of the differences in response between native and exotic species may be due to seed traits such as seed mass; native annuals have much smaller seeds than exotic annual species. This likely affects the persistence, germination cues, co-existence and restoration potential of native annuals in fragmented grassy woodlands that have lost their endogenous disturbance agents.
英文关键词	fragmentation germination invasive grasses niche contraction patch type regeneration niche safe site
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000551595900001
WOS关键词	ENVIRONMENTAL GRADIENTS ; SEEDLING RECRUITMENT ; WESTERN VICTORIA ; VASCULAR PLANTS ; INVASIVE PLANTS ; ARID REGION ; GERMINATION ; COMMUNITY ; SOIL ; DISTURBANCE
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/2XILL650/325165
作者单位	[Morgan, John W.; Ebsary, Jemma] La Trobe Univ, Dept Ecol Environm & Evolut, Bundoora, Vic 3086, Australia; [Morgan, John W.] La Trobe Univ, Res Ctr Future Landscapes, Bundoora, Vic, Australia
推荐引用方式 GB/T 7714	Morgan, John W.,Ebsary, Jemma. Shrinking opportunities for establishment of native annual forbs in fragmented grassy woodlands[J],2020,23(4):575-585.
APA	Morgan, John W.,&Ebsary, Jemma.(2020).Shrinking opportunities for establishment of native annual forbs in fragmented grassy woodlands.APPLIED VEGETATION SCIENCE,23(4),575-585.
MLA	Morgan, John W.,et al."Shrinking opportunities for establishment of native annual forbs in fragmented grassy woodlands".APPLIED VEGETATION SCIENCE 23.4(2020):575-585.