干旱区生态环境知识资源中心(Arid): Does above-average rainfall stimulate a recruitment pulse in semi-arid woodlands of southeastern Australia?

Arid

DOI	10.1111/jvs.13148
	Does above-average rainfall stimulate a recruitment pulse in semi-arid woodlands of southeastern Australia?
	Kenny, Sally A.; Moxham, Claire
通讯作者	Kenny, SA
来源期刊	JOURNAL OF VEGETATION SCIENCE
ISSN	1100-9233
EISSN	1654-1103
出版年	2022
卷号	33 期号:5
英文摘要	Questions Regeneration success of semi-arid and arid regions worldwide is episodic and often linked to large rainfall events in consecutive years. It is also influenced by past and current land use, seed availability and herbivore grazing. This is particularly true for four dominant canopy trees - Allocasuarina luehmannii (Buloke), Casuarina pauper (Belah), Callitris gracilis (Slender Cypress Pine) and Myoporum platycarpum (Sugarwood) - within southeastern Australia semi-arid woodlands. These species also apply hedge-betting when responding to resource pulses with mass germination while low-level background recruitment continues. We asked if drought-breaking rainfall stimulated a germination pulse of these species and if it did, how did other external factors (grazing pressure from rabbits/hares, seed source, suitable seedbed) influence seedling abundance. We also asked if evidence of continuous recruitment had occurred during 14 years of drought by exploring trends in juvenile abundance. Location Victorian Mallee semi-arid woodlands, southeastern Australia. Methods We recorded seedling and juvenile abundance of the four dominant canopy species at 310 1-ha sites within semi-arid woodlands. Seedling presence was explored in relation to rainfall, tree density, ground cover and herbivory. Juvenile presence was explored in relation to rainfall, seedling and tree density, total plant cover and herbivory. Results Seedling and juvenile abundance were positively correlated with more mature trees, higher rainfall and no herbivory. Juvenile abundance was also positively correlated with more seedlings. There were more seedlings and juveniles at sites where rabbits/hares were present. Conclusions Above-average rainfall was positively correlated with initiation of recruitment; however, there was limited net recruitment of the four dominant canopy species indicating other factors are influencing germination (e.g. seed viability) or that seedlings are not surviving. The long-term survival of these semi-arid woodlands is in jeopardy without a concerted effort to maintain and improve their condition through revegetation works, weed removal and herbivore management.
英文关键词	Allocasuarina luehmannii Callitris gracilis canopy trees Casuarina pauper grazing pressure Myoporum platycarpum rainfall recruitment semi-arid
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000855190200001
WOS关键词	ARID-ZONE ; RECOVERY PROCESSES ; SOIL SEEDBANK ; GRAZING LANDS ; SHRUBS ; REGENERATION ; RABBITS ; RANGELAND ; DYNAMICS ; SHEEP
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/2XILL650/393630
推荐引用方式 GB/T 7714	Kenny, Sally A.,Moxham, Claire. Does above-average rainfall stimulate a recruitment pulse in semi-arid woodlands of southeastern Australia?[J],2022,33(5).
APA	Kenny, Sally A.,&Moxham, Claire.(2022).Does above-average rainfall stimulate a recruitment pulse in semi-arid woodlands of southeastern Australia?.JOURNAL OF VEGETATION SCIENCE,33(5).
MLA	Kenny, Sally A.,et al."Does above-average rainfall stimulate a recruitment pulse in semi-arid woodlands of southeastern Australia?".JOURNAL OF VEGETATION SCIENCE 33.5(2022).