气候变化领域集成服务门户(CCPortal): The influence of seed supply and seedbed on seedling recruitment in shelterwood-treated jarrah (Eucalyptus marginata) forest

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DOI	10.1016/j.foreco.2018.09.008
	The influence of seed supply and seedbed on seedling recruitment in shelterwood-treated jarrah (Eucalyptus marginata) forest
	Cargill J.; van Etten E.J.B.; Stock W.D.
发表日期	2019
ISSN	0378-1127
起始页码	54
结束页码	63
卷号	432
英文摘要	Successful and adequate recruitment of seedlings is an essential ecological process in forest ecosystem dynamics and is a key principle underpinning sustainable timber harvesting. This is particularly so with the shelterwood silvicultural system used in the jarrah (Eucalyptus marginata) forest of south-west Australia where partial cuts of overstorey are made followed by prescribed burning to stimulate seed fall and seedling establishment. There have been concerns over the lack of seedling recruitment in some shelterwood-treated areas of the jarrah forest, and hence this study was implemented to explore the roles of seed supply and seedbed conditions in limiting recruitment of jarrah seedlings. Low seedling densities were recorded across all six burnt study sites and were strongly correlated (at both broad and fine scales) with both canopy seed store and seed fall. Ample levels of post-burn seed fall only resulted in low seedling numbers suggesting that adequate seed supply did not coincide with seedbed conditions suitable for mass seedling regeneration. Conditions favourable for seedling recruitment were highly variable within sites, since both seed supply and seedbed conditions were spatially heterogeneous. Fine-scale areas burnt to mineral soil showed an additive influence to the overwhelmingly dominant factor of seed supply on seedling recruitment. However, the capacity of low intensity burns to produce these seedbed conditions at a broad scale appears to be limited. Results suggest that successful stocking of shelterwood-treated jarrah forest is not always feasible following a single silvicultural event, such as post-harvest burning under mild conditions. The chances of ample seed supply coinciding with broad-scale seedbed conditions favourable for mass germination, emergence and establishment appear to be low. Successful stocking of shelterwood-treated jarrah forest is more likely to be a longer term outcome achieved through episodic recruitment, especially when favourable environmental conditions coincide with optimal seedbed conditions. Such episodic recruitment strategies may be common in resource-limited systems such as jarrah forest and other dry eucalypt forest systems, where conditions controlling the regeneration niche are often variable and unpredictable. © 2018
英文关键词	Eucalyptus marginata; Forest regeneration; Jarrah forest; Seedbed; Seedling recruitment; Shelterwood; Sustainable forest management
语种	英语
scopus关键词	Ecosystems; Logging (forestry); Seed; Eucalyptus marginata; Forest regeneration; Jarrah forests; Seedbed; Seedling recruitment; Shelterwood; Sustainable forest management; Reforestation; dry forest; ecosystem dynamics; environmental conditions; evergreen forest; forest ecosystem; niche; overstory; prescribed burning; recruitment (population dynamics); regeneration; seed; seed bank; seedling; silviculture; sustainable development; timber harvesting; wood; Ecosystems; Eucalyptus Marginata; Reforestation; Shelterwood; Sustainable Forest Management; Australia; Eucalyptus marginata
来源期刊	Forest Ecology and Management
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/156410
作者单位	Centre for Ecosystem Management, School of Science, Edith Cowan University, 270 Joondalup Drive, Joondalup, WA 6027, Australia
推荐引用方式 GB/T 7714	Cargill J.,van Etten E.J.B.,Stock W.D.. The influence of seed supply and seedbed on seedling recruitment in shelterwood-treated jarrah (Eucalyptus marginata) forest[J],2019,432.
APA	Cargill J.,van Etten E.J.B.,&Stock W.D..(2019).The influence of seed supply and seedbed on seedling recruitment in shelterwood-treated jarrah (Eucalyptus marginata) forest.Forest Ecology and Management,432.
MLA	Cargill J.,et al."The influence of seed supply and seedbed on seedling recruitment in shelterwood-treated jarrah (Eucalyptus marginata) forest".Forest Ecology and Management 432(2019).