气候变化领域集成服务门户(CCPortal): A decadal multi-site study of the effects of frequency and season of harvest on biomass production from mallee eucalypts

CCPortal

DOI	10.1016/j.foreco.2019.117576
	A decadal multi-site study of the effects of frequency and season of harvest on biomass production from mallee eucalypts
	Spencer B.; Bartle J.; Huxtable D.; Mazanec R.; Abadi A.; Gibberd M.; Zerihun A.
发表日期	2019
ISSN	0378-1127
卷号	453
英文摘要	Mallee eucalypts are hardy, woody perennials that are being developed as a short-rotation coppice crop in Australia for the production of eucalyptus oil, biofuels and other biomass products. The economic viability of this prospective crop is dependent on its ability to survive and regenerate following repeated harvesting of the above ground component. Here we report on survival and biomass yield of mallee belt plantings of Eucalyptus polybractea, E. loxophleba ssp lissophloia and E. kochii ssp plenissima, at 19 sites, under two harvest-frequencies (3–8 year cycles) and harvest seasons (autumn or spring) over a decade from 2006 to 2015. 16 sites had post-harvest mortality ranging from 1.0% to 12.2% while the remaining three sites with either shallow saline water tables or a silcrete hardpan failed. Average site dry biomass yield across treatments ranged from 2.2 to 32.8 Mg ha−1 yr−1. Higher yielding sites were generally characterised by pH between 3.8 and 8, ECe below 15.0 dS m−1 and high soil fertility. Lower yielding sites were generally near saline valley floors. After 7-years, biomass yield from unharvested treatments exceeded the average cumulative yield of harvest treatments at eight of the 16 sites, including all three E. kochii sites. For E. loxophleba, significant interactions were found between season and frequency of harvest with highest yields in long rotation spring treatments. There were also interactions between site and frequency of harvest, which were mainly driven by the variable performance of the uncut treatment. On average E. loxophleba yielded more biomass following spring harvests whereas E. kochii yielded more following autumn harvests. E. polybractea yield was unaffected by season or frequency of harvest; however, harvest treatments yielded more biomass than uncut treatments. After 10 years, at eight of the nine sites subjected to three 3-year cycles, no decline in biomass yield was observed. The site that declined in production was attributed to depletion of a sandplain aquifer by extensive mallee plantings. Overall, the results from this decadal study indicate that in warm-temperate semi-arid areas, such as the south-west of WA, mallees biomass can be harvested sustainably at most sites even in short (3-year) rotation cycles. © 2019 Elsevier B.V.
英文关键词	Belt-plantings; Bioenergy crops; Carbon sequestration; Mallee eucalypts; Multiple harvest cycles; Oil mallee; Short-rotation coppice; Tree mortality
语种	英语
scopus关键词	Aquifers; Biofuels; Crops; Harvesting; Reforestation; Rotation; Saline water; Bioenergy crops; Carbon sequestration; Harvest cycles; Mallee eucalypts; Oil mallee; Plantings; Short rotation coppice; Tree mortality; Biomass; aquifer; bioenergy; biomass; carbon sequestration; coppice; crop production; crop rotation; crop yield; economic conditions; energy crop; mortality; seasonal variation; soil fertility; tree; woody plant; Aquifers; Biomass; Farm Crops; Harvesting; Reforestation; Rotation; Australia; Eucalyptus; Eucalyptus kochii; Eucalyptus loxophleba; Eucalyptus polybractea
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/155729
作者单位	School of Molecular and Life Science, Curtin University, GPO Box U1987, Perth, WA 6845, Australia; Department of Biodiversity, Conservation and Attractions, Kensington, WA 6151, Australia; Equinox Environmental Pty Ltd, 6 Craigie Crescent, ManningWA 6152, Australia
推荐引用方式 GB/T 7714	Spencer B.,Bartle J.,Huxtable D.,et al. A decadal multi-site study of the effects of frequency and season of harvest on biomass production from mallee eucalypts[J],2019,453.
APA	Spencer B..,Bartle J..,Huxtable D..,Mazanec R..,Abadi A..,...&Zerihun A..(2019).A decadal multi-site study of the effects of frequency and season of harvest on biomass production from mallee eucalypts.Forest Ecology and Management,453.
MLA	Spencer B.,et al."A decadal multi-site study of the effects of frequency and season of harvest on biomass production from mallee eucalypts".Forest Ecology and Management 453(2019).