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Ecophysiological and foliar nitrogen concentration responses of understorey Acacia spp. and Eucalyptus sp. to prescribed burning

Ma, Ling, Rao, Xingquan, Lu, Ping, Bai, Shahla Hosseini, Xu, Zhihong, Chen, Xiaoyang, Blumfield, Timothy and Xie, Jun (2015). Ecophysiological and foliar nitrogen concentration responses of understorey Acacia spp. and Eucalyptus sp. to prescribed burning. Environmental Science and Pollution Research,22(13):10254-10262.

Document type: Journal Article
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IRMA ID 84376995xPUB272
Title Ecophysiological and foliar nitrogen concentration responses of understorey Acacia spp. and Eucalyptus sp. to prescribed burning
Author Ma, Ling
Rao, Xingquan
Lu, Ping
Bai, Shahla Hosseini
Xu, Zhihong
Chen, Xiaoyang
Blumfield, Timothy
Xie, Jun
Journal Name Environmental Science and Pollution Research
Publication Date 2015
Volume Number 22
Issue Number 13
ISSN 0944-1344   (check CDU catalogue open catalogue search in new window)
Scopus ID 2-s2.0-84933183199
Start Page 10254
End Page 10262
Total Pages 9
Place of Publication Germany
Publisher Springer
Field of Research ENVIRONMENTAL SCIENCES
HERDC Category C1 - Journal Article (DIISR)
Abstract Eucalyptus spp. is a dominant tree genus in Australia and most Eucalyptus spp. are canopy dominant species. In Australian natural forests, Eucalyptus spp. commonly are associated with understorey legumes which play a crucial role for ecological restoration owing to their nitrogen (N) fixing ability for replenishing the soil N lost after frequent prescribed burning. This study aimed to explore to what extent physiological responses of these species differ 7 and 12 years after last fire. Two most common understorey Acacia spp., Acacia leiocalyx and A. disparrima, as well as one non-leguminous Eucalyptus resinifera, were studied due to their dominance in the forest. Both A. leiocalyx and A. disparrima showed higher carbon (C) assimilation capacity, maximum photosynthetic capacity, and moderate foliar C/N ratio compared with E. resinifera. A. leiocalyx showed various advantages compared to A. disparrima such as higher photosynthetic capacity, adaptation to wider light range and higher foliar total N (TNmass). A. leiocalyx also relied on N2-fixing ability for longer time compared to A. disparrima. The results suggested that the two Acacia spp. were more beneficial to C and N cycles for the post burning ecosystem than the non-N2-fixing species E. resinifera. A. leiocalyx had greater contribution to complementing soil N cycle long after burning compared to A. disparrima.
Keywords Leaf gas exchange
Carbon and nitrogen isotope composition (δ13C and δ15N)
Acacia leiocalyx
A. disparrima
Eucalyptus resinifera
Symbiotic N2 fixation
DOI http://dx.doi.org/10.1007/s11356-015-4223-2   (check subscription with CDU E-Gateway service for CDU Staff and Students  check subscription with CDU E-Gateway in new window)
 
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