Abstract
Aims
Corymbia spp. (previously included in the genus Eucalyptus) are common species in sub/tropical Australia and produce high quality timber and round logs. Thinning of native forests helps to preserve native tree species and is more sustainable than replacing native forest stands with mono-species plantations to produce timber. This study aimed to explore the effects of native forest thinning on soil-plant carbon (C) and nitrogen (N) dynamics in two experimental sites, Esk (5 years post-thinning) and Herberton (7 years post-thinning), situated in Queensland, Australia.
Methods
The two sites had different thinning regimes. The final stocking rates varied between 75 and 200 stems ha−1 at Esk and between 250 and 400 stems ha−1 at Herberton. The thinned plots were compared to un-thinned plots. Soil samples were collected to measure labile C and N. Leaf samples were collected from C. variegata and C. citriodora in Esk and Herberton respectively.
Results
Thinning did not change soil total C, total N, δ15N and inorganic N at either Esk or Herberton. However, at Esk, intensive thinning resulted in decreases in water soluble total N (WSTN). Foliar δ13C did not vary with respect to thinning whereas foliar δ15N values were more enriched in thinned areas than those of un-thinned plots. The stepwise linear regression indicated that both foliar total N and δ15N were explained mainly by soil TN and WSTN.
Conclusions
Thinning did not change soil C and N most likely due to the retention of thinned materials on site and their incorporation into soil. Foliar δ13C was not thinning-dependent due to homeostatic maintenance of the ratio of intercellular to ambient CO2 concentrations during photosynthesis. In our study, soil N was not a limiting factor for foliar N, however, foliar N was mainly driven by WSTN which may foreshadow a possible N limitation in severely thinned plots in the long term. We conclude that forest thinning does not decrease soil C and N availability in native Corymbia forests for several years post-thinning if the thinned materials are retained on site.
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Acknowledgment
This study was funded by James Cook University and Griffith University Collaborative Scheme. The authors would like to acknowledge the owner of the Herberton site (Mr. Olivier Lambert) and the owner of the Esk site for providing the access to the experimental sites. The authors would like to acknowledge Private Forestry Service Queensland (PFSQ) for providing the long term growth data and access to the Esk site. We thank Mr. Geoffrey Lambert for his assistance in both laboratory and sample collection, Mr. Yan Zhao for his assistance in sample collection and Mr. Rene Diocares for stable isotope analyses. SHB was supported by Collaborative Research Network – University of the Sunshine Coast Research Futures project.
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Bai, S.H., Dempsey, R., Reverchon, F. et al. Effects of forest thinning on soil-plant carbon and nitrogen dynamics. Plant Soil 411, 437–449 (2017). https://doi.org/10.1007/s11104-016-3052-5
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DOI: https://doi.org/10.1007/s11104-016-3052-5