Impacts of prescribed burning on soil greenhouse gas fluxes in a suburban native forest of south-eastern Queensland, Australia

	Impacts of prescribed burning on soil greenhouse gas fluxes in a suburban native forest of south-eastern Queensland, Australia
	Zhao, Y.1; Wang, Y. Z.1; Xu, Z. H.1; Fu, L.1
刊名	BIOGEOSCIENCES
	2015
卷号	12 期号:21
通讯作者	Xu, ZH (reprint author), Griffith Univ, Environm Futures Res Inst, Brisbane, Qld 4111, Australia.
英文摘要	Prescribed burning is a forest management practice that is widely used in Australia to reduce the risk of damaging wildfires. Prescribed burning can affect both carbon (C) and nitrogen (N) cycling in the forest and thereby influence the soil-atmosphere exchange of major greenhouse gases, i.e. carbon dioxide (CO2), methane (CH4) and nitrous oxide (N2O). To quantify the impact of a prescribed burning (conducted on 27 May 2014) on greenhouse gas exchange and the potential controlling mechanisms, we carried out a series of field measurements before (August 2013) and after (August 2014 and November 2014) the fire. Gas exchange rates were determined in four replicate plots which were burned during the combustion and in another four adjacent unburned plots located in green islands, using a set of static chambers. Surface soil properties including temperature, pH, moisture, soil C and N pools were also determined either by in situ measurement or by analysing surface 10 cm soil samples. All of the chamber measurements indicated a net sink of atmospheric CH4, with mean CH4 uptake ranging from 1.15 to 1.99 mg m(-2) d(-1). Prescribed burning significantly enhanced CH4 uptake as indicated by the significant higher CH4 uptake rates in the burned plots measured in August 2014. In the following 3 months, the CH4 uptake rate was recovered to the pre-burning level. Mean CO2 emission from the forest soils ranged from 2721.76 to 7113.49 mg m(-2) d(-1). The effect of prescribed burning on CO2 emission was limited within the first 3 months, as no significant difference was observed between the burned and the adjacent unburned plots in both August and November 2014. The CO2 emissions showed more seasonal variations, rather than the effects of prescribed burning. The N2O emission in the plots was quite low, and no significant impact of prescribed burning was observed. The changes in understory plants and litter layers, surface soil temperature, C and N substrate availability and microbial activities, following the prescribed burning, were the factors that controlled the greenhouse gas exchanges. Our results suggested that the low-intensity prescribed burning would decrease soil CO2 emission and increase CH4 uptake, but this effect would be present within a relatively short period. Only slight changes in the surface soil properties during the combustion and very limited impacts of prescribed burning on the mineral soils supported the rapid recovery of the greenhouse gas exchange rates.
研究领域[WOS]	Ecology ; Geosciences, Multidisciplinary
收录类别	SCI
语种	英语
WOS记录号	WOS:000365091900002
内容类型	期刊论文
源URL	[http://ir.ceode.ac.cn/handle/183411/38502]
专题	遥感与数字地球研究所_SCI/EI期刊论文_期刊论文
作者单位	1.[Zhao, Y. 2.Wang, Y. Z. 3.Xu, Z. H. 4.Fu, L.] Griffith Univ, Environm Futures Res Inst, Brisbane, Qld 4111, Australia 5.[Zhao, Y. 6.Wang, Y. Z. 7.Xu, Z. H. 8.Fu, L.] Griffith Univ, Sch Nat Sci, Brisbane, Qld 4111, Australia 9.[Zhao, Y.] Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, Beijing 100101, Peoples R China 10.[Wang, Y. Z.] Nankai Univ, Coll Environm Sci & Engn, Key Lab Pollut Proc & Environm Criteria, Tianjin 300071, Peoples R China
推荐引用方式 GB/T 7714	Zhao, Y.,Wang, Y. Z.,Xu, Z. H.,et al. Impacts of prescribed burning on soil greenhouse gas fluxes in a suburban native forest of south-eastern Queensland, Australia[J]. BIOGEOSCIENCES,2015,12(21).
APA	Zhao, Y.,Wang, Y. Z.,Xu, Z. H.,&Fu, L..(2015).Impacts of prescribed burning on soil greenhouse gas fluxes in a suburban native forest of south-eastern Queensland, Australia.BIOGEOSCIENCES,12(21).
MLA	Zhao, Y.,et al."Impacts of prescribed burning on soil greenhouse gas fluxes in a suburban native forest of south-eastern Queensland, Australia".BIOGEOSCIENCES 12.21(2015).