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	Comparison of manual and automated chambers for field measurements of N2O, CH4, CO2 fluxes from cultivated land
	Yao, Zhisheng1; Zheng, Xunhua1; Xie, Baohua1; Liu, Chunyan1; Mei, Baoling1; Dong, Haibo1; Butterbach-Bahl, Klaus2; Zhu, Jianguo3
刊名	ATMOSPHERIC ENVIRONMENT
	2009-04-01
卷号	43期号:11页码:1888-1896
关键词	Automated and manual methods Carbon dioxide Nitrous oxide Methane Rice-wheat rotation
ISSN号	1352-2310
DOI	10.1016/j.atmosenv.2008.12.031
通讯作者	Zheng, Xunhua(xunhua.zheng@post.iap.ac.cn)
英文摘要	Chamber techniques can easily be applied to field trials with multiple small plots measuring carbon- and nitrogen-trace gas fluxes. Nevertheless, such chamber measurements are usually made weekly and rarely more frequently than once daily. However, automatic chambers do allow flux measurements on sub-daily time scales. It has been hypothesized that sub-daily measurements provide more reliable results, as diurnal variations are captured better compared to manual measurements. To test this hypothesis we compared automatic and manual measurements of N2O, CO2 and CH4 fluxes from tilled and non-tilled plots of a rice-wheat rotation ecosystem over a non-waterlogged period. Our results suggest that both techniques, i.e., either manual or automatic chambers of N2O and CO2 emissions resulted in biased fluxes. The manual measurements were adequate to capture either day-to-day or seasonal dynamics of N2O, CO2 and CH4 exchanges, but overestimated the cumulative N2O and CO2 emissions by 18% and 31%, respectively. This was due to neglecting temperature-dependent diurnal variations of C and N trace gas fluxes. However, the automatic measurements underestimated the cumulative emissions of N2O and CO2 by 22% and 17%, respectively. This underestimation resulted from chamber effects upon soil moisture during rainfall processes. No significant difference was detected between the two methods in CH4 exchanges over the non-waterlogged soils. The bias of manual chambers may be significant when pronounced diurnal variations occur. The bias of automatic measurements can only be avoided/minimized if chamber positions are frequently changed and/or if chambers are automatically opened during rainfall events. We therefore recommend using automatic chambers together with continuous measurements of soil chamber Moisture to allow for soil moisture correction of fluxes or to correct flux estimates as derived by manual chambers for possible diurnal variations. (C) 2009 Elsevier Ltd. All rights reserved.
收录类别	SCI
WOS关键词	NITROUS-OXIDE EMISSIONS ; CARBON-DIOXIDE ; SOIL RESPIRATION ; INNER-MONGOLIA ; FOREST SOILS ; ARABLE SOILS ; GAS FLUXES ; METHANE ; TEMPERATURE ; ATMOSPHERE
WOS研究方向	Environmental Sciences & Ecology ; Meteorology & Atmospheric Sciences
WOS类目	Environmental Sciences ; Meteorology & Atmospheric Sciences
语种	英语
出版者	PERGAMON-ELSEVIER SCIENCE LTD
WOS记录号	WOS:000264349300006
内容类型	期刊论文
URI标识	http://www.corc.org.cn/handle/1471x/2558770
专题	南京土壤研究所
通讯作者	Zheng, Xunhua
作者单位	1.Chinese Acad Sci, State Key Lab Atmospher Boundary Layer Phys & Atm, Inst Atmospher Phys, Beijing 100029, Peoples R China 2.Karlsruhe Res Ctr, Inst Meteorol & Climate Res, D-82467 Garmisch Partenkirchen, Germany 3.Chinese Acad Sci, State Key Lab Soil & Sustainable Agr, Nanjing Inst Soil Sci, Nanjing 21008, Peoples R China
推荐引用方式 GB/T 7714	Yao, Zhisheng,Zheng, Xunhua,Xie, Baohua,et al. Comparison of manual and automated chambers for field measurements of N2O, CH4, CO2 fluxes from cultivated land[J]. ATMOSPHERIC ENVIRONMENT,2009,43(11):1888-1896.
APA	Yao, Zhisheng.,Zheng, Xunhua.,Xie, Baohua.,Liu, Chunyan.,Mei, Baoling.,...&Zhu, Jianguo.(2009).Comparison of manual and automated chambers for field measurements of N2O, CH4, CO2 fluxes from cultivated land.ATMOSPHERIC ENVIRONMENT,43(11),1888-1896.
MLA	Yao, Zhisheng,et al."Comparison of manual and automated chambers for field measurements of N2O, CH4, CO2 fluxes from cultivated land".ATMOSPHERIC ENVIRONMENT 43.11(2009):1888-1896.

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