Uncertainties in the national inventory of methane emissions from rice cultivation: field measurements and modeling approaches

doi:10.1111/tpj.13580

	Uncertainties in the national inventory of methane emissions from rice cultivation: field measurements and modeling approaches
	Zhang, Wen ; Sun, Wenjuan 1; Li, Tingting
	2017
发表期刊	BIOGEOSCIENCES
ISSN	1726-4170
卷号	14 期号:1 页码:163-176
摘要	Uncertainties in national inventories originate from a variety of sources, including methodological failures, errors, and insufficiency of supporting data. In this study, we analyzed these sources and their contribution to uncertainty in the national inventory of rice paddy methane emissions in China and compared the differences in the approaches used (e.g., direct measurements, simple regressions, and more complicated models). For the 495 field measurements we collected from the scientific literature, the area-weighted 95% CI (confidence interval) ranged from 13.7 to 1115.4 kg CH4 ha(-1), and the histogram distribution of the measurements agreed well with parameterized gamma distributions. For the models, we compared the performance of methods of different complexity (i.e., the CH4MOD model, representing a complicated method, and two less complex statistical regression models taken from literature) to evaluate the uncertainties associated with model performance as well as the quality and accessibility of the regional datasets. Comparisons revealed that the CH4MOD model may perform worse than the comparatively simple regression models when no sufficient input data for the model is available. As simulated by CH4MOD with data of irrigation, organic matter incorporation, and soil properties of rice paddies, the modeling methane fluxes varied from 17.2 to 708.3 kgCH(4) ha(-1), covering 63% of the range of the field measurements. When applying the modeling approach to the 10 km x 10 km gridded dataset of the model input variables, the within-grid variations, made via the Monte Carlo method, were found to be 81.2-95.5% of the grid means. Upscaling the grid estimates to the national inventory, the total methane emission from the rice paddies was 6.43 (3.79-9.77) Tg. The fallacy of CH4MOD contributed 56.6% of the total uncertainty, with the remaining 43.4% being attributed to errors and the scarcity of the spatial datasets of the model inputs. Our analysis reveals the dilemma between model performance and data availability when using a modeling approach: a model with better performance may help in reducing uncertainty caused by model fallacy but increases the uncertainty caused by data scarcity since greater levels of input are needed to improve performance. Reducing the total uncertainty in the national methane inventory depends on a better understanding of both the complexity of the mechanisms of methane emission and the spatial correlations of the factors that influence methane emissions from rice paddies.
学科领域	Plant Sciences
DOI	10.1111/tpj.13580
收录类别	SCI
语种	英语
WOS关键词	GREENHOUSE-GAS EMISSIONS ; SOIL CHARACTERISTICS ; CARBON-DIOXIDE ; PADDY SOILS ; CHINA ; FLUXES ; TEMPERATURE ; MANAGEMENT ; REDUCTION ; TRANSPORT
WOS记录号	WOS:000405572800016
出版者	COPERNICUS GESELLSCHAFT MBH
文献子类	Article
出版地	GOTTINGEN
EISSN	1726-4189
资助机构	National Natural Science Foundation of ChinaNational Natural Science Foundation of China (NSFC) [41573069, 31370492, 41321064]
作者邮箱	sunwj@ibcas.ac.cn
作品OA属性	Bronze
引用统计	被引频次：20[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.ibcas.ac.cn/handle/2S10CLM1/22044
专题	植被与环境变化国家重点实验室
作者单位	1.Chinese Acad Sci, Inst Atmospher Phys, LAPC, Beijing, Peoples R China 2.Chinese Acad Sci, Inst Bot, LVEC, Beijing, Peoples R China
推荐引用方式 GB/T 7714	Zhang, Wen,Sun, Wenjuan,Li, Tingting. Uncertainties in the national inventory of methane emissions from rice cultivation: field measurements and modeling approaches[J]. BIOGEOSCIENCES,2017,14(1):163-176.
APA	Zhang, Wen,Sun, Wenjuan,&Li, Tingting.(2017).Uncertainties in the national inventory of methane emissions from rice cultivation: field measurements and modeling approaches.BIOGEOSCIENCES,14(1),163-176.
MLA	Zhang, Wen,et al."Uncertainties in the national inventory of methane emissions from rice cultivation: field measurements and modeling approaches".BIOGEOSCIENCES 14.1(2017):163-176.

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