气候变化领域集成服务门户(CCPortal): Attempt to correct grassland N2O fluxes biased by the DN-based opaque static chamber measurement

CCPortal

DOI	10.1016/j.atmosenv.2021.118687
	Attempt to correct grassland N2O fluxes biased by the DN-based opaque static chamber measurement
	Ma L.; Zhang W.; Zheng X.; Yao Z.; Zhang H.; Wang R.; Zhu B.; Wang K.; Liu C.; Cao G.; Wang Y.; Zhang Y.; Zhou W.; Han S.; Zhang J.; Wang Y.
发表日期	2021
ISSN	1352-2310
卷号	264
英文摘要	The DN method, referred to a gas chromatography (GC) method uses dinitrogen as a carrier gas, in combination with opaque static chamber, was widely used to measure grassland nitrous oxide (N2O) fluxes. However the N2O fluxes were positively biased by this method, as compared to the other GC methods. Currently, no study was conducted through simultaneous measurements of N2O fluxes by DN and other GC methods to correct the biased fluxes by the DN-based opaque static chamber measurement in grasslands. For this purpose, DN and DN-CO2 methods (dinitrogen is also used as a carrier gas, and carbon dioxide as a make-up gas), both in combination with opaque static chambers, were compared through paired measurements in alpine pastures, including meadow as grazed pasture (MGP), ungrazed meadow (UGM), zokor mounds in meadow (ZMM), dung patches in meadow (DPM) and peat wetland as pasture (PWP). The DN method resulted in N2O fluxes about 11.1, 12.1 and 7.5 times higher (p < 0.05) in MGP, UGM and ZMM, respectively, while there was no significant difference between the two methods in DPM or PWP. All the paired fluxes with DN-CO2 measurements >15 μg N m−2 h−1 showed positive correlations between the N2O fluxes measured by the two methods (p < 0.0001), whereas the other measurements showed a negative linear correlation of flux differences between the two methods versus DN-measured fluxes (p < 0.0001). We further developed correction approaches for DN-measured fluxes and validated these corrections using the data from this study or those observed previously in different terrestrial ecosystems by other studies. The estimated annual N2O emissions from grasslands in China would be reduced from 288.1 to 98.7–142.3 Gg N yr−1 (1 Gg = 109 g) if DN-measured fluxes were corrected using the approaches established in this study. We concluded that the DN method should be replaced by other GC methods or non-GC techniques to measure N2O fluxes from terrestrial ecosystems. Moreover, our study provides a valid approach to correct DN-measured N2O fluxes from global grasslands. © 2021 Elsevier Ltd
关键词	Carrier gas Dinitrogen Gas chromatography Grassland Make-up gas Nitrous oxide
语种	英语
scopus关键词	Agriculture; Carbon dioxide; Ecosystems; Gas chromatography; Nitrogen oxides; Wetlands; Alpine pastures; Carrier gas; Dinitrogen; Grassland; Make-up gas; Measurements of; Nitrous oxide; Simultaneous measurement; Static chambers; Terrestrial ecosystems; Gases; carbon dioxide; nitrous oxide; carbon dioxide; concentration (composition); detection method; experimental study; grassland; measurement method; nitrous oxide; wetland; analytic method; Article; controlled study; cropland; degradation; Deschampsia littoralis; ecosystem; Elymus; Elymus nutans; gas chromatography; grassland; grazing; greenhouse gas; intermethod comparison; livestock; measurement; monsoon climate; Myospalax fontanierii; overgrazing; pasture; plant community; Poa crymophila; Potentilla; Potentilla bifurca; Tibet; wetland; China
来源期刊	ATMOSPHERIC ENVIRONMENT
来源机构	中国科学院西北生态环境资源研究院
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/248234
作者单位	State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing, 100029, China; College of Earth and Planetary Sciences, University of Chinese Academy of Sciences, Beijing, 100049, China; Key Laboratory of Mountain Environment Evolvement and Regulation, Institute of Mountain Hazards and Environment, Chinese Academy of Sciences, Chengdu, 610041, China; Northwest Institute of Plateau Biology, Chinese Academy of Sciences, Xining, 810008, China; College of Resources and Environment, University of Chinese Academy of Sciences, Beijing, 100049, China; Key Laboratory of Tropical Forest Ecology, Xishuangbanna Tropical Botanical Garden, Chinese Academy of Sciences, Mengla, 666303, China; Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang, 110016, China
推荐引用方式 GB/T 7714	Ma L.,Zhang W.,Zheng X.,et al. Attempt to correct grassland N2O fluxes biased by the DN-based opaque static chamber measurement[J]. 中国科学院西北生态环境资源研究院,2021,264.
APA	Ma L..,Zhang W..,Zheng X..,Yao Z..,Zhang H..,...&Wang Y..(2021).Attempt to correct grassland N2O fluxes biased by the DN-based opaque static chamber measurement.ATMOSPHERIC ENVIRONMENT,264.
MLA	Ma L.,et al."Attempt to correct grassland N2O fluxes biased by the DN-based opaque static chamber measurement".ATMOSPHERIC ENVIRONMENT 264(2021).