Evaluation of energy balances and greenhouse gas emissions from different agricultural production systems in Minqin Oasis, China

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dc.contributor.authorYan, Zhengang
dc.contributor.authorLi, Wei
dc.contributor.authorYan, Tianhai
dc.contributor.authorChang, Shenghua
dc.contributor.authorHou, Fujiang
dc.date.accessioned2020-07-15T13:58:13Z
dc.date.available2020-07-15T13:58:13Z
dc.date.issued2019-06-26
dc.descriptionPublication history: Accepted - 4 February 2019; Published online - 26 June 2019en_US
dc.description.abstractAgricultural production in Minqin Oasis, China, is commonly categorized as intensive crop production (ICP), integrated crop–livestock production (ICLP), intensive livestock production (confined feeding) (IFLP), and extensive livestock production (grazing) (EGLP). The objectives of the present study were to use a life cycle assessment technique to evaluate on-farm energy balances and greenhouse gas (GHG) emissions of agricultural production, and to compare the differences among the four systems. Data used in the present study were collected from published literature and face-to face questionnaires from 529 farms in eight towns (two towns per production system) within Minqin county. The ANOVA of averaged data from 2014 to 2015 indicated that the net energy ratio (Output/Input) for the EGLP system was significantly higher than that for any other system (P < 0.01), whereas the difference among other three systems were not significant. The EGLP system generated lower CO2-eq emissions per hectare of farmland than other systems (P < 0.01). Relating carbon economic efficiency to market values (US$) of agricultural products, indicated that the carbon economic efficiency (US$/kg CO2-eq) of the IFLP system was significantly greater than that of other systems (P < 0.01). The major GHG emission sources varied across the systems, that is, soil respiration is the dominant source in EGLP, while the main sources in IFLP are enteric methane and manure management; in ICLP major sources are enteric methane, soil respiration and fertilizer; and in ICP are soil respiration and fertilizer. The structural equation modelling analysis showed that livestock category was strongly linked to net income. The direct effects and total effects of water use efficiency, via its positive influence on energy balances and GHG emissions were much stronger than those of other dependent variables. The study provides important benchmark information to help develop sustainable agricultural production systems on energy balances and GHG emissions in northwestern China.en_US
dc.description.sponsorshipThis study was financially supported by the Strategic Priority Research Program of Chinese Academy of Sciences, Grant No. XDA20100102, National Natural Science Foundation of China (No. 31660347 and 31672472), Program for Changjiang Scholars and Innovative Research Team in University (IRT_17R50).en_US
dc.identifierhttp://hdl.handle.net/20.500.12518/155
dc.identifier.citationYan, Z., Li, W., Yan, T., Chang, S. and Hou, F. (2019) ‘Evaluation of energy balances and greenhouse gas emissions from different agricultural production systems in Minqin Oasis, China’, PeerJ. PeerJ. doi:10.7717/peerj.6890en_US
dc.identifier.issn2167-8359
dc.identifier.urihttps://doi.org/10.7717/peerj.6890
dc.language.isoenen_US
dc.publisherPeer Jen_US
dc.rights© 2019 Yan et al. Licence This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, reproduction and adaptation in any medium and for any purpose provided that it is properly attributed. For attribution, the original author(s), title, publication source (PeerJ) and either DOI or URL of the article must be cited.en_US
dc.subjectMinqin Oasis, Energy balances, Greenhouse gas emissions, Life cycle assessmenten_US
dc.titleEvaluation of energy balances and greenhouse gas emissions from different agricultural production systems in Minqin Oasis, Chinaen_US
dc.typeArticleen_US
dcterms.dateAccepted2019-06-26
dcterms.dateSubmitted2018-08-30

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