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Increasing farm size to improve energy use efficiency and sustainability in maize production

文献类型： 外文期刊

作者： Zhang, Wushuai 1 ; Qian, Chunrong 3 ; Carlson, Kimberly M. 4 ; Ge, Xuanliang 5 ; Wang, Xingbang 1 ; Chen, Xinping 1 ;

作者机构： 1.Southwest Univ, Coll Resources & Environm, Chongqing 400700, Peoples R China

2.Southwest Univ, Acad Agr Sci, Chongqing 400700, Peoples R China

3.Heilongjiang Acad Agr Sci, Inst Crop Tillage & Cultivat, Harbin, Peoples R China

4.NYU, Dept Environm Studies, New York, NY USA

5.Inner Mongolia Univ Nationalities, Coll Agron, Tongliao, Peoples R China

关键词： energy use efficiency; farm size; greenhouse gas emission; life cycle assessment; sustainability index

期刊名称：FOOD AND ENERGY SECURITY （ 影响因子：4.109； 五年影响因子：8.33 ）

ISSN： 2048-3694

年卷期： 2021 年 10 卷 1 期

页码：

收录情况： SCI

摘要： While the relationship between crop yields and the environmental impacts of crop agriculture has been well-documented, research on the relationship between farm size and the sustainability of cereal production is limited. Using survey data on 120 farms with both small- and large-scale fields in Northeast China, this paper combines a life cycle assessment and the carbon-based sustainability index (SI) algorithm to examine how maize productivity and agricultural inputs vary with farm size and to clarify how increasing farm size is correlated with energy use efficiency (EUE) and the SI. The results indicate that maize grain yield did not vary with farm size. Increasing farm size was shown to lead to reductions in the areal (per ha) rates of agro-chemical inputs, energy depletion, and greenhouse gas emissions and increased in EUE and SI. Fertilizer- and fuel-related agricultural inputs dominated the variations of EUE and SI. A scenario analysis indicates that, if farmers adopt a comprehensive management strategy (i.e., machines appropriate to farm size and recommended fertilizer application rates and crop management strategies), EUE and SI would increase by 68.5% (from 4.45 to 7.50) and 74.3% (from 10.1 to 17.6), respectively. Although increasing farm size could benefit maize sustainable production when matched with technical innovation and machinery coordination, supporting smallholder farmers to increase their resource use efficiency and sustainability is also key in China and other regions where smallholder farms comprise a large portion of the cropland area.

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