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Life-Cycle Energy, Economic, and Greenhouse Gas Emissions of Diversified Sweet-Potato-Based Cropping Systems in South China

文献类型： 外文期刊

作者： Tang, Chaochen 1 ; Jiang, Bingzhi 1 ; Ameen, Asif 2 ; Mo, Xueying 1 ; Yang, Yang 3 ; Wang, Zhangying 1 ;

作者机构： 1.Guangdong Acad Agr Sci, Crops Res Inst, Key Lab Crop Genet Improvement Guangdong Prov, Guangzhou 510640, Peoples R China

2.Pakistan Agr Res Council, Rice Program, Lahore 39020, Pakistan

3.Minist Ecol & Environm, Solid Wastes & Chem Management Ctr, Beijing 100029, Peoples R China

关键词： life-cycle assessment; cropping system; energy balance; economic benefits; greenhouse-gas emissions

期刊名称：AGRONOMY-BASEL （ 影响因子：3.949； 五年影响因子：4.117 ）

ISSN：

年卷期： 2022 年 12 卷 10 期

页码：

收录情况： SCI

摘要： Sweet potato (Ipomoea batatas L.) is a promising food and industrial crop that plays an important role in China's agricultural poverty relief strategy. Selecting an appropriate cropping system for sweet-potato production could simultaneously achieve energy, economic, and environmental benefits. Therefore, the comprehensive assessment of diversified sweet-potato-based cropping systems (i.e., sweet potato monoculture (SP), continuous sweet potato cropping (SPSP), sweet potato- rice (SPRI), sweet potato-maize (SPMA), and sweet potato-potato (SPPO)) in South China was conducted with a field survey and life-cycle assessment. The data were collected quantitatively using a questionnaire for face-to-face interviewing of 70 farmers. The results indicated that the annual crop yield (sweet potato equivalent yield) of five cropping systems was in increasing order as SPPO > SPSP > SPMA > SPRI > SR The SPMA system exhibited the highest net energy (499.09 GJ/ha) and energy rate (7.77). The SPSP system performed better in energy efficiency (0.90 kg/MJ), net return (140,284 CNY/ha), benefit to cost rate (3.20), and eco-efficiency (45 CNY/kg CO2-eq). The annual greenhouse-gas (GHG) emissions of five cropping systems ranked from lowest to highest as follows: SP < SPRI < SPSP < SPMA < SPPO. With comprehensive consideration, extended rotation systems (e.g., SPMA, SPRI, and SPSP) are proposed because they could effectively reduce GHG emissions while maintaining or even increasing the system's productivity (ensuring food safety) in South China.

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