Guangdong Province Key Laboratory for Land use and consolidation, South China Agricultural University, Guangzhou 510642, China.
State Key Laboratory of Resources and Environmental Information System, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China.
Sci Total Environ. 2018 Jul 1;628-629:103-109. doi: 10.1016/j.scitotenv.2018.02.016. Epub 2018 Feb 13.
Rape is a non-grain feedstock with several characteristics that make it suitable for biofuel production, such as high oil yields and low environmental impact. Planting rape on winter fallow fields could allow for seasonal rotation between the bioenergy production and agricultural production. In the present study, the Global Agro-Ecological Zones model was used to estimate the production potential of rapeseed on winter fallow fields in the Yangtze River region from 2010 to 2015. Life cycle assessment was then conducted to calculate energy efficiency and greenhouse gas emissions from the entire energy-producing process and to estimate the number of bioenergy enterprises and their spatial distribution. The results indicated that the total area available of winter fallow fields in the Yangtze River region was 24.93millionha, accounting for 34.2% of the total cultivated land area. The total yield of winter rapeseed was up to 46.41milliontons (an average yield of 1.86tons/ha). Thus, the study area could potentially produce net energy of up to 3564millionMJ with energy return on energy investment (EROEI) as high as 1.52-1.84. The total reduction of greenhouse gas emissions may be up to 23.28milliontons, and the total number of bioenergy enterprises could be 589, from which the total biodiesel output could be 167.5milliontons. Hubei, Henan, Anhui and Jiangxi should be prioritized for generating biofuels from rapeseed planted on winter fallow fields.
油菜是一种非粮饲料原料，具有高油产量和低环境影响等特点，适合生物燃料生产。在冬季休耕地上种植油菜，可以实现生物能源生产和农业生产的季节性轮作。本研究利用全球农业生态区模型估算了 2010-2015 年长江流域冬季休耕地上油菜的生产潜力。然后采用生命周期评估方法，计算了整个能源生产过程的能源效率和温室气体排放，并估算了生物能源企业的数量及其空间分布。结果表明，长江流域冬季休耕地上的总面积为 2493 万公顷，占耕地总面积的 34.2%。冬油菜的总产量高达 4641 万吨（平均产量为 1.86 吨/公顷）。因此，研究区的油菜种植可能潜在地产生高达 3564 亿兆焦耳的净能量，能源投资回报率（EROEI）高达 1.52-1.84。温室气体减排总量可能高达 2328 万吨，生物能源企业总数可达 589 家，生物柴油总产量可达 16750 万吨。湖北、河南、安徽和江西应优先考虑利用冬季休耕地上种植的油菜生产生物燃料。
