State Key Laboratory of Grassland Agro-ecosystems, School of Life Sciences, Lanzhou University, Lanzhou, Gansu 730000, China.
Ministry of Education Key Laboratory for Earth System Modeling, Department of Earth System Science, Tsinghua University, Beijing, China.
Sci Total Environ. 2022 Feb 25;809:151998. doi: 10.1016/j.scitotenv.2021.151998. Epub 2021 Nov 29.
With the rapid socio-economic development in China, poverty alleviation and the reduction of the environmental footprint in the plastic film mulching (PM) planting system have become key to sustainable agricultural production. Although many studies have evaluated the maize yield, agricultural economic benefits, and greenhouse gas (GHG) emissions associated with PM through small-scale field experiments, identifying suitable PM regions in combination with their demographic characteristics and the future development of such systems has received little attention. This study combines a Denitrification-Decomposition (DNDC) model and demographic characteristics to determine the optimum PM region in rainfed areas of the Loess Plateau in northwest China. The results demonstrated that PM produced a higher maize yield, agricultural net profit (ANP), and cost-benefit ratio compared to a control treatment (CK) without PM. An agricultural income far above the poverty level would assist in meeting the goals of alleviating poverty and building a prosperous society. In addition, the PM system produced more GHG emissions, but had a lower greenhouse gas intensity (GHGI) than CK under both low (200 kg N ha) and high (300 kg N ha) nitrogen (N) fertilizer rates. This study developed a framework to evaluate maize yield alongside economic and environmental indicators. We concluded that PM should be adopted in areas with precipitation less than 500 mm, and concentrated in the region with rainfall of 200-400 mm. The results provide a theoretical basis for the sustainable development of the PM maize planting system, and will contribute to the desired goal of environmentally sustainable agricultural production.
随着中国社会经济的快速发展，在塑料薄膜覆盖（PM）种植系统中实现减贫和减少环境足迹已成为可持续农业生产的关键。虽然许多研究通过小规模田间试验评估了 PM 与玉米产量、农业经济效益和温室气体（GHG）排放之间的关系，但结合人口特征和未来系统发展来确定适合的 PM 区域却很少受到关注。本研究结合 Denitrification-Decomposition（DNDC）模型和人口特征，确定了中国西北黄土高原雨养区的最佳 PM 区域。结果表明，PM 处理比无 PM 处理（CK）的玉米产量、农业净收益（ANP）和成本效益比更高。农业收入远高于贫困水平将有助于实现减贫和建设繁荣社会的目标。此外，在低（200 kg N ha）和高（300 kg N ha）氮肥水平下，PM 系统产生的 GHG 排放更多，但 GHGI 低于 CK。本研究建立了一个评估玉米产量以及经济和环境指标的框架。我们得出结论，PM 应在降雨量小于 500 mm 的地区采用，并集中在降雨量为 200-400 mm 的地区。这些结果为 PM 玉米种植系统的可持续发展提供了理论基础，并将有助于实现环境可持续农业生产的预期目标。
