Hainan Key Laboratory for Sustainable Utilization of Tropical Bioresources, College of Tropical Crops, Hainan University, Haikou, 570228, China.
College of Agronomy, Northwest A&F University, Yangling, 712100, China.
Sci Rep. 2021 Apr 30;11(1):9367. doi: 10.1038/s41598-021-88717-3.
The well-irrigated planting strategy (WI) consumes a large amount of energy and exacerbates greenhouse gas emissions, endangering the sustainable agricultural production. This 2-year work aims to estimate the economic benefit, energy budget and carbon footprint of a wheat-maize double cropping system under conventional rain-fed flat planting (irrigation once a year, control), ridge-furrows with plastic film mulching on the ridge (irrigation once a year, RP), and the WI in dry semi-humid areas of China. Significantly higher wheat and maize yields and net returns were achieved under RP than those under the control, while a visible reduction was found for wheat yields when compared with the WI. The ratio of benefit: cost under RP was also higher by 10.5% than that under the control in the first rotation cycle, but did not differ with those under WI. The net energy output and carbon output followed the same trends with net returns, but the RP had the largest energy use efficiency, energy productivity carbon efficiency and carbon sustainability among treatments. Therefore, the RP was an effective substitution for well-irrigated planting strategy for achieving sustained agricultural development in dry semi-humid areas.
良好灌溉种植策略（WI）消耗大量能源，加剧温室气体排放，危及可持续农业生产。这项为期两年的工作旨在评估中国干旱半湿润地区传统雨养平作（每年灌溉一次，对照）、垄膜沟灌（每年灌溉一次，RP）和 WI 条件下小麦-玉米复种系统的经济效益、能源预算和碳足迹。与对照相比，RP 显著提高了小麦和玉米的产量和净收益，而与 WI 相比，小麦产量明显下降。在第一个轮作周期中，RP 的效益成本比对照高 10.5%，但与 WI 没有差异。净能源输出和碳输出与净收益呈相同趋势，但 RP 在处理中具有最大的能源利用效率、能源生产力碳效率和碳可持续性。因此，RP 是替代良好灌溉种植策略的有效方法，可实现干旱半湿润地区的可持续农业发展。
