GHG emissions of straw treatments in rural China and scenario simulation based on life cycle perspective. (1st December 2022)

• Record Type: Journal Article
• Authors: Xu, Xiangbo; Ye, Yuhan; Li, Jing; Xu, Zhiyu; Sun, Mingxing; Li, Chang; Zhang, Linxiu; Xue, Yinghao
• Is Part Of: Journal of cleaner production. Volume 377(2022)
• Publication Date: 2022-12-01
• Subjects: Crop straw -- Straw utilization -- Life cycle -- GHG emissions -- Scenario simulation; Factory and trade waste -- Management -- Periodicals; Manufactures -- Environmental aspects -- Periodicals; Déchets industriels -- Gestion -- Périodiques; Usines -- Aspect de l'environnement -- Périodiques; 628.5
• DOI: 10.1016/j.jclepro.2022.134377
• Languages: English
• ISSNs: 0959-6526

Abstract

Abstract: The comprehensive utilization of straw plays an important role in GHG emissions reduction. The main breakthrough point of promoting straw resource utilization in China is on staple crops. In this study, the current straw utilization and treatment status of staple crops in rural China were studied based on data from the 2019 China Rural Development Survey, which included five provinces, 100 villages, and 1015 households. A life cycle assessment was conducted to identify the GHG emissions of the various crop straw utilization and treatment methods. The GHG emissions per unit area from the crop and household perspectives were also observed. Furthermore, the trend in GHG emissions from crop straw utilization and treatment was predicted through scenario simulation. The results showed that the comprehensive utilization rates of rice straw and wheat straw in rural China were 85.30% and 98.41%, respectively, in 2018, whereas the comprehensive utilization rate of maize straw was only 40.25%. Rice straw has the highest GHG emission level of 11771.90 kgCO2 -eq/ha from a long-term perspective. On a national scale, the average GHG emissions per unit area of household is 1229.56 kgCO2 -eq/ha, with significant differences between provinces, from a maximum of 12033.77 kgCO2 -eq/ha in Jiangsu to a minimum of −3599.77 kgCO2 -eq/ha in Jilin. According to the results of the scenario simulation, if the ambitious measures in reducing the straw incorporated into paddy soil are not taken, future GHG emissions of staple crop straw may persist and even rise rapidly in rural China. Graphical abstract: Image 1 Highlights: Realizing the resource utilization of straw in China mainly depends on staple crops. Straw utilization rates of rice and wheat exceed 85%, but only 40.25% for maize. The order of GHG emission intensity of straw of staple crops is rice > wheat > maize. The GHG emissions of crop straw at household level is 1229.56 kgCO2 -eq/ha in China. Without measures, the life-cycle GHG emissions of crop straw will continue to rise.