生物炭应用以减少农田的二氧化碳排放和增加作物产量:基于大数据分析和理想场景建模的22年研究
Can Chen1,2, Kexin Wang3, Peng Cai4
1College of Applied Meteorology, Nanjing University of Information Science and Technology, Nanjing, 210044, The People's Republic of China. chencan2010203@sohu.com.
概括
应用特定的生物炭条件,例如在400-500°C使用小麦和大米,可以提高作物产量并减少农田二氧化碳 (CO2) 排放. 最佳的土壤条件和生物炭应用率是这种农业环境效益的关键.
科学领域:
- 农业科学 农业科学
- 环境科学 环境科学
- 土壤科学 土壤科学
背景情况:
- 从农田减少温室气体二氧化碳 (CO2) 排放,提高作物产量是农业环境的关键挑战.
- 生物炭是一种强大的土壤调节剂,为解决这些问题提供了重要的研究和应用潜力.
研究的目的:
- 调查生物炭应用对中国北方农田土壤二氧化碳排放潜力和作物产量的影响.
- 确定最佳的生物炭特性和应用条件,以增加作物生产和减轻二氧化碳排放.
主要方法:
- 大数据分析和建模技术被用来研究生物炭对中国北部农田的影响.
- 对微生物生物质,土壤呼吸率,土壤有机物,土壤水分,平均土壤温度和二氧化碳排放进行了相关性和路径分析.
- 开发了一种多步回归方程,以量化二氧化碳排放和影响因素之间的关系.
主要成果:
- 改善作物生产和减少二氧化碳排放的理想场景涉及特定的生物炭特性 (小麦/大米料原料,400-500°C制备,80-90°C/N比,8-9 pH) 和土壤条件 (沙土/泥土,1.2-1.4 g cm−3散装密度,<6 pH,10-20 g kg−1有机物,<10 C/N).
- 最佳的生物炭应用涉及每年应用的20-40t ha-1.
- 微生物生物质和土壤呼吸率对二氧化碳排放产生了直接,极为显著的影响 (P<0.01),其次是土壤有机物,水分和温度. 间接关系是通过土壤温度,微生物生物质和呼吸速率最强的.
结论:
- 在最佳条件下,生物炭的应用提供了一个可行的策略,可以同时提高作物产量和减少农田的二氧化碳排放.
- 了解土壤特性和微生物活动对二氧化碳排放的直接和间接影响,对于有效的生物炭管理至关重要.
- 该研究提供了一种定量模型 (Y = -27.981 + 0.6249 X1 + 0.5143 X2 + 0.4257X3 + 0.3165X4 + 0.2014X5) 用于根据关键的土壤参数预测二氧化碳排放.
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