干旱增加了土壤中的根和根系沉积碳投入
Elena Kost1, Dominika Kundel2, Matti Barthel1
1Institute of Agricultural Sciences, Department of Environmental Systems Science, ETH Zürich, Zurich, Switzerland.
概括
干旱增加了植物根和根茎沉积的碳. 农场肥料的应用增强了干旱引起的根部反应,这表明它对土壤碳和营养吸收有好处.
科学领域:
- 农业科学 农业科学
- 土壤科学 土壤科学
- 植物生物学 植物生物学
背景情况:
- 干旱压力显著影响作物产量和植物健康.
- 植物通过改变根系和根茎沉积来适应干旱,以更好地获取资源.
- 农业管理实践影响根和根茎沉积反应,但它们与干旱的相互作用未得到充分研究.
研究的目的:
- 调查不同农业管理系统如何影响植物根和根茎沉积对干旱的反应.
- 评估生物动力学,混合常规和矿产常规作物系统在干旱条件下对地下碳动态的影响.
主要方法:
- 在长期实地研究中进行了一项半连续的13CO2同位素标记实验.
- 干旱是通过在不同的作物系统中在小麦田中使用雨水庇护所引起的.
- 分析了根系生物量,净根系沉积和根系微生物群.
主要成果:
- 干旱增加了总根碳,主要是通过精细的根生物质,特别是在使用农场肥料 (生物动力学和常规混合) 的系统中.
- 在所有系统中,干旱期间净根系沉积碳增加,特别是在土壤表层 (0.25米).
- 干旱改变了树根球微生物群,增加了一些促进植物生长的属,同时减少了参与固化的其他属.
结论:
- 干旱增加了通过细根和根茎沉积的地下碳输入.
- 在作物系统中应用农场便可以放大干旱引起的细根碳增加,可能改善土壤碳捕获和营养取.
- 纳入有机修改物的管理策略可能对提高作物对干旱的抵抗力至关重要.
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