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虫和植物可以通过调节土壤湿度波动和土壤巨度来减少土壤温室气体排放,这是一个中宇宙实验
Pierre Ganault1,2,3,4, Johanne Nahmani2, Yvan Capowiez5
1ECODIV, INRAE, Normandie Université, UNIROUEN, Rouen, France.
PloS one
|February 15, 2024
概括
虫和植物不会增加温室气体 (GHG) 排放,但可能会减少排放. 特别是内生性虫,可以通过改变土壤结构和水分来降低氧化 (N2O) 排放.
科学领域:
- 土壤科学 土壤科学
- 生态生态学 生态生态学
- 环境科学 环境科学
背景情况:
- 虫可以增强土壤微生物活动,可能增加温室气体 (GHG) 排放.
- 在植物和土壤水分波动的存在下,虫对温室气体排放的影响,受到虫挖掘的影响,尚未完全理解.
研究的目的:
- 调查不同地物种 (无菌,内生,两种) 和植物对土壤二氧化碳和二氧化排放的影响.
- 评估土虫挖掘如何影响土壤水动态及其随后对温室气体排放的影响.
- 检查土壤巨孔性 (由产生的) 与温室气体排放之间的关系.
主要方法:
- 使用简化农业条件进行了为期3个月的温室中宇宙实验.
- 在干湿循环期间,Mesocosms 整合了排水系统,以模拟虫诱导的水流变化.
- 监测了土壤的二氧化碳和二氧化排放,土壤巨孔性 (通过X射线断层扫描),以及水含量.
主要成果:
- 累计的N2O排放量在虫存在时显著降低 (34.6-44.8%),在植物存在时降低了19.8%.
- 随着内地或混合的存在,二氧化碳排放量略有减少 (5.9-11.4%),而植物增加了6%的二氧化碳.
- 虫,植物和土壤中的水含量相互作用影响了N2O排放,这与土壤干燥因洞穴排水和蒸发转化有关. 温室气体排放量随着上层土壤巨孔体积的增加而减少.
结论:
- 在考虑到植物和虫对土壤水分的影响的实验条件下,虫不会增加温室气体排放.
- 内生性虫,以及它们与内生性虫物种的组合,可能会减少N2O排放.
- 土虫引起的土壤结构 (巨孔性) 和水动态的变化在调节温室气体流量方面发挥着关键作用,通过减少微生物活动和无氧微观站点可能减轻排放.
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