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首页> 美国卫生研究院文献>Scientific Reports >Biochar influences on soil CO2 and CH4 fluxes in response to wetting and drying cycles for a forest soil
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Biochar influences on soil CO2 and CH4 fluxes in response to wetting and drying cycles for a forest soil

机译：生物炭对森林土壤湿润和干燥循环的影响对土壤CO2和CH4通量的影响

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Biochar has been the focus of significant research efforts in agriculture, but little research has been conducted in forested ecosystems. Here, we assess CO2 and CH4 fluxes from a forest soil in response to biochar additions using a before-after-control-intervention experimental design. Soil CO2 and CH4 fluxes were measured over a series of wetting cycles by coupling soil mesocosms equipped with auto-chambers to a laser-based spectrometer for high-frequency measurements of gas fluxes and related soil processes. We found that soil CO2 fluxes were higher and CH4 fluxes were less negative (e.g. reduced CH4 uptake) for the biochar-amended soil compared to the no biochar condition. Furthermore, biochar improved soil infiltrability under wet conditions, and enhanced soil moisture levels under dry conditions. Biochar additions shifted the point of maximum soil respiration (i.e. soil CO2 efflux) to a slightly wetter soil moisture level. The point of maximum CH4 uptake was also shifted to a slightly wetter moisture level for soil with biochar. Overall differences in soil gas fluxes were found to be minor compared to the increase in soil carbon resulting from the biochar addition. Biochar may thus contribute to improved forest management through increases to soil carbon stocks and improved soil moisture levels.
机译：生物炭一直是农业方面重大研究工作的重点，但是在森林生态系统中进行的研究很少。在这里，我们使用控制干预后的实验设计评估了响应生物炭添加而产生的森林土壤中的CO2和CH4通量。通过将配备有自动腔室的土壤中观与基于激光的光谱仪耦合，可以在一系列的润湿周期内测量土壤CO2和CH4的通量，以进行气体通量和相关土壤过程的高频测量。我们发现，与无生物炭条件相比，生物炭改良土壤的土壤CO2通量较高，而CH4通量的负值较小（例如减少的CH4吸收）。此外，生物炭改善了在潮湿条件下的土壤渗透性，并在干燥条件下提高了土壤水分含量。添加生物炭将最大土壤呼吸点（即土壤CO2外排）转移到稍湿的土壤水分水平。对于含有生物炭的土壤，最大CH4吸收点也移到了稍湿的水分含量。与添加生物炭导致的土壤碳增加相比，发现土壤气体通量的总体差异很小。因此，生物炭可通过增加土壤碳储量和改善土壤湿度来有助于改善森林管理。

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