Institute for Environmental Studies, Faculty of Sciences & Environmental Centre, Charles University, Benátská 2, 12800, Prague, Czech Republic.
Sci Rep. 2018 Jul 4;8(1):10099. doi: 10.1038/s41598-018-28225-z.
The relationship between CO flow from soil and soil CO concentration was investigated at 72 permanent sampling points at two forested post-mining sites in the northwest of the Czechia. Based on the entire data set (72 points sampled monthly during the growing season), CO flow from the soil was positively correlated with soil CO concentration. CO concentration in deeper soil layers was positively correlated with root biomass and negatively correlated with soil microbial respiration. In individual sampling points relationship between CO flow and soil CO concentration varied from being significantly positive (30% of points) to significantly negative (7%) but mostly being non-significant (63%). The positive correlation occurred at points with high root biomass in deeper soil layers, while the negative correlation occurred at points with high soil microbial respiration per cm of soil. Laboratory experiments showed that the CO produced by microbial respiration can reduce microbial respiration but that CO produced by root respiration did not reduce root respiration. The results indicate that when soil ventilation is poor, microbial respiration can sufficiently increase soil CO concentration so as to reduce microbial respiration, which greatly increases the variability in the relationship between CO flow from soil and soil CO concentration.
对捷克西北部两个森林矿区的 72 个永久性采样点进行了土壤 CO 通量与土壤 CO 浓度之间关系的研究。基于整个数据集（在生长季节每月对 72 个采样点进行采样），土壤 CO 通量与土壤 CO 浓度呈正相关。深层土壤中 CO 浓度与根系生物量呈正相关，与土壤微生物呼吸呈负相关。在个别采样点，CO 通量与土壤 CO 浓度之间的关系从显著正相关（30%的采样点）到显著负相关（7%）不等，但大多数情况下无显著相关性（63%）。正相关发生在深层土壤中根系生物量较高的采样点，而负相关发生在土壤微生物呼吸速率较高的采样点。实验室实验表明，微生物呼吸产生的 CO 可以降低微生物呼吸，但根系呼吸产生的 CO 不会降低根系呼吸。研究结果表明，当土壤通气不良时，微生物呼吸可以充分增加土壤 CO 浓度，从而降低微生物呼吸，这极大地增加了土壤 CO 通量与土壤 CO 浓度之间关系的可变性。
