不同环境因子对南方典型蔗田土壤羰基硫通量的影响

发布时间：2018-07-14 07:22

【摘要】：为探讨全球气候变化对土壤羰基硫(COS)的影响,本研究以南方典型蔗田土壤作为研究对象,室内模拟不同环境因子(温度、含水率和大气CO_2浓度),利用动态箱/GC-MS分析了原位和异位土壤COS通量。结果表明,土壤原位土和异位土COS通量差异较大,原位土COS吸收速率小于异位土,而释放速率大于异位土。土壤灭菌后COS的吸收显著降低,表明土壤COS吸收是一个生物过程。温度对异位土壤COS吸收影响较大,25℃异位土壤COS吸收最小,为100.4 pmol·m~(-2)·s~(-1);土壤含水量对原位土壤COS吸收影响最大,50%的土壤最大持水量条件COS吸收最小,为0.9 pmol·m~(-2)·s~(-1);大气CO_2浓度增加抑制原位土释放COS。因此,在研究土壤COS通量时,需综合考虑土壤结构、土壤温湿度和大气CO2浓度的影响。
[Abstract]:In order to study the effect of global climate change on soil carbonyl sulfur (COS), the soil of typical sugarcane field in southern China was used as the research object, and different environmental factors (temperature, temperature) were simulated in laboratory. In situ and ectopic soil COS fluxes were analyzed by dynamic chamber / GC-MS. The results showed that the COS fluxes of in-situ soil and heterotopic soil were significantly different. The COS absorption rate of in-situ soil was lower than that of heterotopic soil, but the release rate of COS was higher than that of heterotopic soil. The absorption of COS was significantly decreased after soil sterilization, indicating that the absorption of COS in soil was a biological process. The effect of temperature on the absorption of COS in heterotopic soil was greater than that in 25 鈩，

本文编号：2120904