Applied Chemistry Laboratory, College of Chemical Engineering, Xinjiang Agricultural University, Ürümqi, 830052, Xinjiang Uygur Autonomous Region, People's Republic of China.
College of Food and Pharmaceutical Sciences, Xinjiang Agricultural University, Ürümqi, 830052, Xinjiang Uygur Autonomous Region, People's Republic of China.
Environ Geochem Health. 2019 Oct;41(5):2195-2207. doi: 10.1007/s10653-019-00268-9. Epub 2019 Mar 14.
Due to the important roles of carbonyl sulfide (COS) and carbon disulfide (CS) in atmospheric chemistry, this study was designed to determine different proportions of COS and CS fluxes contributed from different sources, i.e., vegetation, soil and roots, at monthly and hourly timescales in the arid area in Xinjiang, China. Results indicated that the seasonal net uptake of COS by vegetation was predominant in the growing season. The CS fluxes from vegetation and soils had no significant seasonal variations compared with COS. The exchange rates of COS and CS have been found to be stimulated by the addition of nutrients in the form of urea fertilizer. Compared with the results of plots that were treated only with nitrogen, the treatments with both nitrogen and sulfur displayed no significant difference in the exchange fluxes. The results of compartment experiments indicated that the aboveground plants had the highest uptake of COS and had a vital role in the uptake of COS during the main growth period. The shares of COS emissions from the soil and roots increased to 6-17% and 55-58%, respectively, in the total COS fluxes when conditions, such as drought and senescence, were unfavorable for the developmental of vegetation. Observations of the preliminary diurnal fluxes indicated that the fluxes that occurred at night, with contributions from soils and plants, accounted for 27% of the total daily uptake of COS uptake. These quantitative results may be reasonably accounted for the use of COS as a promising tracer to obtain independent constraints on terrestrial carbon exchange at regional to global scales for their response to special environmental conditions in semiarid area.
由于羰基硫 (COS) 和二硫化碳 (CS) 在大气化学中的重要作用，本研究旨在确定不同比例的 COS 和 CS 通量来自不同的来源，即在新疆干旱地区的植被、土壤和根系，分别在月和小时尺度上。结果表明，植被对 COS 的季节性净吸收在生长季节占主导地位。与 COS 相比，植被和土壤的 CS 通量没有明显的季节性变化。已经发现 COS 和 CS 的交换率受到尿素等形式的养分添加的刺激。与仅用氮处理的结果相比，用氮和硫处理的结果在交换通量方面没有显著差异。隔室实验的结果表明，地上植物对 COS 的吸收最高，在主要生长期间对 COS 的吸收起着重要作用。当土壤和植物的发育不利于植被时，土壤和根系的 COS 排放量分别增加到总 COS 通量的 6-17%和 55-58%。初步的日通量观测表明，夜间发生的通量，来自土壤和植物的贡献，占 COS 总日吸收量的 27%。这些定量结果可以合理地解释使用 COS 作为一种有前途的示踪剂，以获得对陆地碳交换的独立约束，以响应半干旱地区特殊的环境条件。
