添加外源硫对农田土壤挥发性含硫气体释放的影响

发布时间：2018-09-12 21:02

【摘要】：选择新疆地区代表性农田土壤为样品,采用气相色谱法进行测定,通过室内培养的方式考察了各种添加外源硫和环境条件对土壤挥发性含硫气体释放的影响。结果表明:不同添加源对挥发性含硫气体种类及数量的影响各不相同。添加胱氨酸、半胱氨酸、甲硫氨酸、硫酸钠和硫代硫酸钠后,释出的挥发性含硫气体在总硫中所占的比例依次为1.71%、0.52%、11.5%、0.0016%和0.0014%,表明转化率均较低,其中无机硫的转化率最低,甲硫氨酸的转化率最高,有机硫是主要来源。在土壤微生物分解作用下,胱氨酸、半胱氨酸的主要分解产物是H2S,分别占总释放量的97.9%、90.8%;甲硫氨酸能够释放较多的CH3SH气体,占总释放量的88.3%。在一定范围内(1~10 mg·g-1),含硫气体的释放量随半胱氨酸添加量的增加而增加。碳、氮源加入的影响与挥发性含硫气体的种类有关。环境条件对挥发性含硫气体的释放也有影响,培养用水的影响远高于土壤类型,是相对重要的因素。
[Abstract]:The effects of adding exogenous sulfur and environmental conditions on the release of volatile sulfur gases from soils in Xinjiang were investigated by gas chromatography. The results showed that the effects of different additive sources on the species and quantity of volatile sulfur-containing gases were different. When cysteine, methionine, sodium sulfate and sodium thiosulfate were added, the proportion of volatile sulfur gases released in the total sulfur was 1.71% and 0.52%, respectively, and 0.0016% and 0.0014% respectively, indicating that the conversion rate of inorganic sulfur was the lowest. The conversion rate of methionine is the highest and organic sulfur is the main source. The main decomposition products of cystine and cysteine were H _ 2S, which accounted for 97.9% and 90.8% of the total release amount, respectively, and methionine could release more CH3SH gas, accounting for 88.3g% of the total release amount. In a certain range (1 ~ 10 mg g ~ (-1), the release of sulfur gas increased with the increase of cysteine content. The effect of the addition of carbon and nitrogen sources is related to the species of volatile sulfur-containing gases. Environmental conditions also affect the release of volatile sulfur gases, and the effect of cultivation water is much higher than that of soil type, which is a relatively important factor.
【作者单位】：新疆农业大学化学工程学院;巴州绿环环境科学技术研究所;
【基金】：国家自然科学基金(41263004) 霍英东教育基金(111019)
【分类号】：S153

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