外加营养物对干旱区土壤硫交换通量的影响

发布时间：2019-05-14 20:33

【摘要】：应用静态箱式采样法,利用热解析仪与气相色谱联用的方法进行定量分析,研究不同营养添加物对干旱区水稻田土壤挥发性有机硫化物(VOSCs)地-气交换通量的影响。结果显示:在稻田土壤中施入不同的营养添加物后,除硫酸钠外,其余添加物质均可以促进VOSCs的释放;作为有机硫源,甲硫氨酸和半胱氨酸的添加明显地提高了土壤VOSCs的释放通量,表明含硫氨基酸是VOSCs的有效前体,淹水稻田土中的微生物通过分解作用释放VOSCs,释放的气体除了有大量的COS(羰基硫)和CS_2(二硫化碳)外,还有少量的DMS(二甲基硫)、CH_3SH(甲硫醇)以及DMDS(二甲基二硫);作为氮、硫源,硝酸铵和硫酸铵均可促进VOSCs的释放,但硫酸铵的作用时间相对较长,这主要归因于氮源和硫源的共同作用;碳源也能少量地促进VOSCs的释放。另外,培养条件(如温度等)对VOSCs的地-气交换通量也有一定的影响。
[Abstract]:The effects of different nutrient additives on (VOSCs) land-gas exchange flux of volatile organic sulfides in paddy soil in arid area were studied by static box sampling method and combined with thermal analyzer and gas chromatography. The results showed that the release of VOSCs could be promoted by adding different nutritional additives in paddy soil except sodium sulfate. As organic sulfur sources, the addition of methionine and cysteine significantly increased the release flux of VOSCs in soil, indicating that sulfur-containing amino acids were effective precursors of VOSCs, and microorganisms in flooded paddy soils released VOSCs, through decomposition. In addition to a large amount of COS (carbonyl sulfur) and CS_2 (carbon disulfide), there are a small amount of DMS (dimethyl sulfur), CH_3SH (methyl mercaptan) and DMDS (dimethyl disulfide). As nitrogen and sulfur sources, ammonium nitrate and ammonium sulfate can promote the release of VOSCs, but the action time of ammonium sulfate is relatively long, which is mainly due to the combination of nitrogen source and sulfur source, and carbon source can also promote the release of VOSCs in a small amount. In addition, culture conditions (such as temperature, etc.) also have a certain effect on the ground-gas exchange flux of VOSCs.
【作者单位】：新疆农业大学化学工程学院;
【基金】：国家自然科学基金(41263004) 霍英东教育基金(111019) 大学生创新基金项目
【分类号】：S153

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