| Effects of exogenous sulfur on volatile sulfur gases emitting from the farmland |
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| DOI：10.7606/j.issn.1000-7601.2017.03.39 |
| Key Words: additives exogenous sulfur farmland soil volatile sulfur gases emission |
| Author Name | Affiliation | | GAO Zhen-zhen | Department of Chemical Engineering, Xinjiang Agricultural University, Urumqi, Xinjiang 830052, China
Lv Huan Environmental Science and Technology Research Institute in Bayingolin Prefecture, Korla, Xinjiang 841000, China | | WANG Li-ling | Department of Chemical Engineering, Xinjiang Agricultural University, Urumqi, Xinjiang 830052, China | | JING Wei-wen | Department of Chemical Engineering, Xinjiang Agricultural University, Urumqi, Xinjiang 830052, China |
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| Abstract: |
| In this paper, the influences of different exogenous sulfur and environmental conditions on the emissions of volatile sulfur gases from soil were investigated by gas chromatography for the representative farmland soil samples in arid area of Xinjiang. The results showed that sources of exogenous sulfur had different influences on the kind and the amount of volatile sulfur gases emitting from incubation soils. Volatile sulfur gases released from the soil with cystine, cysteine, methionine, sodium sulfate and sodium thiosulfate addition contributed fewer to total sulfur emission, being 1.71%, 0.52%, 11.5%, 0.0016% and 0.0014%, respectively. The conversion rate was the highest for methionine but lowest for inorganic sulfate. Organic sulfur acted as a major contributor to volatile sulfur gases emission from soil. As the main product, H2S accounted for 97.9% and 90.8% of the total emissions from cystine and cysteine by microbial decomposition. CH3SH was the main product detected from methionine decomposition and accounted for 88.3% of the total emissions. The amounts of volatile sulfur gases were positively proportional to the amounts of added cysteine (1～10 mg·g-1). The influence of added carbon and nitrogen fertilization was related to the kind of evolved volatile sulfur gases. Incubation conditions such as the soil types and irrigation water had substantial effect on sulfur gases emissions, with the moisture in incubation soil having the larger influence. |
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