Tissues Sulfur Content And Sulfur Isotope Of Rape For Tracing Sulfur Source In Jiangxi Province

Nowadays, with the rapid development of industrial economy, air pollution is becoming more and more serious. With the strict control of the atmospheric pollutants emission and pollution control measures, atmospheric sulfur deposition is still on the rise, and acid rain cover area is also increasing year by year. At the time of global area paid high attention to atmospheric sulfur pollution, the problem of S-deficient soils in agricultural have got attention step by step. In order to explore the reliability of using oilseed rape to trace sulfur source, and to research the spatial distribution of atmospheric sulfur deposition, this paper packed rhizosphere soils and rape issues included root, stem, pod and rape seed in21sampling sites at the places of Fengcheng, Chongren, Yingtang. Guixi, Dexing, Jingdezhen and Nanchang in Jiangxi Province, and determined sulfur content and sulfur isotope values of rape and soil. And also, this paper used spatial analysis to analysis sulfur content and sulfur isotope of rape and soil in Jiangxi Province. Combined with the correlation significant difference analysis and box plots mathematical statistics, investigate the relationship of soil sulfur environment and atmospheric sulfur environmental, and rape issues sulfur isotope values between atmospheric sulfur isotope values and soil sulfur isotope values. Discuss the sulfur source of rape issue in Jiangxi Province, and the significant difference of sulfur content and sulfur isotope in rural, suburbs and urban areas. With this study, we can get a rationale about tracing sulfur source of vascular plant species.The results show:(1) In Jiangxi Province, there is not an obvious difference in soil total-S content, and soil soluble-S content is much lower than soil total-S content, but no correlation between them. Soil total-S δ34S values are higher than soil soluble-S δ34S values, and in every areas, Soil total-S δ34S values have not a big difference, but soil soluble-S δ34S values are not the same. In Jiangxi Province, moss tissue have high sulfur content and low δ34S values, but rhizosphere soil total-S have low sulfur content and high δ34S values. It is said that atmospheric sulfur content is higher relatively and easy enrichment "light sulfur", but soil total-S content is lower and easy enrichment "heavy sulfur". Moss tissues δ34S values and soil soluble-S δ34S values are almost equally, declared that the source of soil soluble-S are from dry and wet atmospheric SO2deposition.(2) In Jiangxi Province about rape, sulfur content of rape seed are much higher than root, stem and pod, and the other three parts are almost equally. Contrast the four parts of rape tissues, the834S values from root to rape seed reduce in turns, beyond several samples of stem or pod have higher δ34S values caused by isotope fractionation. The reason why rape seed834S values are lowest because that rape have large demand for S at the stage of rape seed growth, and soil S is far from the quantity demanded for rape, and rape tissues absorb atmospheric sulfur with low δ34S values largely at this stage, and almost all tissues S are stored in rape seed, so rape seed enrich much more "low sulfur", and have low δ34S values.(3) In Jiangxi Province, tissues sulfur isotope and sulfur content of root, stem and pod showed a negative linear correlation, and the correlation are significant in pods. According to two-sulfur source model, rape in Jiangxi Province may be affected by a combined sulfur source, which one is soil sulfur source with stable sulfur content and high δ34S values, and the other one is atmospheric sulfur source with shifty sulfur content and low δ34S values.(4) At rural, suburb and urban areas in Nanchang. rhizosphere soils total-S content are all close to. However, every parts of rape tissue sulfur content are higher at suburb and urban areas than at rural areas. It is because that atmospheric sulfur source contributes more to rape tissues grown at suburb and urban with same soil background value. Caused of atmospheric sulfur source have the largest contribution for rapeseed, the sulfur content of rape seed at suburb and urban are much higher than at rural areas. But contrast the samples between suburb and urban places, the rape tissues sulfur content are almost same, indicated that with the development of industry, as well as the resident population gradually moving to suburb places, atmospheric pollution extent in suburb areas are closed to urban in Nanchang.(5) Soil total-S δ34S values at rural areas are slight higher than at suburb and urban in Nanchang, and at suburb and urban Soil total-S δ3S values are almost same, according to this result, we can conclude that in Nanchang suburb and urban areas have same sulfur sources, but rural areas have different sulfur sources. For rape stem and pod tissues δ34S values, rural samples are the highest, and then suburb samples, the lowest are urban samples, it is because that at these three areas, soil δ34S values are almost equally, but atmospheric δ34S values are different, so rape tissues have different834S values which grown at rural, suburb, and rural areas. All these differences tell us that atmospheric sulfur source contribute to rape tissues of stem and pod. To rape root,δ34S values are not different at those three areas, the result are same with rhizosphere soil, so we can conclude that atmospheric sulfur source contribute little to rape root, the rape tissues sulfur of root most absorbed from soil sulfur source. To rape seed, seed have same sulfur content which grown at urban and suburb, but samples834S values at urban areas are lower than at suburb areas, and atmospheric sulfur δ34S values at urban are also lower than suburb and rural areas, so we can get a conclusion that atmospheric sulfur source impact rape seed greatly.