长期定位施肥棕壤硫素时空变异及生物有效性研究

针对近年来作物单位面积产量和复种指数不断提高，有机肥投入数量不足和无硫及低硫化肥的应用，加之工业排放SO2量的严格控制，投入土壤硫素逐渐减少的现状，在棕壤肥料长期定位试验基础上，进行土壤硫素不同形态含量、时空变异特性、主要影响因素和植物硫素生物有效性研究。揭示长期施肥条件下不同轮作体系（玉米-玉米-大豆）土壤 硫素化学行为和生物有效性规律。了解长期不同施肥处理对土壤供硫潜力和化学行为的影响；为合理施用硫肥和植物硫素高效利用提供理论依据；为深入了解土壤硫素循环及碳、氮、硫交互作用奠定基础。

With increase of the crop yield and cropping index, and insufficient supply of organic fertilizer, however excessive use of the Sulfur-deficient chemical fertilzer in soil, additionaly, decrease of S input from industrial emmission to soil, the S content was reduced constantly in recent years. In present study, content and spatiotemporal variability of S will be investigated, and effect of S on the plant growth and related influencing factors will be considered on the base of long-term location experiment in Braunerde.The research aims to explain chemical behaviour of S in soil and bioavailability of S to plant in corn-corn-soybean rotation system, and to discover effect of different fertilizer on the chemical behavious and supply potential of S. Results will provid theoretical basis to appropriate and efficient using S fertilizer and also will lay a foundation for thorough understanding the cycle of S and the interaction of S and C, N in soil.