东北黑土有机硫矿化动力学特征及其影响因素  

DYNAMICS OF SOIL ORGANIC SULFUR MINERALIZATION IN BLACK SOILS OF NORTHEAST CHINA AND ITS AFFECTING FACTORS

作　　者：迟凤琴[1] 张玉龙[2] 汪景宽[2] 魏丹[1] 周宝库[1] 张喜林[1] 

机构地区：[1]黑龙江省农业科学院土壤肥料研究所,黑龙江省土壤环境与植物营养重点实验室,哈尔滨150086 [2]沈阳农业大学土地与环境学院,沈阳110161

出　　处：《土壤学报》2008年第2期288-295,共8页Acta Pedologica Sinica

基　　金：国家重点基础研究发展规划项目(G1999011810);国家科技支撑计划项目(2006BAD05B05)资助

摘　　要：利用开放培养系统分别在20℃和30℃条件下，研究了不同地区（北安、海伦、公主岭）黑土和黑土在不同施肥条件下有机硫的矿化特征。结果表明：在好气培养条件下，黑土有机硫累积矿化量随培养时间的增加不断增加，两者之间的数量关系遵从一级动力学模式，前4周的矿化量占14周矿化总量的50％～62％。公主岭黑土有机硫的供硫潜力最大，且矿化速率快，供硫强度较北安、海伦高。温度越高土壤有机硫矿化势值越大，矿化化学反应速率常数也越大，半衰期越短。长期肥料定位试验地土壤有机硫的矿化势依次为施用有机肥（M）〉有机肥＋NPK（MNPK）〉NPK（NPK）〉未施肥（CK），表明施用有机肥可提高土壤供硫潜力。可见，施用有机肥对维持黑土有机硫肥力具有重要作用。An open incubation method was used. Samples of black soils, collected from different areas （Beian, Hailun, and Gongzhuling） and plots of a long-term fertilization experiment, were incubated aerobically at 20℃or 30℃, respectively to study characteristics of organic S mineralization in the soils. Results show that in aerobic incubation, cumulative organic S mineralization increased with the time going on, followed the first-order kinetic model. The cumulative organic S mineralization in the first 4 weeks accounted for 50% - 62 % of the total mineralization in 14 weeks. The black soil in Gongzhuling was the highest in S supply capacity, and stronger in S supply intensity and quicker in organic S mineralization rate than in Hailun and Beian. The higher the temperature, the higher the mineralization potentiality of organic S, the higher the velocity constant of mineralization reaction, and the shorter the half-life period. In terms mineralization potential of organic S in the long term fertilization experiment, the treatments were in the order of M 〉 MNPK 〉 NPK 〉 CK, showing that organic fertilizer was the major source of soil organic S, and improved soil S supply capacity.

关 键 词：黑土 有机硫 矿化动力学 影响因素 

分 类 号：S153[农业科学—土壤学]