不同处理池塘底泥氮矿化机制及有机氮组分矿化特征研究

采用Warning等的淹水培养法,研究了不同处理池塘底泥氮素的矿化特征,并对可矿化氮进行一级动力学方程模拟;采用Bremner法测定了底泥培养前后各有机氮组分含量,并通过通径分析确定了可矿化氮与各有机氮组分之间的关系。研究结果表明,采用不同处理组的底泥氮矿化的强度和容量都小于对照组,其中加入沸石的矿化容量最小,强度也最低,其次是加入微生物的处理,再次是加入脲酶抑制剂的处理;上覆水中氨态氮主要来自底泥酸解氮的矿化,其中氨基酸态氮矿化最大,酰胺态氮和氨基糖态氮次之,水解未知态氮降低最小;通径分析结果表明,在酸解氮中,酸解未知态氮与可矿化氮不相关,而氨基酸态氮、铵态氮、氨基糖态氮和未知态氮与可矿化氮的直接通径系数较大,说明这几种形态氮对可矿化氮皆有贡献。酰胺态氮对可矿化氮有很高的通径系数,表明了它对上覆水氨态氮的贡献最大。

Studies on Nitrogen Mineralization Mechanism and Organic Nitrogen Components of Mineralization in Different Treatments Pond Sediments

By the method of scholar Warning,flooding culture mineralization characteristics of N in sediments were studied in various ponds and mineralized nitrogen were simulated in the method of one-order dynamic model.By the method of scholar Bremner,various components of organic nitrogen were determined to define the relation between mineralized nitrogen and components of organic nitrogen by path analysis.The results showed that the processing of nitrogen mineralization was different in strength and capacity when treatment groups and control group were compared,for control group was much higher.The group adding zeolite had the lowest mineralization contents and strength.Mineralization contents and strength of the group adding urease enzyme inhibitors was much higher than those of the group adding microbial.Ammonium-N in the overlying water came from the sediment mineralization,acid amide N was mineralized most,ammonium nitrogen and amino sugar N were mineralized less and unidentified N was mineralized least.By experimental results,there existed no relation between unidentified N and mineralized nitrogen inhydrolizable N,there existed a significant direct path coefficient between acid amide N,ammonium nitrogen,amino sugar N and unidentified N and mineralized nitrogen,which showed that the above nitrogen all had a contribution to mineralized nitrogen,ammonium nitrogen had a significantly high path coefficient to mineralized nitrogen,which showed that ammonium nitrogen contributed most to ammonium-N in overlying water.