农业常用有机物料中水溶性有机物的理化性质特征

以水稻土水溶性有机物(DOM)为对照,采用物理化学和光谱学实验研究了农业上常用有机物料:猪粪、绿肥和污泥DOM的理化性质差异.结果表明,水稻土、污泥、猪粪和绿肥DOM含量分别为122, 23793, 12904, 380560mgC/kg.若施用等量有机物料,带入土壤的DOM量最多的应是绿肥.不同有机物料DOM中大分子组分含量高低顺序为:水稻土(51.08%)>猪粪(41.25%)>污泥(23.33%)>绿肥(7.36%);而极性组分含量的顺序则相反,水稻土(10.71%)猪粪DOM(1.12)>污泥DOM(1.11)>绿肥DOM(0.98),紫外图谱也证实了这一点.

Fractionation and characterization of dissolved organic matter derived from different organic material commonly applied in agriculture

Since environmental behavior and effect of dissolved organic matter depend mainly on its physicochemical properties,a series of physicochemical and spectroscopic experiments was employed to investigate fractionation and characterization of dissolved organic matter(DOM)derived from pig manure,sewage sludge and green manure,commonly applied in agriculture.The contents of DOM were 122,23793,12904 and 380560 mg C/kg for paddy soil,sewage sludge,pig manure and green manure,respectively. On the basis of the content of high molecule fraction,the DOM could be arranged in the following order：paddy soil(51.08%)>pig manure(41.25%)>sewage sludge (23.33%)>green manure(7.36%).The tendency in content of polar fraction was reverse,i.e.,paddy soil(10.71%)pig manure DOM(1.12)>sewage sludge DOM(1.11)>green manure DOM(0.98),and UV spectra of DOM further confirmed the order.