生物炭对淹水土壤中溶解性有机质含量及组成特征的影响  

Effects of Biochar on the Content and Composition of Dissolved Organic Matter in Flooded Soil

作　　者：索慧慧 林颖 赵苗苗 王坤 曲东[1] SUO Huihui;LIN Ying;ZHAO Miaomiao;WANG Kun;QU Dong(College of Natural Resources and Environment,Northwest A&F University,Yangling,Shaanxi 712100)

机构地区：[1]西北农林科技大学资源环境学院,陕西杨凌712100

出　　处：《水土保持学报》2019年第2期155-161,271,共8页Journal of Soil and Water Conservation

基　　金：国家自然科学基金项目(41571239)

摘　　要：为了探究生物炭对土壤中溶解性有机质(DOM)的影响,采用向水稻土中添加生物炭的厌氧泥浆培养试验,分析添加生物炭后对不同培养阶段的厌氧泥浆中水溶性有机碳(DOC)含量、DOM组成、荧光光谱特性及土壤中Fe(III)还原特征的影响。结果表明:添加生物炭可增加水稻土中DOC含量及影响紫外光谱特征值(SUVA_(254)),引起DOM组分种类和相对含量变化,不同类型土壤间的变化存在差异,酸性水稻土中的作用更为明显。水稻土中Fe(III)的还原效率在添加生物炭下得到促进,同时对土壤的初始pH也产生一定影响。相关分析结果揭示添加生物炭可通过调节SUVA_(254)、DOM组成和体系pH,从而影响厌氧水稻土中的硝酸盐还原、铁还原及产甲烷过程。In order to investigate the effect of biochar on dissolved organic matter (DOM) in soil,the anaerobic mud culture experiment of adding biochar to paddy soil was carried out to analyze the dissolved organic carbon (DOC) content,the composition of DOM,the fluorescence spectrum characteristics and the Fe (III) reduction in anaerobic mud during different culture stages after adding biochar.The results showed that the addition of biochar could increase the content of DOC in paddy soil and impact the ultraviolet spectrum characteristic value (SUVA 254),resulting in the changes of the component and the relative content of DOM,and the changes among different soils were different,the role of biochar was more obvious in acid paddy soil.The reduction efficiency of Fe (III) was promoted by adding biochar,and the initial soil pH was also impacted.The correlation analysis revealed that the addition of biochar could affect the nitrate reduction,iron reduction and methanogenesis in anaerobic paddy soils by adjusting SUVA 254,DOM composition and pH of the incubation system.

关 键 词：水稻土 生物炭 溶解性有机碳 铁还原 

分 类 号：S153.5[农业科学—土壤学]