PDF《生物质炭对紫色土耕地土壤中溶解性有机物 含量和组成特征的...》

摘要: 选取位于长江上游低山丘陵区的四川盐亭石灰性紫色土和重庆忠县中性紫色土的两种典型耕地 (旱地和菜地) 土壤, 添加 0.

5%~3.0%生物质炭并经过老化作用, 研究生物质炭添加对土壤中可水提的溶解性有机物 (DOM) 性质的影响.DOM 的含量与组分 特征分别以溶解性有机碳 (DOC) 浓度和光谱学特征参数表征.结果表明, 石灰性和中性紫色土旱地不添加生物质炭的对照土壤中 DOM 的平均含量分别为

43、

65 mg DOC ・ kg-1 , 相应菜地的对照土壤分别为

110、

105 mg DOC ・ kg-1 ;

加炭后 DOM 含量随投加量呈非单 调性变化. 石灰性和中性紫色土菜地土壤 DOM 的芳香性和腐殖化程度明显高于旱地土壤. 三维荧光光谱的平行因子分析表明, 土壤DOM 由两种土壤有机质源的类腐殖质组分及一种类色氨酸组分构成, 菜地土壤中各组分的含量都明显高于旱地土壤, 也具有更 高的芳香性和腐殖化程度.综合多种光谱学分析的结果发现, 加炭并经过老化后, 土壤 DOM 的组分特征并无明显变化. 关键词: 紫色土;

生物质炭;

溶解性有机物 (DOM) ;

三维荧光光谱;

平行因子分析 中图分类号: S153 文献标志码: A 文章编号: 1672-2043 (2017) 04-0718-09 doi:10.11654/jaes.2016-1538 Effects of biochar application on content and characteristics of dissolved organic matter in arable land of pur原ple soil LIU Hui-yun1,2 , XIAN Qing-song1,2 , LIU Chen1* , TANG Xiang-yu1 (1.Institute of Mountain Hazards and Environment, Chinese Academy of Science, Chengdu 610041, China;

2.University of Chinese Academy of Science, Beijing 100049, China) Abstract: This study characterized dissolved organic matter (DOM)in two typical arable lands of calcareous and neutral purple soil (dry land and vegetable field)that is abundantly distributed in Sichuan hilly area. Effects of biochar application (at rates of 0.5%~3.0%)on the concentration and composition of soil DOM was studied after three-months of dry-wet alternate aging process. The content and compositional characteristics of DOM were characterized by the concentration of dissolved organic carbon (DOC)and spectroscopic characteristics. Results show that concentrations of DOM extracted from calcareous and neutral purple soils are

43 and

65 mg DOC・ kg-1 for dry land, and

110 and

105 mg DOC ・ kg-1 for vegetable field, respectively. Changes in DOM contents due to biochar application vary from soils. Aromaticity and the extent of humufication of DOM in the vegetable field soils are significantly higher than the dry land soils. Two humic-like components and one tryptophan-like component are identified using fluorescence excitation-emission matrix combined with parallel factor analysis (EEMs- PARAFAC) . All of these components in vegetable field soils have higher intensities, aromaticity and humification degree than that of dry land soils. Biochar application pose no significant effects on the characteristics of soil DOM according to the results of spectroscopic analyses. Keywords: purple soil;

biochar;

dissolved organic matter (DOM) ;

fluorescence EEM;

parallel factor analysis 收稿日期: 圆园16-12-01 作者简介: 刘慧云 (1991―) , 女, 硕士研究生, 从事土壤有机污染物迁移转化行为研究.E-mail: [email protected] * 通信作者: 刘琛E-mail: [email protected] 基金项目: 国家自然科学基金项目 (41301549, 41471268) Project supported: The National Natural Science Foundation of China (4130154怨, 41471268) 圆园17,