宝鸡城郊农田土壤水溶性有机碳含量分布及紫外-可见光谱特征分析  

Distribution of Soil Dissolved Organic Carbon in Farmland of Baoji Suburb and Analysis of Its Ultraviolet-Visible Spectral Characteristics

作　　者：李美娟 LI Mei-juan(Key Laboratory of Disaster Monitoring and Mechanism Simulation of Shaanxi Province, Baoji 721013, China College of Geographic ＆ Environment, Baoji University of Arts and Science, Baoji 721013, China)

机构地区：[1]陕西省灾害监测与机理模拟省级重点实验室,陕西宝鸡721013 [2]宝鸡文理学院地理与环境学院,陕西宝鸡721013

出　　处：《江西农业学报》2017年第11期33-37,共5页Acta Agriculturae Jiangxi

基　　金：陕西省教育厅专项科学研究项目(16JK1042);陕西省教育厅项目(14JS008);陕西省科技计划项目自然科学基础研究计划(2015JQ4114)

摘　　要：测定了宝鸡市城郊麦田和油菜田土壤的水溶性有机碳含量,分析了它们的紫外-可见光谱特征。研究结果表明:油菜田土壤水溶性有机碳含量明显高于麦田土壤的;麦田和油菜田土壤水溶性有机碳含量分别在20~30 cm、10~20 cm土层中最高,但均在30~50 cm土层中最低;随着土层深度在0~50 cm间增加,两种农田土壤的p H值均增大;在190~800 nm波长区间,随着波长增加,两种农田土壤样品水溶性有机碳的吸光度均降低,最大吸收峰出现在200 nm左右,而且在240~280 nm波长区间存在明显的肩峰吸收。The contents of soil dissolved organic carbon in wheat field and oilseed rape field of Baoji suburb were determined,and their ultraviolet-visible spectral characteristics were analyzed. The results showed that： the content of soil dissolved organic carbon in oilseed rape field was obviously higher than that in wheat field; the content of dissolved organic carbon in wheat field and oilseed rape field was the highest in 20 ~ 30-cm-deep and 10 ~ 20-cm-deep soil layer,respectively,while the content of dissolved organic carbon was the lowest in 30 ~ 50-cm-deep soil layer of both wheat field and oilseed rape field; the soil p Hvalue of two types of farmlands increased with the increase in soil layer depth within 0 ~ 50 cm; as the wavelength increased from190 nm to 800 nm,the absorbance of dissolved organic carbon in soil samples of both wheat field and oilseed rape field decreased,the maximum absorption peak appeared at about 200 nm,and an apparent acromion-absorption existed within 240 ~280 nm.

关 键 词：农田 土壤 水溶性有机碳 分布 紫外-可见光谱 特征 

分 类 号：S153.62[农业科学—土壤学]