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昆明市耕地土壤的有效硫及其与次生盐化的相关性

Available Sulfur of Cultivated Soil in Kunming and Its Correlation with Secondary Salinization
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摘要 为昆明市及类似地区农业生产施肥与耕地土壤质量保护提出技术支撑,采用磷酸盐-乙酸提取-硫酸钡比浊法等方法测定耕地土壤有效硫和水溶性盐等土壤理化性质,并统计分析有效硫含量及其与次生盐化的相关性。结果表明:昆明市的9个县(市、区)土壤有效硫含量偏高,平均为114mg/kg;蔬菜与花卉主产区和传统种植区的晋宁、官渡和嵩明等区域由于设施栽培面积较大,化肥施用量较高,水溶性盐含量较高,平均大于1.70g/kg;土壤水溶性盐总量与有效硫含量的线性相关方程为y=0.0083x+0.6708,R^2=0.7959,二者呈极显著相关。蔬菜与花卉的主产区和传统种植区水溶性盐含量较高,土壤有效硫含量是引起土壤次生盐化的重要因素。 In order to provide technical support for agricultural production and fertilization,and soil quality protection in Kunming and similar areas,phosphate-acetic acid extraction-barium sulfate turbidimetric method was used to determine the physical and chemical properties of cultivated soil,such as available sulfur and water-soluble salt. Afterwards,the content of available sulfur and its correlation with secondary salinization were statistically analyzed. Results: The soil available sulfur content in nine counties (cities and districts) of Kunming was at a high level,with an average of 114 mg/kg;Due to the large protected cultivation area,high application rate of chemical fertilizer and high content of water-soluble salt,the average content of water-soluble salt was more than 1.70 g/kg in Jinning,Guandu and Songming,where were the main producing areas of vegetables,flowers and traditional growing areas. The linear correlation equation between the total amount of water-soluble salts and the content of available sulfur in soil was y=0.008 3x+0.670 8,R^2 =0.795 9,which showed a very significant correlation between the total amount of water-soluble salts and the content of available sulfur. The content of water-soluble salt in the main producing areas and traditional planting areas of vegetables and flowers is relatively high,and the content of available sulfur in soil is an important factor leading to soil secondary salinization.
作者 谭海燕 周文星 钱玲 梁志妹 童江云 TAN Haiyan;ZHOU Wenxing;QIAN Ling;LIANG Zhimei;TONG Jiangyun(Resources and Environment Research Institute,Kunming Academy of Agricultural Sciences,Kunming,Yunnan 650118,China)
出处 《贵州农业科学》 CAS 2019年第10期39-42,共4页 Guizhou Agricultural Sciences
基金 农业部测土配方施肥补贴项目“耕地质量提升和化肥减量增效研究”(2016-2018).
关键词 耕地土壤 有效硫 水溶性盐 次生盐化 昆明 云南 cultivatcd soil available sulfur soluble salts secondary salinization Kunming Yunnan
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