滨海黏质盐渍土饱和泥浆与不同土水比土壤浸提液电导率的响应关系分析  

Response Relationship Analysis of Electrical Conductivity between Saturated Mud and Soil Leaching Liquor with Different Soil⁃Water Ratios in Coastal Clay Saline Soil Area

作　　者：王璐[1,2,3,4] 胡鑫慧 张岸清 郭洪海 郭徽[4] 刘振林 贾曦 Wang Lu;Hu Xinhui;Zhang Anqing;Guo Honghai;Guo Hui;Liu Zhenlin;Jia Xi(Shandong Academy of Agricultural Sciences,Jinan 250100,China;Institute of Modern Agriculture in Yellow River Delta,Shandong Academy of Agricultural Sciences,Dongying 257091,China;Key Laboratory of Biological Resources and Evaluation and Utilization in Saline-Alkali Land,Ministry of Agriculture and Rural Affairs,Dongying 257091,China;Dongying Research Center of Modern Agriculture in Yellow River Delta,Dongying 257091,China;Technical Innovation Center for Comprehensive Utilization of Saline-Alkali Land,Dongying 257091,China)

机构地区：[1]山东省农业科学院,山东济南250100 [2]山东省农业科学院黄河三角洲现代农业研究院,山东东营257091 [3]农业农村部盐碱地生物资源与评价利用重点实验室,山东东营257091 [4]东营黄河三角洲现代农业研究中心,山东东营257091 [5]盐碱地综合利用技术创新中心,山东东营257091

出　　处：《山东农业科学》2024年第6期152-158,共7页Shandong Agricultural Sciences

基　　金：国家重点研发计划项目(2021YFD1900902);山东省重点研发项目(2020CXGC010804);山东省农业科学院农业科技创新工程项目(CXGC2022A18);黄三角国家农高区省级科技创新发展专项资金项目(2022SZX43)。

摘　　要：为统一和精准判定耐盐作物种植地块的土壤盐渍化程度,并针对饱和泥浆制备时饱和点的不确定性及其电导率测定的不稳定性等问题,本试验采用室内化验与统计分析方法,系统研究饱和泥浆与饱和土壤溶液两者间含水量和电导率的响应关系,以及饱和泥浆电导率、全盐含量与土水比1∶0.5、1∶1、1∶2.5、1∶3.5、1∶5土壤浸提液电导率与全盐含量的响应和换算关系。结果表明:在滨海黏质盐渍土区,利用计算田间土壤孔隙度得到的饱和土壤溶液含水量、电导率不能直接代替饱和泥浆含水量、电导率,尽管二者的响应关系达到极显著水平;饱和泥浆电导率、全盐含量分别与土水比1∶1和1∶0.5土壤浸提液的数值差异最小,且与土水比1∶0.5~1∶5间各处理土壤浸提液的相应指标均呈极显著的响应关系;饱和泥浆电导率与土水比1∶5土壤浸提液的电导率、饱和泥浆全盐含量与土水比1∶1土壤浸提液全盐含量相关性最高,可分别用最佳拟合线性模型进行换算,模型分别为ECe(mS/cm)=5.406EC1∶5-0.284 4,TSe(g/kg)=0.836 4TS1∶1-0.135 9。Aiming at the determination of soil salinization degree in the fields planting salt⁃tolerant crops uniformly and accurately,and the problems of uncertainty of saturation point during preparing saturated mud and instability of measuring its electrical conductivity,the response relationships of water content and electrical conductivity between saturated mud and soil leaching liquor were studied by laboratory tests and statistical a⁃nalysis.The response and conversion relationships of electrical conductivity and total salt content between satu⁃rated mud and soil leaching liquor with soil⁃water ratios of 1∶0.5、1∶1、1∶2.5、1∶3.5 and 1∶5.The results showed that in the coastal saline soil area,the water content,electrical(conductivity)of soil leaching liquor obtained by calculating soil porosity in field could not directly replace that of saturated mud,although their re⁃sponse relationship had reached the very significant level.The differences in electrical conductivity and total salt content between saturated mud and soil leaching liquor with soil⁃water ratio at 1∶1 and 1∶0.5 were the least,and there were very significant response relationships with the corresponding parameters of soil leaching liquor with soil⁃water ratio from 1∶0.5 to 1∶5.The correlation in electrical conductivity between saturated mud and soil leaching liquor with soil⁃water ratio at 1∶5 and that in total salt content of saturated mud and soil leac⁃hing liquor with soil⁃water ratio at 1∶1 were both the highest,and they could be converted by the best⁃fit linear models,which were ECe(mS/cm)=5.406EC1∶5-0.2844 and TSe(g/kg)=0.8364TS1∶1-0.1359,respec⁃tively.

关 键 词：黏质盐渍土 土水比 饱和泥浆 土壤浸提液 电导率 全盐含量 

分 类 号：S156.42[农业科学—土壤学]