内蒙古河套灌区紧邻排干沟土壤盐渍化与肥力特征分析
收稿日期: 2020-06-28
修回日期: 2020-08-30
网络出版日期: 2021-03-05
基金资助
内蒙古自治区科技重大专项(zdzx2018059);国家自然科学基金项目(51839006);国家自然科学基金项目(51769021)
Characteristics of salinization and fertility of saline-alkali soil adjacent to drainage ditch in Hetao irrigation area of Inner Mongolia
Received date: 2020-06-28
Revised date: 2020-08-30
Online published: 2021-03-05
合理改良河套灌区紧邻排干沟盐碱地,能够有效促进灌区盐碱地生态修复与农业可持续发展。结合描述性统计与主成分分析的方法,对河套灌区乌拉特灌域紧邻排干沟土壤盐碱化与肥力特征进行了分析。结果表明：（1） 研究区土壤属于重度氯化物型盐化土;Mg2+为土壤盐化程度高的关键阳离子,Mg2+含量过高减缓了Na+的吸收速度,加剧了土壤碱化进程。（2） 0~40 cm土层土壤碱化度在13.0%~28.6%之间,土壤碱化度高的原因包括两个方面：一方面是由于CaCO3不能阻止土壤吸附Na+,另一方面是因为土壤中Mg2+不能促进Na+吸附;土壤pH与碱化度、总碱度均存在正相关关系。（3） 主成分分析结果表明,研究区可将土壤含盐量、Cl-、Ca2+、Mg2+、pH、总碱度和碱化度作为土壤盐渍化的主要特征因子。（4） 研究区土壤钾素含量偏高,其他营养元素含量偏低。紧邻排干沟的土壤属于氯化物盐化土与碱化土复合型盐碱地,导致土壤具有土粒分散、湿时泥泞、不透气、不透水、干时硬结、耕性极差的特点;同时土壤养分偏低,应大量补充除钾素以外的其他土壤营养元素。该研究对于分析河套灌区紧邻排干沟盐碱土、制定合理土地利用政策与生态改良措施和实现区域可持续发展等方面具有重要作用。
周利颖,李瑞平,苗庆丰,窦旭,田峰,于丹丹,孙晨云 . 内蒙古河套灌区紧邻排干沟土壤盐渍化与肥力特征分析[J]. 干旱区研究, 2021 , 38(1) : 114 -122 . DOI: 10.13866/j.azr.2021.01.13
Reasonable improvement of saline-alkali soil in Hetao irrigation area adjacent to drainage ditch irrigation area can effectively promote ecological restoration and sustainable agricultural development. We analyzed saline-alkali soil’s salinization and fertility characteristics adjacent to drainage ditch irrigation area in Urad Front Banner with descriptive statistical analysis and principal component analysis. The soil in the study area has heavy chloride saline, with Mg2+ being the key cation of soil salinization. The excessive content slows down the absorption rate and increase soil’s alkalization rate. Soil’s alkalinity in 0-40 cm depth ranged from 13.0%-28.6%. The alkalinity degree we observed was caused because calcium carbonate could not prevent the soil from absorbing sodium ions. On the other hand, Mg2+ in soil could not promote Na+ adsorption, and there was a function correlation between soil’s pH, alkalinity, and total alkalinity. The principal component analysis results showed that the soil salinity, Cl-, Ca2+, Mg2+, pH, total alkalinity, and alkalinity were the main factors of soil salinization. The soil in the study area was potassium-rich, whereas other fertility levels were low. The soil adjacent to the drainage ditch belongs to compound saline-alkali chloride soil and alkaline soil. Such soils are hard to cultivate because of particle dispersion, muddy, impermeable characteristics, and low fertility, requiring soil enrichment with fertility elements other than potassium. Our study contributes significantly for analyzing the saline-alkali soil in the Hetao irrigation area, allowing rational land use policy and ecological improvement measures to be taken and incentivizing regional sustainable development.
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