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为了研究塔里木沙漠公路防护林建林后土壤在咸水灌溉条件下的盐渍化状态,本文通过对塔里木沙漠公路防护林建林后沿线土壤盐分分布状况的监测,结合防护林建林前土壤盐分状况普查资料,运用统计分析、相关性分析及灰色关联分析,对防护林沿线的40个监测点的土壤盐离子、土壤盐渍化的现状及驱动力作了初步研究。研究结果表明:塔里木沙漠公路防护林建成后,土壤盐分各离子含量均较建成前有了显著增加,其中,阳离子含量Na++K+>Mg2+>Ca2+,阴离子含量Cl->CO23->SO24->HCO3-;防护林沿线土壤盐渍化类型以氯化物型与硫酸盐-氯化物型为主,分别占到监测点的84.2%与15.8%;有近81.6%的监测点已达到中度盐渍化程度;灰色关联分析结果表明,引起塔里木沙漠公路防护林土壤盐渍化的主要驱动力依次是灌溉年限、地下水矿化度,地下水pH和地下水埋深。
In order to study the salinization status of soil under salt water irrigation after the construction of Tarim Desert Highway shelterbelt, this paper analyzed the distribution of soil salinity along the Tarim Desert Highway Shelterbelt after construction, combined with the census data of soil salt status before the establishment of shelterbelts , Using statistical analysis, correlation analysis and gray correlation analysis, the status quo and driving forces of soil salinization and soil salinization in 40 monitoring sites along the shelterbelt were preliminarily studied. The results show that: After the Tarim Desert Highway Shelterbelt is completed, the ion content of soil salt increases significantly compared with that before the completion of the construction. Among them, the content of cation is Na ++ K +> Mg2 +> Ca2 +, the content of anion is Cl-> CO23-> SO24-> HCO3 -. The types of soil salinization along the shelterbelts are mainly chloride type and sulfate-chloride type, accounting for 84.2% and 15.8% of the monitoring points respectively. Nearly 81.6% of the monitoring points have reached the degree of moderate salinization The results of gray correlation analysis showed that the main driving forces of soil salinization caused Tarim desert highway shelterbelts were irrigation period, groundwater salinity, groundwater pH and groundwater depth.