不同潜水埋深下浅层土壤的水盐分布特征

发布时间：2018-04-06 22:27

本文选题：潜水水位　切入点：土壤水分　出处：《中国水土保持科学》2017年02期

【摘要】：浅层土壤水盐分布是影响植物幼苗生长的主要因子。为探讨潜水埋深对浅层土壤水盐分布特征的影响,以黄河三角洲建群种3年生柽柳苗木栽植的土壤柱体为研究对象,在咸水矿化度下(6.0 g/L),模拟设置0.3、0.6、0.9、1.2、1.5和1.8 m共6种潜水水位,测定分析不同潜水埋深下,土壤表层0~10和10~20 cm土层的土壤相对含水量、含盐量及土壤溶液绝对浓度等水盐参数。结果表明:10~20 cm土壤相对含水量高于0~10 cm,随潜水水位的增加,土壤相对含水量均显著降低,且0~10 cm土壤相对含水量随潜水水位降低幅度远高于10~20 cm,均在1.2~1.5 m处土壤相对含水量减少率最大;0~10 cm土层含盐量随潜水水位的增加,表现为先升高后降低,在1.2m潜水水位处含盐量达到最大值(1.38%),比0.3 m处增加106.35%。10~20 cm土层土壤含盐量随不同潜水水位的变化较为复杂,在潜水水位0.3~0.9 m变化平稳,在1.2 m处升高,在1.5~1.8 m降低,在1.2 m潜水水位处含盐量达到最大值(1.33%),比0.3 m处增加304.04%;0~10 cm土层土壤溶液绝对浓度随潜水水位的增加,呈指数函数增加,以1.2 m处最大(17.12%),10~20 cm土层土壤溶液绝对浓度随潜水水位的增加,先升高后降低,以1.2 m处最大(10.10%)。在0~20 cm土层土壤相对含水量与潜水水位呈显著负相关(P0.01),与土壤含盐量呈显著正相关(P0.05),土壤溶液绝对浓度在0~10 cm与潜水水位呈显著(P0.01)正相关,与土壤相对含水量呈显著(P0.01)负相关,却在10~20 cm与土壤含盐量呈显著(P0.01)正相关。该研究为黄河三角洲土壤次生盐渍化的防治及柽柳栽植管理,提供理论依据和技术参考。
[Abstract]:The distribution of water and salt in shallow soil is the main factor affecting the growth of plant seedlings.The relative water content (RWC), salt content and absolute concentration of soil solution were measured and analyzed in 0 ~ 10 and 10 ~ (20) cm soil layers under different water depth.The results showed that the relative water content of 0 ~ 10 ~ 20 cm soil was higher than that of 0 ~ 10 cm, and the relative water content of the soil decreased significantly with the increase of diving water level.The salt content reached the maximum value at 1.2m water level (1.38m), which increased 106.35cm soil layer (106.35cm) than 0.3 m soil layer (106.35cm soil layer) and varied with different phreatic water levels (0.30.9 m), increased at 1.2 m (0.30.9 m), and decreased (1.5 ~ 1.8m).At the water level of 1.2 m, the salt content reached the maximum value of 1.33%, and the absolute concentration of soil solution increased by 304.04 cm than that at 0.3 m, and the absolute concentration of soil solution increased with the increase of the water level, and the absolute concentration of soil solution increased with the increase of the water level.At 1.2 m, the absolute concentration of soil solution in 10 ~ 10 ~ 20 cm soil layer increased first and then decreased with the increase of water level, and the maximum value was 10.10 ~ 10 ~ (th) at 1.2 m.There was a significant negative correlation between soil relative water content and phreatic water level in 0 ~ 20 cm soil layer, a significant positive correlation with soil salt content, a significant positive correlation between absolute concentration of soil solution at 0 ~ 10 cm and phreatic water level (P 0.01), and a significant negative correlation with soil relative water content (P ~ (0.01)).However, there was a significant correlation between soil salt content and soil salt content at 10 ~ 20 cm (P < 0.01).This study provides theoretical basis and technical reference for soil salinization control and management of Tamarix chinensis in the Yellow River Delta.
【作者单位】：山东农业大学林学院山东省土壤侵蚀与生态修复重点实验室;滨州学院山东省黄河三角洲生态环境重点实验室;
【基金】：国家自然基金面上项目“黄河三角洲柽柳对水位-盐分变化的生理生态响应过程与机制”(31370702) 山东省重点研发计划项目“黄河三角洲盐碱地农田林网生态工程治理及配套生物修复技术研究与示范”(2015GNC111022)
【分类号】：S156.4

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