渭北地区农田土壤物理性质对土壤剖面盐分的影响

发布时间：2018-03-18 14:39

本文选题：土壤物理性质　切入点：土壤盐渍化　出处：《水土保持学报》2017年04期 　论文类型：期刊论文

【摘要】：通过网格布点法对渭北地区农田土壤进行采样分析,研究了土壤团聚体、土壤容重、土壤质地对土壤剖面盐分的影响。结果表明:(1)研究区轻度盐渍化面积占46.56%,中度盐渍化占23.01%,渭北地区农田土壤盐渍化程度总体不严重但存在较大潜在风险。(2)各层土壤水稳性团聚体与含盐量呈负相关,容重与含盐量的关系因盐渍化程度不同而在各土层表现出不同的正负效应,土壤质地与含盐量仅在0—20cm土层存在显著相关性。(3)土壤物理性质对含盐量的异位影响与含盐量水平有关。当土壤含盐量1g/kg时,40—60cm容重与20—40cm含盐量为幂函数关系,且呈递增趋势;土壤含盐量在2~4g/kg时,20—40cm容重与0—20cm含盐量为一次函数关系,且呈递增趋势;当含盐量2g/kg时,0—20cm容重与20—40cm含盐量为一次函数关系,且呈递减趋势;含盐量2g/kg时,水稳性团聚体与含盐量呈显著线性负相关。
[Abstract]:Soil aggregates and bulk density were studied by sampling and analyzing farmland soil in Weibei area by grid distribution method. The effect of soil texture on the salinity of soil profile. The results show that the area of slight salinization is 46.56, moderate salinization is 23.01, soil salinization is not serious in Weibei area, but there is a great potential risk. Soil water stable aggregates were negatively correlated with salt content. The relationship between bulk density and salt content showed different positive and negative effects in different soil layers because of the different salinization degree. There was significant correlation between soil texture and salt content only in 0-20cm soil layer. (3) the heterotopic effect of soil physical properties on salt content was related to the salt content level. When the soil salt content was 1 g / kg, the bulk weight of 40 ~ 60cm and the salt content of 20-40 cm were power function, and showed an increasing trend. When the salt content of soil is 2g / kg, the bulk density of 20-40cm and the salt content of 0-20cm is a function of the first order, and it is an increasing trend; when the salt content is 2g / kg, the bulk weight of 0-20cm and the salt content of 20-40cm are primary function, and the salinity content is 2g / kg. There was a significant linear negative correlation between water stable aggregates and salt content.
【作者单位】：中国科学院教育部水土保持与生态环境研究中心;西北农林科技大学林学院;西北农林科技大学资源与环境学院;
【基金】：中国科学院重点部署项目(KJZD-EW-TZ-G10) 科技基础性工作专项(2014FY210100)
【分类号】：S156.4

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