Effects of different biomass materials as a salt-isolation layer on water and salt migration in coastal saline soil

PeerJ

article

Mao Yang¹  Runya Yang²  Yanni Li¹  Yinghua Pan¹  Junna Sun¹  Zhenhua Zhang¹ 

[1] School of Resources and Environmental Engineering, Ludong University;School of Life Sciences, Ludong University

关键词: Infiltration rate;    Phreatic evaporation;    Water migration;    Salt distribution;    Salt-isolation;   

DOI  :  10.7717/peerj.11766

学科分类：社会科学、人文和艺术（综合）

来源: Inra

【 摘 要 】

The aim of this study was to find a material suited for the prevention of evaporative water loss and salt accumulation in coastal saline soils. One-dimensional vertical water infiltration and phreatic evaporation experiments were conducted using a silty loam saline soil. A 3-cm-thick layer of corn straw, biochar, and peat was buried at the soil depth of 20 cm, and a 6-cm-thick layer of peat was also buried at the same soil depth for comparison. The presence of the biochar layer increased the upper soil water content, but its ability to inhibit salt accumulation was poor, leading to a high salt concentration in the surface soil. The 3-cm-thick straw and 6-cm-thick peat layers were most effective to inhibit salt accumulation, which reduced the upper soil salt concentration by 96% and 93%, respectively. However, the straw layer strongly inhibited phreatic evaporation and resulted in low water content in the upper soil layer. Compared with the straw layer, the peat layer increased the upper soil water content. Thus, burying a 6-cm-thick peat layer in the coastal saline soil is the optimal strategy to retain water in the upper soil layer and intercept salt in the deeper soil layer.

【 授权许可】

CC BY