摘要
【目的】研究滴灌条件下在中、重度盐碱地作物行间裸地覆盖不同厚度的高分子多孔隙涤纶(PET)无纺布对土壤水盐运移的影响,以期为无纺布的应用和土壤盐渍化的防治提供方法参考。【方法】在盐碱地作物行间裸地覆盖不同厚度的涤纶无纺布,对比分析各种处理对土壤水分、盐分及Na+含量的影响。【结果】(1)与无覆盖措施相比,涤纶无纺布覆盖处理下中、中度盐碱条件下土壤含水率分别提高11.2%和12.54%,以PET3的保水效果最好;(2)各处理均能不同程度地降低土壤盐分及Na+含量,以0~20 cm土层效果显著,各处理的脱盐效果依次为:PET3>PET2>PET1>CK,以PET3在重度盐碱地的脱盐率最高,为57.04%。(3)无纺布覆盖重度盐碱地的脱盐率高于中度盐碱地。【结论】无纺布覆盖能够减少水分蒸发、降低表层土壤与深层土壤之间的水势梯度,抑制土壤返盐;无纺布的脱盐效果与土壤的本底含盐量有关,本底含盐量越高其脱盐效果越显著;无纺布的克重越大,保水性能就会增加,覆盖下土壤水分和盐分的运移密切相关,保水性能佳的材料其抑盐、脱盐效果也较好。
【Objective】The purpose of this study was to study the effect of high-molecular-weight polyporous polyester(PET)non-woven fab-rics with different thicknesses on the medium and severe saline-alkali land crops barely covered by drip irrigation on soil water and salt trans-port.It provides reference for methods of soil salinity control.【Method】Bare fields of saline-alkali crops were covered with polyester non-woven fabrics of different thicknesses and the effects of various treatments on soil moisture,salt,and Na+content were compared and ana-lyzed.【Result】(i)Compared with non-covering measures,the moisture content of soil under polyester and non-woven fabrics was increased by 11.2%and 12.54%under medium and moderate saline-alkali conditions,and PET3 had the best water retention effect;(ii)Each treatment could reduce soil salinity and Na+content to varying degrees.The effect of 0-20 cm soil layer was significant.The desalination effect of each treatment was:PET3>PET2>PET1>CK.The desalination rate of PET3 in severe saline-alkali land was 57.04%which was the highest among all treatments.(iii)The desalination rate of non-woven fabrics covering heavy saline-alkali land was higher than that of moderate saline-alkali land.【Conclusion】Non-woven fabric cover can reduce water evaporation,reduce water potential gradient between top soil and deep soil,and inhibit soil salt return.The desalination effect of non-woven fabric is related to the background salt content of the soil.The higher the desalination effect,the more significant;the greater the weight of the non-woven fabric,the water retention performance will increase.The soil moisture and salt movement under the cover are closely related.
作者
王亚娟
唐鹏飞
张凤华
董丽松
杨慧丽
WANG Ya-juan;TANG Peng-fei;ZHANG Feng-hua;DONG Li-song;YANG Hui-li(College of Agronomy,Shihezi University,Xinjiang Shihezi 832003,China;Xinjiang Production and Construction Group Key Labora-tory of Oasis Eco-agriculture,Xinjiang Shihezi 832003,China;Changchun Institute of Applied Chemistry,Chinese Academy of Agricul-tural Sciences,Jilin Changchun 130000,China)
出处
《西南农业学报》
CSCD
北大核心
2021年第1期151-158,共8页
Southwest China Journal of Agricultural Sciences
基金
国家重点研发计划课题(2016YFC0501406)。
关键词
无纺布
盐碱地
水盐运移
脱盐效果
Non-woven fabric
Saline-alkali soil
Water and salt transport
Desalination effect
