| 吴忠东,王全九.微咸水钠吸附比对土壤理化性质和入渗特性的影响研究[J].干旱地区农业研究,2008,(1):231~236 |
| 微咸水钠吸附比对土壤理化性质和入渗特性的影响研究 |
| Study on impact of sodium adsorption ratio of saline water on soil physical and chemical properties and infiltration characteristics |
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| DOI：10.7606/j.issn.1000-7601.2008.01.43 |
| 中文关键词: 钠吸附比 累积入渗量 含水率 土壤含盐量 |
| 英文关键词:sodium adsorption ratio cumulative infiltration water content soil salt content |
| 基金项目:中国科学院知识创新工程重要方向项目(KSCX2-YW-N-003)； 中科院百人计划资助(2004109)； 高等学校博士学科点专项科研基金(20050700001) |
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| 中文摘要: |
| 目前微咸水的开发利用成为缓解淡水资源不足的一条重要途径,由于微咸水中含有各种盐分离子,会影响土壤的入渗特性,而且不同的钠吸附比对土壤的影响程度不同。为了分析钠吸附比对土壤入渗能力的影响,在河北省中科院南皮生态试验站进行了一维垂直积水入渗试验研究,在土壤初始含水率均为2.25%、入渗水的矿化度均为3 g/L时,分析不同钠吸附比的微咸水累积入渗量和湿润锋随时间的变化过程,发现二者具有相同的变化规律,用Philip模型进行分析,发现该模型对钠吸附比低于12.56(mmol/L)0.5的微咸水模拟结果较为精确。随着钠吸附比的变化,土壤剖面湿润区的水分运动接近活塞流;土壤含盐量主要受入渗水矿化度的影响,与钠吸附比关系不大。用钠吸附比较高的微咸水进行入渗,在土壤表层发生了Na+对Mg2+和Ca2+的置换作用,并导致表层土壤中钠离子的累积。 |
| 英文摘要: |
| The exploration and utilization of saline water has become a valuable approach to remit freshwater resources insufficiency.The salt ion of the saline water influences the infiltration properties of the soil,and the incidence is different by the sodium adsorption ratio of the water.In order to analyze the influence of the sodium adsorption ratio to the soil infiltration capable,one dimensional infiltration experiments in laboratory was conducted in Nanpi experimental station of Academia Sinica,when the initial soil water content was 2.25% and the mineralization degree of the infiltration water was 3 g/L,both cumulative infiltration and wetting front change event with time was analyzed when infiltrated by saline water of different SAR.It is found that both of them has similar change law,it is precisely at SAR lower than 12.56(mmol/L)0.5 when analyzed by Philip model.The water movement is approximately like piston flow at the soil profile in company with variation of sodium adsorption ratio;soil salinity principal is influenced by the degree of mineralization of infiltrated water but almost unrelated with SAR.It is observed that Mg2+ and Ca2+ are displaced by Na+ when infiltrated by saline water with higher SAR,which led to the accumulation of Na+ in the upper soil layer. |
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