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展开全部形成盐碱土要有两个条件：一是气候干旱和地下水位高（高于临界水位）；另一是地势低洼，没有排水出路。地下水都含有一定的盐份，如其水面接近地面，而该地区又比较干旱，由于毛细作用上升到地表的水蒸发后，便留下盐分：日积月累，土壤含盐量逐渐增加，形成盐碱土；如是洼地，且没有排水出路，则洼地水份蒸发后，即留下盐份，也形成盐碱地。盐碱影响1、土壤板结与肥力下降。2、不利于农作物吸收养分，阻碍作物生长。防治治理盐碱地的措施有水利改良措施（灌溉、排水、放淤、种稻、防渗等）；农业改良措施（平整土地、改良耕作、施客土、施肥、播种、轮作、间种套种等）；生物改良措施（种植耐盐植物和牧草、绿肥、植树造林等）；和化学改良措施（施用改良物质，如石膏、磷石膏、亚硫酸钙等）。四个方面。由于每一措施都有一定的适用范围和条件，因此必须因地制宜，综合治理。',getTip:function(t,e){return t.renderTip(e.getAttribute(t.triangularSign),e.getAttribute("jubao"))},getILeft:function(t,e){return t.left+e.offsetWidth/2-e.tip.offsetWidth/2},getSHtml:function(t,e,n){return t.tpl.replace(/\{\{#href\}\}/g,e).replace(/\{\{#jubao\}\}/g,n)}},baobiao:{triangularSign:"data-baobiao",tpl:'{{#baobiao_text}}',getTip:function(t,e){return t.renderTip(e.getAttribute(t.triangularSign))},getILeft:function(t,e){return t.left-21},getSHtml:function(t,e,n){return t.tpl.replace(/\{\{#baobiao_text\}\}/g,e)}}};function l(t){return this.type=t.type
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0:-1;if(n!==r)for(var i=0;i0&&function(t,e,n,r){var i=document.getElementsByClassName(t);if(i.length>0)for(var o=0;o展开全部介绍下在平原地带土壤盐碱化的原因至于高原地带有待高手回答在形成过程中河流水体中有大量的盐分存留在了平原成土母质和地下水的水体中，加之成土母质颗粒细密，造成地下水排水不畅且埋深浅，在蒸发作用下，地下浅层水经毛细管输送到地表被蒸发掉，毛细管向地表输水的过程中，也把水中的盐分带到地表，水被蒸发后，盐分就留在了地表及地面浅层土壤中，这样积累的盐分多了，又没有足够的淡水稀释并将其排走，就形成了土壤盐碱化。
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展开全部土壤盐碱化的原因和治理措施如下：原因是气候因素，土壤盐碱化过程是易溶性盐分在土壤表层逐步积累的过程，地表蒸发、入渗过程是盐分在土体中迁移运动的重要驱动力，直接控制着盐分在土体中分布、存在状态。地形和地貌因素，地形和地貌直接影响地表水和地下水的径流。地表水和地下水径流途中，溶解了上壤和地层中盐分，加之蒸发浓缩，溶解性总固体不断增高。因此，土壤盐渍化程度表现为随地形从高到低、从上游到下游逐渐加剧的趋势。治理措施有化学改良措施是通过施用化学改良剂及矿质化肥改良盐渍土的方法，常用的化学改良剂有有机或无机肥料、矿质化肥、亚硫酸钙、脱硫石膏、磷石膏、硫酸亚铁、高聚物改良剂及土壤综合改良剂等。生物改良措施，植物地上生长部分具有遮蔽作用，能够降低土壤水分蒸发，减弱地表积盐速度植物吸收盐分能降低土壤盐含量植物根系穿插土壤中能改变土壤物理性质。土壤盐碱化土壤盐碱化是指土壤底层或地下水的盐分随毛管水上升到地表，水分蒸发后，使盐分积累在表层土壤中的过程。是指易溶性盐分在土壤表层积累的现象或过程。以上内容参考：搜狗问问-高中地理 土地盐碱化形成的原因及措施有哪些',getTip:function(t,e){return t.renderTip(e.getAttribute(t.triangularSign),e.getAttribute("jubao"))},getILeft:function(t,e){return t.left+e.offsetWidth/2-e.tip.offsetWidth/2},getSHtml:function(t,e,n){return t.tpl.replace(/\{\{#href\}\}/g,e).replace(/\{\{#jubao\}\}/g,n)}},baobiao:{triangularSign:"data-baobiao",tpl:'{{#baobiao_text}}',getTip:function(t,e){return t.renderTip(e.getAttribute(t.triangularSign))},getILeft:function(t,e){return t.left-21},getSHtml:function(t,e,n){return t.tpl.replace(/\{\{#baobiao_text\}\}/g,e)}}};function l(t){return this.type=t.type
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