| 奇台县绿洲农田土壤盐渍化影响因素及逆向演替特征研究 |
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| 引用本文： | 韩茜,熊黑钢.奇台县绿洲农田土壤盐渍化影响因素及逆向演替特征研究[J].干旱区资源与环境,2009(7). |
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| 作者姓名： | 韩茜 熊黑钢 |
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| 作者单位： | 新疆维吾尔自治区发展改革委经济研究院;新疆大学资源与环境科学学院;北京联合大学应用文理学院; |
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| 基金项目： | 国家自然科学基金(40771194)项目资助 |
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| 摘 要： | 在奇台县绿洲中部平原区和绿洲沙漠交错带选择不同耕种时间的农田,分析其剖面土壤可溶性总盐、pH值含量随耕种时间的变化。探讨在地下水埋深不断下降的过程中,不同发展阶段农田土壤盐渍化的时空变化规律。研究表明:奇台县绿洲地下水埋深已低于影响地表盐渍化的地下水埋深临界值(5m),地下水矿化度低于3g/L,研究区整体处于有利于土壤盐渍化逆向演替的环境。土壤含盐量与地下水埋深关系最为密切,地下水埋深在3-5m时,土壤脱盐速度最快,大于5m时,含盐量减少的速率明显降低。土壤盐渍化逆向演替具有时空特征。时间特征表现在,无论农田在绿洲的什么位置,耕种时间越长,土壤含盐量越低,盐渍化逆向发展的越好。当农田耕种时间和地下水埋深低于临界值的时间超过20年时,盐渍土基本可以自然恢复为非盐渍土。空间特征表现在,由绿洲下部向上部,土壤盐渍化逆向演替阶段逐渐向高级过渡。
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| 关 键 词： | 土壤盐渍化 逆向演替 奇台县绿洲 |
Study on influence factors and characters of reversal evolvement of farmland soil salinization in Qitai oasis |
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| HAN Qian,XIONG Heigang.Study on influence factors and characters of reversal evolvement of farmland soil salinization in Qitai oasis[J].Journal of Arid Land Resources and Environment,2009(7). |
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| Authors: | HAN Qian XIONG Heigang |
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| Institution: | 1.Institute of Economic Research;Xinjiang Uygur Autonomous Region Development and Reform Commission;Urumqi830002;P.R.China;2.College of Resources & Environment Science;Xinjiang University;Urumqi830046;3.College of Art & Science;Beijing Union University;Beijing100083;P.R.China |
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| Abstract: | Choosing farmlands of different cultivated time in plain and oasis-desert ecotone in Qitai oasis to analyze the movement of soil soluble total salt and pH value.With the decline of groundwater table,the temporal and spatial changes of farmlands soil-salinization in different phases were discussed.The results showed that Qitai oasis has already in a circumstance which is valuable for soil-salinization reversal evolvement.Groundwater table is below 5 meters,the critical point could affect the surface salt acc... |
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| Keywords: | soil-salinization reversal evolvement Qitai oasis |
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