| 三峡库区土壤元素分布特征及其发生学意义 |
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| 引用本文： | 李 渝,魏朝富.三峡库区土壤元素分布特征及其发生学意义[J].中国农学通报,2007,23(12):356-356. |
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| 作者姓名： | 李 渝 魏朝富 |
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| 作者单位： | 西南大学资源与环境学院,重庆,400715 |
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| 摘 要： | 选取三峡库区万州段具有代表性母岩和土壤作为研究样点，测定了土壤和母岩中Si、Al、Fe、K、Mg、Ca、Na等几种风化成土元素的含量，探讨了土壤元素分布特征及其发生学意义。研究表明：母岩元素平均含量顺序为：Si> Al> Fe> K>Mg> Ca> Na，其中Fe、Ca、Mg、Na、K高于中国和世界元素背景值，而Al介于中国和世界元素背景值之间，Si的平均含量则低于背景值；灰岩区上的土壤中，Ca、Mg、K元素最高，砂岩母质区的土壤风化素含量较低；而碎屑岩类中，泥岩区土壤风化元素相对较高，粉砂岩区土壤风化元素含量介于泥岩与砂岩区之间；母岩的淋失强度为Ca>Mg>Al>Si>K>Fe>Na，Na元素的迁移程度小，是由于母岩中Na元素对土壤的不断补充。因此以土壤中风化元素含量为基础计算的风化指标，难以反映亚热带温暖潮湿地区的成土风化过程，常用的土壤分子硅铝率和硅铁铝率也不能指示所有土壤的风化成土作用程度，只适用于判断风化初期或成土作用早期。
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| 关 键 词： | 水稻 水稻 亲本 品质 杂种优质 配合力 |
Distribution Characteristics of Soil Elements and Its Pedogenetics in the Three Gorges Reservoir District |
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| Li Yu,Wei Chaofu.Distribution Characteristics of Soil Elements and Its Pedogenetics in the Three Gorges Reservoir District[J].Chinese Agricultural Science Bulletin,2007,23(12):356-356. |
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| Authors: | Li Yu Wei Chaofu |
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| Institution: | (College of Resources and Environment, Southwest University, Chongqing 400716) |
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| Abstract: | Taking Wanzhou as example of the Three Gorges Reservoir District, the paper studies the contents of weathering elements, such as Si, Al, Fe, K, Mg, Ca, and Na, and their distribution characteristics in parent rock and soil. The results show that the ranking of the average contents of elements is that Si>Al>Fe>K>Mg>Ca>Na. The contents of Fe、Ca、Mg、Na、K are higher than the back-ground values of soil elements of China and the world, and Al is intervenient, and Si is lower. It can be showed that the contents of Ca、Mg、K are the highest in the soil developed by limestone and are the lowest by sandstone.Among the soil developed by clastic rock, the contents of weathering elements developed by mudstone are higher than siltstone and sandstone. And it developed by siltstone is in the middle. The ranking of the leaching of parent rock is that: Ca>Mg>Al>Si>K>Fe>Na. Na is one of the lowest of them as the contents of Na in soil could be supplied by Na in parent materials. The degree of soil weathering in semi-tropical region could be not illustrated by CIA, CIW, A, B, ba, etc., calculated from the contents of weathering elements in soils. The silica-alumina molecular ratio and silica-sesquioxide molecular ratio of the fraction in soils on soil weathering are only used in at early developed soil, or at early weathering parent materials. |
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| Keywords: | The three gorges reservoir district Weathering elements Distribution characteristics The index of weathering leaching |
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