| 镁对土壤某些理化性质的影响 |
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| 引用本文： | 李加宏,俞仁培.镁对土壤某些理化性质的影响[J].土壤学报,1991,28(3):284-294. |
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| 作者姓名： | 李加宏 俞仁培 |
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| 作者单位： | 中国科学院南京土壤研究所, 210008;中国科学院南京土壤研究所, 210008 |
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| 摘 要： | 本文研究了镁离子在土壤中的吸附特性和交换性镁对土壤某些物理性质的影响。试验结果表明:镁盐阴离子对镁离子侵入土壤吸收复合体能力的影响为:CO32->SO42->Cl-。在低浓度下,Mg2+在Na+陪伴下较其单独存在时更易被含MgCO3的石灰性土壤吸附。在混合盐溶液中,当盐渍度和SAR一定时,Na+在Na+-Mg2+体系中比在Na+-Ca2+体系中更易被土壤吸附。当ESP一定时,随着土壤吸收复合体中交换性镁百分率(EMP)的增加,分散系数逐渐增加,饱和导水率和毛管水上升高度逐渐降低,当EMP>60%时,不再发生变化。随着ESP的增加,交换性镁的不良影响逐渐变小。
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| 关 键 词： | 镁 土壤 理化性质 |
EFFECT OF MAGNESIUM ON SOME PHYSICAL AND CHEMICAL PROPERTIES OF SOIL |
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| Li Jiahong and Yu Renpei.EFFECT OF MAGNESIUM ON SOME PHYSICAL AND CHEMICAL PROPERTIES OF SOIL[J].Acta Pedologica Sinica,1991,28(3):284-294. |
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| Authors: | Li Jiahong and Yu Renpei |
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| Institution: | Institute of Soil Science, Academia Sinica, Nanjing, 210008;Institute of Soil Science, Academia Sinica, Nanjing, 210008 |
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| Abstract: | The present paper deals mainly with the adsorption characteristics of magnesium ion in soil and the effect of exchangeable magnesium on some physical properties of soil.The experimental results Indicate that the effect of anions of magnesium salts on magnesium ion to intrude into soil absorbing complex was in the order of CO32- > SO42- > Cl-.Accompanied by sodium ion,magnesium ion was more easily adsorbed by calcaxeous soil containing magnesium carbonate than when it exists alone in soil solution with a low saliniiy Sodium ion was more easily adsorbed by soil in NaCl-MgCl2 solution than in NaCl-CaCl2 solurion when salinity and SAR were given. |
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