中国土壤系统分类中盐成土及其相关土壤诊断标准的修订建议
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国家科技基础性工作专项(2008FY110600)和国家自然科学基金项目(41171185)资助


Suggested revisions of diagnostic criteria for Halosols and relevant soils in Chinese Soil Taxonomy
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    摘要:

    盐土在表层土壤和根系活动区有易溶盐的累积,这是由于含盐地下水通过毛管到达地表水分蒸发后在地表累积造成的。通过比较分析《中国土壤系统分类》、《世界土壤参比基础》、《美国土壤系统分类》中关于盐土诊断标准的异同,以及搜集他人文献,得到了一些在改良后土壤盐分含量及其在剖面中分布发生了变化的一些土壤数据。研究结果表明,随着长期的灌溉,盐分淋洗下移,盐积层下移,有些已经不符合《中国土壤系统分类》中的正常盐土的标准,有些也不符合《世界土壤参比基础》中的盐土标准,但大都符合《美国土壤系统分类》的盐化干旱土标准。根据这一研究结果,我们建议采取《美国土壤系统分类》的盐土划分标准,以便将灌溉改良的盐土依然保留在盐土分类单元中,使土壤分类不会因为人为的一些扰动而改变。

    Abstract:

    The criteria for classifying soil as saline taxon are different in different soil classification systems. Soils are named as saline soil in Chinese Soil Taxonomy, World Reference Base for the Soil Resources and US Soil Taxonomy, respectively, when soil has a salic horizon starting within 30 cm, within 50 cm and within 100 cm from the soil surface. This paper describes some soil profiles that were classified into saline taxon in CST, WRB and ST before they are reclaimed, to see if these soils after a long history of irrigation are still classified into saline taxon in the three soil classification systems. The results show that the salts were leached into certain depth, the salic horizons were observed at different depth from the surface, many profiles could not be classified as Orthic Halosols as identified earlier, some of them could not be classified as Solonchaks, few of them even could not be classified as Salids. The depth of salic horizon is related to the amount of irrigation water and irrigation models. According to the present study, we suggest that the criteria of ST should be taken for keeping reclaimed saline soils in the saline taxon, i.e. Soil classification should not be changed by irrigation.

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张凤荣,王秀丽,王 数,郑 重,吴 昊.中国土壤系统分类中盐成土及其相关土壤诊断标准的修订建议[J].土壤学报,2013,50(2):419-422. DOI:10.11766/trxb201204250151 Zhang Fengrong, Wang Xiuli, Wang Shu, Zheng Zhong, Wu Hao. Suggested revisions of diagnostic criteria for Halosols and relevant soils in Chinese Soil Taxonomy[J]. Acta Pedologica Sinica,2013,50(2):419-422.

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  • 收稿日期:2012-04-25
  • 最后修改日期:2012-07-04
  • 录用日期:2012-08-24
  • 在线发布日期: 2012-12-24
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