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菜地土壤磷素淋失及其影响因素

DOI: 10.3321/j.issn:1000-7091.2006.04.017, PP. 67-70

Keywords: 菜地土壤,磷素淋失,影响因素

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Abstract:

以菜地为供试土壤，研究了0~100cM菜地土壤Olsen-P、CaCl2-P、NaOH-P的空间分布状况及其相关关系。结果表明，0~20cM菜地Olsen-P、CaCl2-P、NaOH-P含量分别为：123.8~399.6mg/kg、9.1~27.2mg/kg、184.9~608.9mg/kg。土壤Olsen-P、CaCl2-P、NaOH-P主要积累在0~20cM土层，随着土壤深度的增加土壤磷的积累量逐渐降低；土壤Olsen-P与CaCl2-P、NaOH-P呈显著正相关关系。土壤Olsen-P含量高于55.6~63.0mg/kg时，土壤CaCl2-P显著增加，此时的Olsen-P含量为土壤磷渗漏淋失显著增加的“突变点”。

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