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低磷石灰性土壤加入四种作物秸秆土壤微生物量磷的变化特征

DOI: 10.7668/hbnxb.2010.03.042, PP. 200-204

Keywords: 作物秸秆,土壤微生物量磷,土壤微生物量碳磷比,土壤有效磷

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Abstract:

土壤微生物量磷变异很大,受多种因素的影响。采用室内培养试验的方法(25℃,培养90d),研究有效磷含量比较低的石灰性土壤,加入小麦、玉米、大豆和棉花秸秆四种不同作物对土壤微生物量磷及其碳磷比的影响。结果表明:在氮素充足的条件下,土壤和秸秆磷素状况对土壤微生物量碳影响比较小,但显著地影响土壤微生物量磷,随碳源物质磷素含量和土壤有效磷含量的提高,土壤微生物量磷增加,微生物量碳磷比降低。在土壤有效磷含量比较低的条件下,土壤微生物磷素营养主要受制于秸秆含磷量及其分解进程,反之,土壤微生物磷素营养受秸秆的影响则比较小。

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