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沼液对甘蓝连作土壤生物学性质的影响

DOI: 10.3724/SP.J.1145.2011.00384, PP. 384-387

Keywords: 沼液,甘蓝,连作,土壤微生物,土壤酶,土壤养分

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Abstract:

以施用化肥225kg/hm2为对照,设置两种不同的沼液用量(以纯氮计):沼液i(168kg/hm2)和沼液ii(225kg/hm2),通过连续3a的甘蓝种植试验,研究沼液对甘蓝连作土壤微生物区系、土壤酶活性以及土壤养分与土壤酶活性之间的相关性.结果表明:1)施用沼液显著改善了连作土壤的微生物区系,溶磷细菌、解钾细菌、氨化细菌、固氮菌和放线菌的数量显著增加;同时抑制了真菌的富集.两种不同用量的沼液处理较化肥处理的土壤细菌/真菌(b/f)值分别提高了142.7%和202.3%.2)在225kg/hm2等氮水平下,施用沼液显著提高了土壤的蔗糖酶、磷酸酶和蛋白酶活性,较之化肥处理分别提高了63.96%、137.61%和139.66%;同时显著降低了土壤过氧化氢酶和多酚氧化酶活性.3)土壤养分与土壤酶活性相关性分析表明,有机质含量与土壤脲酶、磷酸酶、蔗糖酶和蛋白酶活性呈显著正相关,与过氧化氢酶活性呈显著负相关,而与多酚氧化酶活性无明显相关性;磷酸酶活性与土壤速效磷含量呈显著正相关;蛋白酶活性与土壤碱解氮、全氮含量呈显著正相关.表4参24

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