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草业学报  2010 

蚂蚁对东祁连山高寒草地生态系统的影响

, PP. 140-145

Keywords: 蚁丘,土壤含水量,土壤容重,土壤种子库,土壤养分,高寒草地

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Abstract:

为了明晰蚂蚁对高寒草地生态系统的作用,于甘肃天祝高寒草地上研究了蚂蚁对土壤水分、容重、养分、土壤种子库和草产量的影响。结果表明,蚁丘0～10cm的土壤含水量显著低于邻近土壤,蚁丘0～10cm的土壤容重比距离蚁丘1m同等深度的容重小59％。蚂蚁具有向蚁丘土壤富集营养和种子的作用。蚁丘0～10,10～20cm深与距离蚁丘1m处土壤总种子密度和种子多样性最大的是蚁丘0～10cm,其次为蚁丘10～20cm,最小的是距离蚁丘1m处的对照。除蚁丘0～10cm深处的碱解氮略小于对照外,前者的全氮、全磷、速效钾和有机质显著高于蚁丘10～20cm和邻近土壤。蚁丘的中央部分为裸地,蚁丘外围的草产量显著低于邻近无蚁丘草地的草产量。

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