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草业学报  2015 

不同混播方式下豆禾混播草地群落稳定性的测度与比较

DOI: 10.11686/cyxb20150316, PP. 155-167

Keywords: 豆禾混播草地,混播种类,混播比例,群落稳定性,模糊综合评价

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Abstract:

以红豆草、紫花苜蓿、红三叶、鸭茅、无芒雀麦和猫尾草6种豆禾牧草在混播种类为3、4、5、6与豆禾比5∶5、4∶6和3∶7条件下建立混播草地。依据2008-2012年各混播组合的群落组分稳定性、功能稳定性和可入侵性,比较了21个豆禾混播组合的群落稳定性。从组分稳定性来看,含红豆草的组合豆科植物稳定性较差;而不含红豆草组合豆科植物稳定性较高;从功能稳定性来看,随着混播种类数量的增加,群落稳定性呈增加趋势,豆禾比4∶6的群落稳定性低于豆禾比5∶5和3∶7。从可入侵性来看,混播种类对其影响较小,豆禾比5∶5具有较高的稳定性。通过模糊综合评价,包含组分稳定性、功能稳定性和可入侵性3个方面的群落稳定性以豆禾比为4∶6较低,而混播种类对群落稳定性影响较小。因此,混播种类与比例仅能影响到群落稳定性的某一方面,还需探寻适宜的时空尺度与评价“标尺”下影响群落稳定性的其他因素。

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