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草业科学  2014 

东非狼尾草入侵对冷季型草坪土壤呼吸及草坪质量的影响

DOI: 10.11829\j.issn.1001-0629.2013-0297, PP. 393-398

Keywords: 东非狼尾草,土壤呼吸,叶绿素含量,地上生物量,草坪品质

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Abstract:

?试验以草地早熟禾(Poapretensis)、多年生黑麦草(Loliumperenne)和高羊茅(Festucaarundinacea)冷季型混播草坪为对象,研究了东非狼尾草(Pennisetumclandestinum)入侵后,土壤呼吸速率、草坪品质及地上生物量等方面的变化。结果表明,东非狼尾草入侵降低了混播草坪白天土壤呼吸速率、土壤温度及土壤含水量,改变了白天土壤呼吸曲线,但对最大呼吸强度(3.68μmol·m-2·s-1)没有显著影响。相关性分析表明,混播草坪的土壤呼吸速率与温度呈显著正相关,与土壤含水量呈负相关,不过土壤呼吸速率与温度的相关性因东非狼尾草入侵发生了改变。另外,东非狼尾草入侵后,地上生物量显著提高(P<0.05),相反,叶片叶绿素含量显著降低(P<0.05)。根据9分制评定结果,东非狼尾草入侵后,草坪颜色、草坪质地和草坪均匀性均有降低,导致草坪品质变劣。

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