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草业科学  2013 

长期刈牧利用下贵州高原黑麦草╋白三叶草地养分和植被构成变化

, PP. 1575-1583

Keywords: 贵州高原,刈牧,黑麦草+白三叶草地,矿质成分,牧草养分,植被构成

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Abstract:

？对贵州高原长期割草(M)、割草+放牧(M+G)、连续放牧(CG)和轮牧休闲(RG)4种利用方式下,黑麦草(Loliumperenne)+白三叶(Trifoliumrepens)草地土壤和牧草养分及植被构成进行系统分析,为该类草地的持续利用提供实践依据。结果表明,土壤养分含量变化复杂,CG草地土壤酸化严重,M草地牧草Ca含量和RG草地牧草P含量较高,CG草地牧草Mg含量较低,M和M+G草地牧草Cu含量较高,牧草营养价值在4种利用方式间无显著差异。黑麦草分蘖密度为RG>M+G>M=CG,分蘖质量为M=M+G>CG=RG;白三叶匍匐茎密度和匍匐茎质量为M=RG>M+G=CG。植物物种数为CG>M=M+G>RG。CG草地群落结构复杂,主要由黑穗画眉草(Eragrostispilosa)构成,M草地主要由白三叶+蒲公英(Taraxacumofficinale)+白苞蒿(Artemisialactiflora)构成,M+G和RG草地群落结构简单,仍主要由播种黑麦草+白三叶构成。割草+放牧(M+G)和轮牧休闲(RG)为研究区黑麦草+白三叶草地长期利用的较适宜方式。

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