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草业学报  2012 

一种新的草坪草耐践踏试验方法的建立

, PP. 144-152

Keywords: 草坪草,耐践踏,践踏器

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Abstract:

为推动草坪草耐践踏机理的研究,自行设计了一款便携式草坪践踏器,提出了一套新的草坪践踏处理方法——集中践踏,从而建立了一种新的草坪草耐践踏试验方法。运用该试验方法,通过设定4个践踏处理(不践踏、轻度践踏、中度践踏和重度践踏),对多年生黑麦草进行耐践踏试验,测定了践踏后1,3,7,10,14和21d的草坪表观质量、盖度、叶绿素含量、叶片含水量和地上生物量鲜重等5项指标。结果表明,在不同的践踏强度下,多年生黑麦草的各项指标呈现出不同的变化趋势,除叶绿素含量在轻度践踏下比CK(不践踏)略微升高外,其他指标均随践踏强度的增加而明显降低。在践踏后3d及以后,所有指标均随时间的增加而呈上升趋势。轻度践踏下,各项指标在践踏后7d恢复到接近CK的水平;中度践踏下,各项指标在践踏后14d恢复到接近CK的水平,而重度践踏下,各项指标在21d内均未恢复到CK的水平。将草坪表观质量与盖度、叶绿素含量、叶片含水量和地上生物量进行了相关性分析发现,两两之间均存在高度相关性,特别是在践踏后7d及以后,其相关系数均达到了极显著水平,而且相关系数在践踏后14d达到最高。因此认为,多年生黑麦草在践踏后的14d内,可能是其生理上响应践踏胁迫的关键时期。该研究结果为进一步深入研究草坪草耐践踏机理提供了理论基础。

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