光照,施肥及刈割对垂穗披碱草生长的影响

被引:11
作者
王晓芬 [1 ]
杜国祯 [2 ]
马银山 [2 ]
张作亮 [2 ]
张世挺 [2 ]
机构
[1] 兰州大学草地农业科技学院
[2] 不详
关键词
垂穗披碱草; 施肥; 光照; 刈割; 地上生物量; 补偿;
D O I
暂无
中图分类号
S543.9 [];
学科分类号
摘要
以甘南高寒草甸常见牧草垂穗披碱草(Elymus nutans)为研究对象,比较不同光照、肥力条件下,垂穗披碱草对刈割的生长和补偿反应。研究发现,光照和肥力存在交互作用。施肥、中度光照下,未刈割单株垂穗披碱草地上生物量最大,为3.239g。施肥、中度光照下,比较刈割植株地上生物量补偿发现:晚期刈割单株地上生物量的补偿大于早期刈割;刈割强度无显著影响;刈割两次单株地上生物量的补偿最大。施肥、中度光照、晚期、轻度、一次刈割时,单株垂穗披碱草地上生物量累积最大,为4.500g。全光照、未施肥条件下,刈割对单株地上生物量的补偿无影响。就补偿机制而言,植株地上生物量的增加以地下生物量为代价。
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页码:6212 / 6218
页数:7
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