施肥和刈割对冷地早熟禾补偿生长的影响

被引：26

作者：

马银山 ^{[1
,2
]}

杜国祯 ^{[2
]}

张世挺 ^{[2
]}

机构：

[1] 河西学院生物系

[2] 兰州大学干旱与草地生态教育部重点实验室

来源：

生态学报 | 2010年 / 30卷 / 02期

关键词：

施肥; 刈割; 地上生物量; 补偿生长; 冷地早熟禾;

D O I：

暂无

中图分类号：

S812 [草地学、草原学];

学科分类号：

090503 ; 0909 ;

摘要：

以青藏高原东部高寒草甸常见牧草冷地早熟禾(Poa crymophila)为研究对象,比较研究了肥力和不同刈割处理对植物生长和生物量补偿的影响。实验采用随机设计,肥力分为施肥和不施肥,刈割处理为刈割时间、刈割频度和刈割强度3因子组合。结果表明:不刈割情况下,施肥显著促进冷地早熟禾的生长,而在刈割情况下,施肥对植物的生长没有明显的促进作用甚至有负作用。不施肥,刈割可促进冷地早熟禾地上生物量的增加并发生超补偿,但补偿程度因刈割强度、刈割频度和刈割时间而异;施肥时,刈割没有或很少促进植株发生超补偿。超补偿发生时,资源贫瘠的条件可能是必需的。冷地早熟禾发生超补偿可能是以损耗地下部分的资源为代价的,刈割刺激分蘖的增加对超补偿的发生也有一定的贡献。

引用

页码：279 / 287

页数：9

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