Experimental clipping of sagebrush inhibits seed germination of neighbours.
Experimental clipping of sagebrush inhibits seed germination of neighbours.
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DOI：
10.1111/j.1461-0248.2007.01068.x
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发表时间：
2007-09
期刊：
影响因子：
8.8
通讯作者：
R. Karban
中科院分区：
文献类型：
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作者：
R. Karban
目前植物群落的观点强调资源竞争和定殖能力在决定幼苗建立和植物分布方面的重要性。许多沙漠灌木被光秃秃的区域包围，这些区域缺乏其他植物，或者与周围的开阔沙漠相比，它们下面有不同的物种。有人提出，这种模式的机制是树叶挥发物、枯枝落叶沥滤物或根系分泌物等生物化学物质的释放，但这种植物毒性一直存在争议。我测试的假设，实验修剪山艾树叶增强其作为发芽抑制剂的效果。本地杂类草和草的发芽减少与修剪，与未修剪，在板条屋和田间实验的山艾树叶。蒿属植物种子没有受到明显影响。这种抑制发芽需要空气接触。不需要土壤接触和落叶，并且几乎不抑制发芽。这些结果表明，一个潜在的大，间接的，以前被忽视的作用，草食动物和发芽之间的相互作用，可能会影响植物群落结构。
Current views of plant communities emphasize the importance of competition for resources and colonization ability in determining seedling establishment and plant distributions. Many desert shrubs are surrounded by bare zones that lack other plants or have different suites of species beneath them compared with the open desert surrounding them. Releases of biochemicals as volatiles from leaves, leachates from litter, or exudates from roots have been proposed as mechanisms for this pattern, but such phytotoxicity has been controversial. I tested the hypothesis that experimental clipping of sagebrush foliage enhances its effect as a germination inhibitor. Germination of native forbs and grasses was reduced in association with clipped, compared with unclipped, sagebrush foliage in lath house and field experiments. Sagebrush seeds were not significantly affected. Air contact was required for this inhibition of germination. Soil contact and leaf litter were not required and added little inhibition of germination. These results suggest a potentially large, indirect, and previously overlooked role for interactions between herbivory and germination that could affect plant community structure.