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首页> 外文期刊>Israel Journal of Plant Sciences >Species richness of annual legumes in relation to grazing in Mediterranean vegetation in northern Israel
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Species richness of annual legumes in relation to grazing in Mediterranean vegetation in northern Israel

机译：与以色列北部地中海植被放牧有关的一年生豆科植物物种丰富度

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摘要

Species richness of annual legumes in step-point transects was analyzed for 79 pairs of grazed and ungrazed sites of Mediterranean vegetation in northern Israel. Seventy-eight species of annual legumes belonging to 17 genera were sampled. Species richness of all annual legumes of Medicago and Trifolium was significantly greater, by 25-42%, on the grazed compared to the ungrazed site of site-pairs. Legume richness was significantly greater on Cretaceous and Eocene sedimentary rocks compared to younger Neogene and Pleistocene sediments, with intermediate richness on basalt. It was significantly lower in sites with 400-500 mm rainfall compared to 500-900 mm, and in wetland compared to grassland, shrubland, and woodland. Species richness of annual legumes, Medicago and Trifolium, increased significantly from zero or low grazing intensity to high intensity. A consistent, not significant reduction of species richness was observed at extremely high grazing intensity. Many species of small annual legumes increased in cover with grazing intensity. Erect or twining species did not show this response. The tendency of increased richness of annual legumes with grazing was confirmed for subhumid Mediterranean communities, but it may be reversed at extremely high grazing intensities, or in semiarid communities grazed by sheep, and for some legume taxa. Management for in situ conservation of the entire annual legume flora in productive Mediterranean vegetation requires, in different parts of the landscape, continuation of intense grazing and relative protection from grazing.
机译：分析了以色列北部地中海植被的79对放牧和非沼泽化地点的一年生豆类在阶跃点样的物种丰富度。采样属于17个属的78种一年生豆科植物。与未配对的地点对相比，放牧的所有紫花苜蓿和白三叶的一年生豆科植物的物种丰富度显着提高了25-42％。与较年轻的新近纪和更新世沉积物相比，白垩纪和始新世沉积岩中的豆科植物丰富度明显更高，而玄武岩则具有中等丰富度。在降雨量为400-500毫米的地方，与500-900毫米相比要低得多;而在湿地，与草地，灌木地和林地相比，要低得多。一年生豆科植物紫花苜蓿和白三叶的物种丰富度从零或低放牧强度显着增加到高强度。在极高的放牧强度下，观察到的物种丰富度持续而不显着降低。一年生小豆科植物的许多种类随着放牧强度的增加而增加。直立或缠绕的物种没有显示出这种反应。在半湿润的地中海社区，确认了一年生豆科植物的丰富度随放牧而增加的趋势，但在极高的放牧强度下或在绵羊放牧的半干旱社区和某些豆科植物类群中，这种趋势可能会逆转。在景观的不同部分，要对地中海地区生产性植物中的整个一年生豆科植物区系进行原地保护管理，就需要持续进行强烈放牧并提供相对的放牧保护。

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