...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Oikos: A Journal of Ecology >Temporal dynamics of herbivory and water availability interactively modulate the outcome of a grass-shrub interaction in a semi-arid ecosystem
【24h】

Temporal dynamics of herbivory and water availability interactively modulate the outcome of a grass-shrub interaction in a semi-arid ecosystem

机译：在半干旱生态系统中，草食和水分供应的时间动态交互地调节草丛相互作用的结果

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

The study of plant-plant interactions along grazing and abiotic stress gradients is a major research topic in plant ecology, but the joint effects of both stressors on the outcome of plant-plant interactions remains poorly understood. We used two different factorial experiments conducted in a semi-arid Mediterranean steppe to assess: 1) the role of the perennial grass Stipa tenacissima, a low-palatability species, providing protection from rabbit herbivory to the shrub Retama sphaerocarpa (experiment 1), and 2) the effects of environmental amelioration provided by Stipa on the recovery of Retama after rabbit damage under two contrasted levels of water availability (experiment 2). In the experiment 1, water stress worked as an indirect modulator of herbivore protection by Stipa. This species protected Retama seedlings from rabbit herbivory during the wetter conditions of spring and winter, but this effect dissapeared when rabbit pressure on Retama increased during summer drought due to the decrease in alternative food resources. In the experiment 2, Stipa exerted a negative effect on the survival of Retama seedlings during the three years of the experiment, regardless of inter-annual differences in rainfall or the watering level applied. This negative effect was mainly due to excessive shading. However, Stipa increased Retama recovery after initial rabbit impact, overriding in part this negative shade effect. Conversely, Stipa impact on the Fv/Fm of Retama seedlings depended on the intra-annual water dynamics and its experimental manipulation, overall contradicting predictions from the stress-gradient hypothesis. The complex interactions found between herbivory, microclimatic amelioration from Stipa, and water availability as drivers of Retama performance illustrate the importance of considering the temporal dynamics of both biotic and abiotic stressors to fully understand the outcome of plant-plant interactions.
机译：沿着放牧和非生物胁迫梯度进行植物-植物相互作用的研究是植物生态学中的一个主要研究课题，但是两种应激源对植物-植物相互作用结果的共同影响仍然知之甚少。我们在半干旱的地中海草原上使用了两个不同的阶乘实验来评估：1）多年生草针茅草（Stipa tenacissima）的作用，这种草适口性较低，可保护兔子免受草食性灌木雷塔玛草（试验1）的侵害，并且2）在两种相反的水利用率水平下，Stipa提供的环境改善措施对兔破坏后Retama的恢复产生影响（实验2）。在实验1中，水分胁迫是Stipa保护草食动物的间接调节剂。该物种在春季和冬季的湿润条件下保护了Retama幼苗免受草食动物的侵害，但是当夏季干旱中由于其他食物资源减少，兔子对Retama的压力增加时，这种作用消失了。在实验2中，不管降雨或施水水平的年际差异如何，针茅对实验中的Retama幼苗的存活均产生负面影响。这种负面影响主要是由于过度的阴影。然而，最初的兔子撞击后，针叶树提高了Retama的恢复，部分抵消了这种负面的阴影效果。相反，针茅对Retama幼苗Fv / Fm的影响取决于年内水动力学及其实验操作，总体上与应力梯度假说的预测相矛盾。食草，针茅的微气候改善和Retama表现的驱动力水源之间发现了复杂的相互作用，这说明考虑生物和非生物胁迫源的时间动态以充分理解植物与植物相互作用的结果的重要性。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号