...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Plant and Soil >Effects of grazing management system on plant community structure and functioning in a semiarid steppe: scaling from species to community
【24h】

Effects of grazing management system on plant community structure and functioning in a semiarid steppe: scaling from species to community

机译：放牧管理系统对半干旱草原植物群落结构和功能的影响：从物种到群落的扩展

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

Under the aim of searching for a more sustainable grazing management system, a mixed management system (grazing and haymaking alternate annually) was proposed and tested against traditional management system (used consistently either for grazing or haymaking) in the semiarid grassland of Inner Mongolia with a field manipulation experiment. The responses of aboveground biomass to the two grazing management systems were examined across different levels of organization (i.e., species, plant functional group, and community) and in five consecutive years from 2005 to 2009. The effects of the two systems on seed production potential of four dominant species (Leymus chinensis, Stipa grandis, Agropyron cristatum, Cleistogenes squarrosa) were also investigated. Our results demonstrate that, in the traditional system, aboveground biomass production across all the levels of organization was reduced by grazing. In mixed system, however, no significantly negative relationship between the biomass response and stocking rate was detected at all organization levels. Precipitation fluctuation had strong influence on biomass responses, and compared to the traditional system the slope of the biomass-precipitation relationship tends to be higher in the mixed system. This effect might be attributed to the more positive response of L. chinensis and A. cristatum to increase in precipitation. In the traditional system, both the ratio and the density of reproductive tillers of the grazing subplots were significantly reduced compared to the haymaking or ungrazed control plots. In the mixed system, there was no significant difference between the haymaking subplots and the ungrazed control plots, regardless of the grazing pressures imposed on the haymaking subplots in the previous growing season. Our findings suggest that the mixed system mitigates the sheep grazing-induced species shift and it tends to be more responsive to increasing precipitation as compared to the traditional system. Therefore, replacement of the traditional grazing strategy with the mixed system could provide an important contribution to sustainable land-use of the Inner Mongolia grasslands.
机译：为了寻求更可持续的放牧管理系统，提出了一种混合管理系统（每年交替进行放牧和牧草），并针对内蒙古半干旱草原上的传统管理系统（始终用于放牧或牧草）进行了测试。现场操纵实验。从2005年到2009年连续五年，在组织的不同层次（即物种，植物功能组和群落）上检查了地上生物量对两种放牧管理系统的响应。这两种系统对种子生产潜力的影响还研究了四个优势种（羊草，大针茅，Agropyron cristatum，Cleistogenes squarrosa）。我们的结果表明，在传统系统中，放牧减少了组织各个层面的地上生物量生产。但是，在混合系统中，在所有组织级别上均未检测到生物量响应与放养率之间的显着负相关。降水波动对生物量的响应影响很大，与传统系统相比，混合系统中生物量-降水关系的斜率倾向于更高。这种作用可能归因于中华L. cristatum和C. cristatum对降水增加的更积极的反应。在传统系统中，放牧子图的生殖分ers的比率和密度都比牧草或未湿润的对照样地显着降低。在混合系统中，无论在前一个生长季节施加在干草制作图上的放牧压力如何，在干草制作图上和未湿润的控制样地之间都没有显着差异。我们的研究结果表明，与传统系统相比，混合系统减轻了绵羊放牧引起的物种转移，并且往往对增加的降水更加敏感。因此，用混合系统代替传统的放牧策略可以为内蒙古草原的可持续土地利用提供重要的贡献。

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