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首页> 外文期刊>Regional Environmental Change >Rewilding of large herbivore communities in high elevation Puna: geographic segregation and no evidence of positive effects on peatland productivity
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Rewilding of large herbivore communities in high elevation Puna: geographic segregation and no evidence of positive effects on peatland productivity

机译：高海平普纳大型食草动物社区的再次综合：地理隔离，没有关于泥炭地生产力积极影响的证据

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摘要

During the past decades, the Argentine Puna (a subtropical high elevation desert of c. 14 million hectares) has been going through a process of "rewilding" of large herbivore communities. In response to rural population outmigration and resulting livestock reduction accompanied by protection measures, large wild herbivores such as vicunas increased. To explore the ecological consequences of this transition, we analysed the spatial patterns of wild herbivores and livestock in relation to human settlements, and we estimated the changes in vegetation productivity of peatlands, using NDVI derived from MODIS satellite images between 2001 and 2012. Peatlands are key ecosystems in high elevation deserts; they regulate water and carbon fluxes and provide most forage for livestock and wildlife. A field survey of 50 peatlands revealed that travel time from human settlements was positively correlated with the wild herbivore abundance, and negatively correlated with livestock abundance (especially sheep and goats). Thus, it is a good indicator of livestock use. At the regional scale, after controlling for the physical and climatic variables of the 8134 peatlands, accessibility from human settlements explained less than 0.1% of mean and interannual NDVI variability. These results provide no evidence of livestock-induced degradation. Furthermore, likely due to rainfall increase, peatlands showed an overall positive NDVI trend between 2001 and 2012, but isolated peatlands showed comparatively more negative NDVI trends during the same period, possibly associated with increased wildlife herbivory. Similar rewilding processes could occur in many mountain regions undergoing decreasing human population and marginal land uses. Our study suggests that traditional management could contribute to the productivity, stability, and resilience of peatlands.
机译：在过去的几十年中，阿根廷普陀（C.1400万公顷的亚热带高海洋沙漠）一直经历了大型食草动物社区的“重建”的过程。为了应对农村人口的迁移和畜牧业伴随着保护措施，大型野生食草动物如vicunas增加。为了探讨这种过渡的生态后果，我们分析了与人类住区有关的野生食草动物和牲畜的空间模式，我们估计了泥炭地植被生产率的变化，利用2001年至2012年之间的MODIS卫星图像衍生的NDVI。泥炭地是高海拔沙漠中的主要生态系统;它们调节水和碳通量，并为牲畜和野生动物提供大多数饲料。对50个泥炭地的田间调查显示，人类沉淀的旅行时间与野生食草动物丰富呈正相关，与牲畜丰度（特别是绵羊和山羊）负相关。因此，它是牲畜使用的良好指标。在区域规模，在控制8134泥炭块的物理和气候变量后，人类住区的可访问性低于平均和际NDVI变异的0.1％。这些结果不提供牲畜诱导的降解的证据。此外，由于降雨量增加，泥炭地在2001年至2012年期间显示了整体阳性NDVI趋势，但孤立的泥炭块在同一时期内表现出相对的负面的NDVI趋势，可能与增加的野生动物草食有关。在许多正在进行的人口和边际土地使用的许多山区可能发生类似的可复合过程。我们的研究表明，传统管理可以促进泥炭地的生产力，稳定性和韧性。

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  • 来源
    《Regional Environmental Change》 |2020年第4期|112.1-112.11|共11页
  • 作者

    Navarro Carlos J.; Izquierdo Andrea E.; Araoz Ezequiel; Foguet Javier; Grau H. Ricardo;

  • 作者单位

    Univ Nacl Tucuman Consejo Nacl Invest Cient & Tecnol CONICET Inst Ecol Reg CC34 CP4107 Yerba Buena San Miguel De Tucuman Argentina;

    Univ Nacl Tucuman Consejo Nacl Invest Cient & Tecnol CONICET Inst Ecol Reg CC34 CP4107 Yerba Buena San Miguel De Tucuman Argentina;

    Univ Nacl Tucuman Consejo Nacl Invest Cient & Tecnol CONICET Inst Ecol Reg CC34 CP4107 Yerba Buena San Miguel De Tucuman Argentina;

    Univ Nacl Tucuman Consejo Nacl Invest Cient & Tecnol CONICET Inst Ecol Reg CC34 CP4107 Yerba Buena San Miguel De Tucuman Argentina;

    Univ Nacl Tucuman Consejo Nacl Invest Cient & Tecnol CONICET Inst Ecol Reg CC34 CP4107 Yerba Buena San Miguel De Tucuman Argentina;

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  • 正文语种 eng
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  • 关键词

    Herbivory; Land use change; Rewilding; Peatlands; Primary productivity; Puna;

    机译：草食病;土地利用变化;再次;泥炭地;初级生产力;普纳;

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