Global Assessment of the Non-Equilibrium Theory of Rangelands: Revisited and Refined
Global Assessment of the Non-Equilibrium Theory of Rangelands: Revisited and Refined
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DOI：
10.1016/j.landusepol.2017.11.026
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发表时间：
2017-07
期刊：
影响因子：
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通讯作者：
J. Engler;H. von Wehrden
中科院分区：
文献类型：
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作者：
J. Engler;H. von Wehrden
我们重新调查证据的非平衡概念牧场使用地理参考数据库N = 83研究发表在同行评议的期刊。在von Wehrden等人（2012年）先前研究的基础上，我们使用他们的全球降雨变化图及其方法，根据研究地区是否存在水源或关键资源，区分三种不同类型的退化。针对牧场科学界最近的讨论，我们在数据库中将商业用途或生计用途作为参数加以区分。我们发现，地带性退化，即退化没有水或关键资源的存在，主要是报告的位置与降水变异系数低于33%的阈值，提出了非平衡概念。我们没有发现任何统计证据表明商业性耕作和自给性耕作在退化发生率方面存在系统性差异。
We re-investigate evidence for the non-equilibrium concept for rangelands using a georeferenced data base ofN= 83 studies published in peer-reviewed journals. Following up on a previous study by von Wehrden et al. (2012), we use their global map of rainfall variability and their method to distinguish between three different types of degradation depending on the presence or absence of water sources or key resources in the studied areas. Addressing recent discussions in the rangeland science community, we include the distinction between commercial or subsistence use as parameter in our data base. We find that zonal degradation, i.e. degradation with no presence of water or key resources, is predominantly reported for locations with a precipitation coefficient of variation below the threshold of 33%, as proposed by the non-equilibrium concept. We do not find any statistical evidence for a systematic difference between commercial and subsistence farming in terms of degradation incidence.