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首页> 外文期刊>Regional Environmental Change >The potential for sand dams to increase the adaptive capacity of East African drylands to climate change
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The potential for sand dams to increase the adaptive capacity of East African drylands to climate change

机译：沙坝可能提高东非干旱地区对气候变化的适应能力

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摘要

Drylands are home to more than two billion people and are characterised by frequent, severe droughts. Such extreme events are expected to be exacerbated in the near future by climate change. A potentially simple and cost-effective mitigation measure against drought periods is sand dams. This little-known technology aims to promote subsoil rainwater storage to support dryland agro-ecosystems. To date, there is little long-term empirical analysis that tests the effectiveness of this approach during droughts. This study addresses this shortcoming by utilising multi-year satellite imagery to monitor the effect of droughts at sand dam locations. A time series of satellite images was analysed to compare vegetation at sand dam sites and control sites over selected periods of drought, using the normalised difference vegetation index. The results show that vegetation biomass was consistently and significantly higher at sand dam sites during periods of extended droughts. It is also shown that vegetation at sand dam sites recovers more quickly from drought. The observed findings corroborate modelling-based research which identified related impacts on ground water, land cover, and socio-economic indicators. Using past periods of drought as an analogue to future climate change conditions, this study indicates that sand dams have potential to increase adaptive capacity and resilience to climate change in drylands. It therefore can be concluded that sand dams enhance the resilience of marginal environments and increase the adaptive capacity of drylands. Sand dams can therefore be a promising adaptation response to the impacts of future climate change on drylands.
机译：干旱地区拥有超过20亿人口，其特点是经常发生严重的干旱。预计在不久的将来，气候变化会加剧这种极端事件。可能有一种简单而经济有效的缓解干旱的措施是沙坝。这项鲜为人知的技术旨在促进地下土壤雨水的储存，以支持旱地农业生态系统。迄今为止，几乎没有长期的经验分析来检验这种方法在干旱期间的有效性。这项研究通过利用多年的卫星图像监测沙坝位置干旱的影响来解决这一缺陷。使用归一化差异植被指数，分析了卫星图像的时间序列，以比较选定干旱时期沙坝站点和控制站点的植被。结果表明，在长期干旱期间，沙坝坝址的植被生物量一直且显着较高。研究还表明，沙坝站点的植被从干旱中恢复得更快。观察到的发现证实了基于建模的研究，该研究确定了对地下水，土地覆盖和社会经济指标的相关影响。以过去的干旱时期作为未来气候变化条件的模拟，这项研究表明，沙坝有潜力提高干旱地区对气候变化的适应能力和适应力。因此可以得出结论，沙坝增强了边缘环境的复原力并增加了旱地的适应能力。因此，沙坝可能是对未来气候变化对旱地的影响的有希望的适应措施。

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