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Unravelling the role of vegetation on the different trends between climatic and hydrologic drought in headwater catchments of Spain
Anthropocene ( IF 3.6 ) Pub Date : 2021-08-31 , DOI: 10.1016/j.ancene.2021.100309
D. Peña-Angulo 1 , S.M. Vicente-Serrano 1 , F. Domínguez-Castro 2, 3 , I. Noguera 1 , M. Tomas-Burguera 4 , J.I. López-Moreno 1 , J. Lorenzo-Lacruz 5 , A. El Kenawy 6, 7
Affiliation  

The availability of water resources is a major challenge of the Mediterranean region. Intense land use transformation has impacted the headwaters of river basins that generate most of the water resources, reducing streamflow This study analyses the evolution of hydrological and climatic drought in headwater catchments of Spain and it explores the extent to which vegetation can reinforce trends in hydrological drought severity in comparison to the evolution of cFlimatic drought severity. We have used the Standardized Precipitation Evapotranspiration Index and Standardized Streamflow Index to examine hydrological and climatic drought, respectively, and examined the changes in the frequency, magnitude, and duration of climatic and hydrologic droughts over non-perturbed headwater catchments of Spain from 1961 to 2013. We quantified vegetation changes over time in the analysed catchments and we compared the changes in the climatic and hydrological droughts with changes in vegetation coverage using Pearson’s r correlations and linear regression model. The results show that the trends toward higher frequency, duration and severity of hydrological droughts are more marked than the observed trends in climatic droughts, which can be associated to the dominant increase in vegetation coverage and activity in the study domain. Finally, it is concluded that the spatial differences observed between the trends of climatic and hydrological droughts show some relationship with the patterns of forest succession observed in recent decades. Our results stress the relevance of land transformation processes on trends in water resources availability, particularly during periods of climatic droughts in which competence between vegetation water consumption and streamflow production is much more relevant.



中文翻译:

阐明植被对西班牙源头集水区气候和水文干旱之间不同趋势的作用

水资源的可用性是地中海地区的主要挑战。激烈的土地利用转变影响了产生大部分水资源的流域的源头,减少了流量 本研究分析了西班牙源头集水区水文和气候干旱的演变,并探讨了植被在多大程度上加强了水文干旱趋势与 cFlimatic 干旱严重程度的演变相比。我们分别使用标准化降水蒸散指数和标准化流量指数来检验水文和气候干旱,并检验了 1961 年至 2013 年西班牙非扰动源头集水区气候和水文干旱的频率、幅度和持续时间的变化. 我们量化了所分析流域中植被随时间的变化,并使用 Pearson r 相关性和线性回归模型将气候和水文干旱的变化与植被覆盖率的变化进行了比较。结果表明,与气候干旱的观测趋势相比,水文干旱频率、持续时间和严重程度更高的趋势更显着,这可能与研究域中植被覆盖度和活动的显着增加有关。最后,得出的结论是,气候和水文干旱趋势之间观察到的空间差异与近几十年来观察到的森林演替模式有一定的关系。我们的结果强调了土地转型过程与水资源可用性趋势的相关性,

更新日期:2021-09-21
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