Land use change effects on catchment streamflow response in a humid tropical montane cloud forest region, central Veracruz, Mexico,Hydrological Processes

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Land use change effects on catchment streamflow response in a humid tropical montane cloud forest region, central Veracruz, Mexico
Hydrological Processes ( IF 2.8 ) Pub Date : 2020-06-22 , DOI: 10.1002/hyp.13800
Sergio M. López‐Ramírez ₁ , Leonardo Sáenz ₁ , Alex Mayer ₁ , Lyssette E. Muñoz‐Villers ₂ , Heidi Asbjornsen ₃ , Z. Carter Berry ₄ , Nathaniel Looker ₅ , Robert Manson ₆ , León Rodrigo Gómez‐Aguilar ₆

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Tropical montane cloud forests (TMCF) are recognized for their capacity to maintain high dry‐season baseflow and a host of other ecosystem services. Substantial areas of TMCF have been converted to pasture and crops such as coffee, while in other areas TCMF are recovering. However, little is known about the effects of this complex dynamic on catchment hydrology. We investigated the effect of land use on rainfall‐runoff response in five neighbouring headwater micro‐catchments in central Veracruz, Mexico, dominated by either mature TMCF (MF), young (20 year‐old) and intermediate (40 year‐old) naturally regenerating TMCF (YF and IF, respectively), shaded coffee (SC), and an intensively grazed pasture (IP). We used a 4‐year record of high‐resolution rainfall and streamflow (10 min) data collected from 2015 to 2019. These data were analysed via comparison of hydrologic metrics that summarize streamflow responses at various time scales and magnitudes. Results showed no statistical difference in the regulation capacity of high flows in the micro‐catchment with 20 years of natural regeneration, compared to the MF. In terms of baseflow sustenance, our results support the hypothesis that MF and IF better promote this hydrologic service than the other land uses. SC exhibited a high capacity to modulate peak flows comparable to that of MF, and an intermediate capacity to sustain baseflow, suggesting that the integrated functioning of this micro‐catchment was largely preserved. Finally, 40 years of intense pasture management was found to have degraded the soil hydraulic properties of IP; mainly, reducing its infiltration capacity, causing a fivefold greater peak flow response and a lower baseflow compared to MF.

中文翻译：

墨西哥韦拉克鲁斯中部湿润的热带山地云雾林地区的土地利用变化对流域径流响应的影响

热带山地云雾森林（TMCF）拥有维持高旱季基流和许多其他生态系统服务的能力，因此受到认可。TMCF的大部分地区已转变为牧场和咖啡等农作物，而其他地区的TCMF正在恢复。但是，对于这种复杂的动力学对流域水文学的影响知之甚少。我们调查了墨西哥韦拉克鲁斯中部五个相邻源头微流域的土地利用对降雨径流响应的影响，其中以成熟的TMCF（MF），自然的年轻人（20岁）和中间的（40岁）为主再生TMCF（分别为YF和IF），阴影咖啡（SC）和集约化牧场（IP）。我们使用了从2015年到2019年收集的高分辨率降雨和流量（10分钟）数据的4年记录。通过比较水文指标来分析这些数据，这些指标总结了各种时间尺度和大小下的水流响应。结果表明，与MF相比，具有20年自然更新的微型集水区的高流量调节能力没有统计学差异。在基本流量维持方面，我们的结果支持以下假设：MF和IF比其他土地利用更好地促进了这种水文服务。SC具有与MF相当的调节峰值流量的能力，并且具有维持基本流量的中等能力，这表明该微集水区的综合功能得以保留。最后，发现40年的集约化牧场管理降低了IP的土壤水力特性。主要是降低其渗透能力，

更新日期：2020-06-22

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