The role of peat-forming bofedales in sustaining baseflow in the humid puna

The role of peat-forming bofedales in sustaining baseflow in the humid puna
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泥炭形成的 bofedales 在维持潮湿普纳基流中的作用

DOI:
10.1016/j.ejrh.2023.101394
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发表时间:
2023
期刊:
Journal of Hydrology: Regional Studies
影响因子:
--
通讯作者:
Oshun, Jasper
Oshun, Jasper
中科院分区:
--
文献类型:
--
作者:
Wunderlich, Wyeth;Lang, Margaret;Keating, Kristina;Perez, Wilner Bandera;Oshun, Jasper

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研究区域秘鲁中部安第斯山脉的潮湿普纳研究重点Bofedales或泥炭形成的湿地是整个中部安第斯山脉的潮湿普纳的典型特征-高海拔、季节性干燥的草地和灌木地。尽管潮湿的普纳下游社区的水文重要性,并推断bofedales发挥重要作用,很少有研究探讨了这个生态系统的水文,没有量化bofedal水产量流。我们在Ramuschaka上游流域(URW)设计了一项为期3年的研究,该流域是一个2.12平方公里的潮湿普纳集水区,维持着一条用于下游灌溉的常年溪流。我们监测水文通量通过URW,定期测量流量在19个嵌套子流域在雨季和旱季,其特征在于结构,水力特性,和存储容量的四个bofedales。该地区新的水文见解单位径流量始终较高的子流域更大bofedal覆盖。高孔隙度泥炭在雨季通过地下水补给填充,并通过具有低水力传导性的下层缓慢排水。Bofedales占URW的11.6%,季节性蓄水量为105,000 ± 10,000 m3。在旱季,bofedales的径流量为49±5毫米,相当于URW旱季径流量的20-98%。Bofedales调节从潮湿的普纳到下游社区的排水,因此对地方和区域的水安全至关重要。
Study region Humid puna of the Central Andes, Perú Study focus Bofedales, or peat-forming wetlands, are a characteristic feature of the humid puna-a high elevation, seasonally dry grass-and shrub-land throughout the Central Andes. Despite the hydrologic importance of the humid puna for downstream communities, and the inference that bofedales play an important role, few studies have explored the hydrology of this ecosystem, and none have quantified bofedal water yield to streams. We designed a 3-year study in the Upper Ramuschaka Watershed (URW), a 2.12 km 2 humid puna catchment sustaining a perennial stream used for irrigation downstream. We monitored hydrologic fluxes through the URW, periodically measured discharge in 19 nested subbasins across wet and dry seasons, and characterized the structure, hydraulic properties, and storage capacity of four bofedales. New hydrological insights for the region Unit runoff is consistently higher in subbasins with greater bofedal coverage. High porosity peat fills in the wet season via groundwater recharge and drains slowly through underlying layers with low hydraulic conductivity. Bofedales cover 11.6% of the URW and store 105,000±10,000 m 3 of water seasonally. In the dry season, bofedales yield 49±5 mm to streams, equivalent to 20–98% of the URW’s dry season runoff. Bofedales regulate drainage from the humid puna to downstream communities and are therefore vital to local and regional water security.
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