唐河流域地表径流水化学和稳定同位素空间分布特征及差异解析
首发时间:2021-03-18
摘要:本文以海河流域白洋淀上游的唐河为研究对象,对流域水体的水化学成分和氢氧稳定同位素组成的时间和空间特征进行了取样分析,结合流域土地利用情况,阐明了唐河流域空间产水、耗水差异及其驱动因素。研究结果表明:流域内径流量、地表水化学特征及氢氧同位素组成受土地变化影响为主。上游土地利用主要是耕地和大型林地,蒸腾作用旺盛,上游的巨大耗水量主要是蒸腾作用所致;中游的土地利用以草地为主,蒸发蒸腾作用都较弱,耗水量较少;下游土地开阔,温度高海拔低,蒸发作用强烈,农田较中游增多,耗水又开始增加。山西产流少,耗水量巨大,从山西流向河北补给的水很少,地表水含盐量及同位素富集明显,山西的大量用水给河北省平原的用水造成压力。为了增加流域径流产水量,农业节水迫在眉睫。
关键词: 地表径流 农业节水 水化学 稳定同位素 土地利用 唐河
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Spatial distribution characteristics and differences of surface runoff water chemistry and stable isotopes in the Tanghe River Basin
Abstract:In order to determine the spatial change and connection between water consumption and land use in the tanghe river basin, and to obtain the main driving factors for the decrease of runoff, a field hydrological survey was conducted in the tanghe river basin. The results show that the upstream land use of the river are dominated by cultivated land and large forestland, and transpiration is vigorous. The land use in the middle reaches is mainly grassland with weak evapotranspiration and less water consumption. The land in the downstream is open, the temperature is high and the altitude is low. Thus ,the the evaporation is intense in the downstream. The catchment in Shanxi province produces less water while consumes a lot. The water flowing from Shanxi to Hebei is very little, which causes great pressure to the water use of Hebei province. In order to increase the runoff in the tang river basin, it is urgent to save agricultural water in the upstream and downstream of Tanghe catchment.
Keywords: Runoff Agricultural Water Saving Hydrochemistry Stable isotopes Land use Tang He
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唐河流域地表径流水化学和稳定同位素空间分布特征及差异解析
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