Spatial Differences in the Response of Runoff to Climate and Land Use Changes in the Yiluo River Basin  

伊洛河流域径流对气候和土地利用变化响应的空间差异

作　　者：CHEN Nuo WANG Rui 陈诺;王蕊(中国科学院地理科学与资源研究所,中国科学院资源利用与环境修复重点实验室,北京100101;中国科学院大学,北京100049)

机构地区：[1]Key Laboratory for Resource Use&Environmental Remediation,Institute of Geographic Sciences and Natural Resources Research,Chinese Academy ofSciences,Beijing 100101,China [2]University of Chinese Academy of Sciences,Beijing 100049,China

出　　处：《Journal of Resources and Ecology》2024年第5期1299-1310,共12页资源与生态学报（英文版）

基　　金：The National Natural Science Foundation of China(52130907)。

摘　　要：Accurately identifying the spatial differences in the response of regional runoff to climate and land use changes can clarify the mechanism of regional runoff changes and provide a scientific basis for adopting the appropriate water resource protection policies.In this study,based on the Budyko theory,we quantitatively evaluated the spatial differences in the response of runoff to climate and land use changes in the Yiluo River Basin after 2000;calculated the sensitivity of runoff changes to precipitation(P),potential evapotranspiration(E_(0))and land use changes;and quantified the contributions of those three factors to runoff changes.The findings revealed that with decreasing elevation,precipitation gradually decreases,potential evapotranspiration gradually increases,and runoff gradually decreases in the Yiluo River basin.Influenced by the population density,both cultivated land and construction land are widely distributed with the middle and lower reaches of the basin,while the upper reaches are dominated by forest land.Compared with the base period(1985-1989),precipitation and potential evapotranspiration in the watershed during the change period(2000-2017)basically showed decreasing and increasing trends,respectively,with obvious spatial differentiation.P increased significantly in the upper reaches of the Yi River,with an average of 35.2 mm(-83.8-84.7 mm),while P increased and decreased in the other five subbasins,but the decreasing trend was more prominent.Among the subbasins,the upper and middle reaches of the Luo River showed the largest reductions in P,with an average of-34.2 mm(-145.9-20.6 mm),whereas the middle reaches of the Yi River showed the smallest reduction in P,with an average of-10.9 mm(-84.2-59.5 mm).The E_(0)in the different regions during the change period showed an increasing trend,and the increase in E_(0)gradually decreased from the upper reaches to the lower reaches.The E_(0)in the upper reaches of the Luo River showed the largest change,with an average of 45.3 mm(38.2-48.3 mm),while t准确识别区域径流对气候与土地利用变化响应的空间分异,有利于明晰区域径流变化机理,为采取正确的水资源保护政策提供科学依据。本研究基于Budyko理论,定量评价了伊洛河流域2000年后径流对气候和土地利用变化响应的空间差异,计算了径流变化对降水、潜在蒸散发E_0和土地利用变化的敏感性,量化三者对径流变化的贡献。结果表明,随海拔降低,伊洛河流域降水量逐渐降低,潜在蒸散量逐渐升高,径流量逐渐减小。受人口密度影响,耕地和建设用地广泛分布于流域中下游地区,而上游以林地为主。与基准期(1985-1989年)相比,变化期(2000-2017年)流域降水、潜在蒸散发分别呈现降低和增高的趋势,且具有明显的空间分异。伊河上游降水量显著增加,平均为35.2 mm(-83.8-84.7 mm),其它五个子流域降水量则以减少趋势更为突出;其中,洛河中上游减少幅度最大,平均为-34.2 mm(-145.9-20.6 mm),而伊河中游减少幅度最小,平均为-10.9 mm(-84.2-59.5 mm)。不同区域潜在蒸散发自上游向下游增加幅度逐渐减弱;洛河上游E_0变化最大,平均为45.3 mm(38.2-48.3mm),而伊洛河下游变化最小,平均为7.3 mm(-3.2-17.1 mm)。土地利用变化则主要表现为中下游地区耕地向建设用地转化。径流变化与降水变化呈正相关关系,而与潜在蒸散发和土地利用变化呈负相关关系。径流对降水、潜在蒸散发和土地利用变化的敏感性系数绝对值均随海拔的降低呈下降趋势,表明气候向暖干方向变化时,流域径流对各种环境变化的响应敏感度均会逐渐降低。降水减少和潜在蒸散发变化分别导致径流量减小4.7-17.4 mm和0.7-9.1 mm,而土地利用变化导致径流量减少了23.0-46.5mm,可见相较于气候波动,土地利用变化更容易引发流域径流的变化。伊洛河流域以耕地为最主要的土地利用类型,尤其中下游受人类活动影响最大,生态环境脆弱,近年来径

关 键 词：Budyko hypothesis RUNOFF attribution analysis spatial difference Yiluo River Basin 

分 类 号：F301.2[经济管理—产业经济] P333[天文地球—水文科学] P467[水利工程—水文学及水资源]