摘要
为了探究漓江流域上游水沙对气候和土地利用变化的响应特征,基于气温、降水量、径流量、输沙量,结合土地利用数据和归一化植被指数(NDVI)数据,应用Mann-Kendall检验法、双累积曲线法分析漓江上游水文气象要素变化趋势,利用累积量斜率变化率比较法定量揭示气候因子对上游径流变化的贡献率,结合植被覆盖变化特征探讨土地利用类型变化对河流水沙的影响。结果表明:1965—2019年漓江流域上游气温呈显著增加趋势,降水量、径流量、输沙量未呈现显著增加或减少趋势,同时期NDVI呈上升趋势,但土地利用结构未发生明显变化,仍以林地、耕地为主。漓江上游气温未出现突变点,降水量与径流量于1991年发生突变,1992—2019年漓江上游NDVI平均值显著高于突变前的1981—1991年,耕地面积平均值与林地面积平均值显著低于突变前的1981—1991年;输沙量于2003年发生突变,2004—2019年漓江上游NDVI平均值与建设用地面积平均值显著高于1981—2003年。降水对径流改变的贡献率为56.30%,降水量-径流量关系并未在突变点前后发生改变。降水量对输沙量改变的贡献率为-12.67%,降水量-输沙量关系在突变后发生改变。
In order to explore the variation characteristics of water and sediment and their responses to the climate and land use changes and normalized difference vegetation index(NDVI)datasets in the upper reaches of Lijiang River Watershed,the linear tendency estimation method and moving average method were applied to study the trends of temperature,precipitation,runoff,and sediment concentrations from 1965 to 2019.The cumulative slope rate comparison method was used to quantitatively analyze the contribution ratio of climate change to runoff variation.Based on the characteristics of vegetation change,the influence of land use type change on river sediment was studied.Results show that the temperature has an obvious increasing trend,but there are not significant trend for precipitation,runoff,and sediment concentrations.During the study period,NDVI in the upper reaches of Lijiang River showes an upward trend.The overall land use structure of in the upper reaches of Lijiang River does not change significantly,which is still mainly composed woodland and cultivated land.There is no abrupt change year in temperature.The abrupt change year in precipitation and runoff is 1991.The average NDVI in upper Lijiang River from 1992 to 2019 is significantly higher than that from 1981 to 1991,and the average values of plough area and forest area from 1992 to 2019 are significantly lower than those from 1981 to 1991.The abrupt change year of sediment concentrations is 2003.The average NDVI and construction land area in the upper reaches of the Li River from 2004 to 2019 also are significantly higher than those from 2004 to 2019.According to the slope change ratio of cumulative quantity method,the contribution ratio of precipitation to runoff is 56.30%,but the abrupt change of runoff does not change the relationship between precipitation and runoff.The contribution ratio of precipitation to sediment is-12.67%,but the abrupt change of sediment concentrations change the relationship between precipitation and sediment concentrations.
作者
方荣杰
黄卉
张帅普
代俊峰
蒋立新
许景璇
FANG Rongjie;HUANG Hui;ZHANG Shuaipu;DAI Junfeng;JIANG Lixin;XU Jingxuan(Guangxi Key Laboratory of Environmental Pollution Control Theory and Technology,Guilin University of Technology,Guilin 541006,China;Collaborative Innovation Center for Water Pollution Control and Water Safety in Karst Area,Guilin University of Technology,Guilin 541006,China;Hydrology Center of Guilin City,Guilin 541001,China)
出处
《桂林理工大学学报》
CAS
北大核心
2024年第1期115-122,共8页
Journal of Guilin University of Technology
基金
国家重点研发计划项目(2019YFC0507500)
广西重点研发计划项目(AB22035075)。
关键词
水沙特征
气候变化
土地利用
贡献率
漓江
water and sediment characteristics
climate change
contribution rate
land use
Lijiang River
