岷江上游流域干旱河谷边界位移与气候变化数据集

Dataset Development of Arid Valley Boundary Displacement and Climate Variability in the Upper Reaches of the Minjiang River

干旱河谷是中国横断山区一种独特的地理生态景观类型,干旱河谷边界位移是山地自然生态系统对气候变化的响应指标之一。基于SPOT遥感影像,采用双轨判读、人工目视解译方式,得到岷江上游流域干旱河谷边界数据;利用流域气象站点数据,采用径向基函数法,明确了岷江上游气象要素(年平均气温、年降水量、年日照时数、年均相对湿度、年蒸发量)变化趋势的空间分异;并探讨了1999-2013年岷江上游干旱河谷边界位移对区域气候变化的响应特征。结果表明:1999-2013年,岷江上游气候呈现出暖湿化趋势;干旱河谷边界的平均海拔下降(0.76±0.26 m/a),并与区域年降水量变化(p=0.011<0.05)、年相对湿度变化(p=0.020<0.05)以及气候变化(p=0.010<0.05)有明显的负相关性。因此,干旱河谷边界的下移表明流域气候变化有利于干旱河谷生境的改善。该数据集的研发丰富了岷江上游流域气候变化信息,准确反映了流域干旱河谷边界位移的基本趋势,可为深化全球变化下的区域响应研究、指导干旱河谷区生态建设提供数据支撑。该数据集存储为.shp、.tif、.xslx数据格式,由46个数据文件组成,数据量为6.34 MB(压缩为1个文件,2.59 MB)。

Arid valleys are unique geoecological environments within humid environments,and the displacement of the arid valley boundary is one of the response indicators of mountain natural ecosystems to climate change.Through visual interpretation of SPOT images by two individuals,the arid valley boundary in the upper reaches of the Minjiang River was obtained.The spatial distributions of climatic factors(annual average temperature,annual precipitation,annual sunshine duration,annual relative humidity,and annual evaporation)in the study area were clarified using the radial basis function method.Finally,the response of arid valley boundary displacement to regional climate change between 1999 and 2013 was studied.The results were as follows:(1)the climate in the upper reaches of the Minjiang River exhibited a warm and humid trend between 1999 and 2013.(2)The average elevation of the arid valley boundary decreased by–0.76±0.26 m/a.This decrease was significantly associated with the variability of climate(p=0.010<0.05),precipitation(p=0.011<0.05),and relative humidity(p=0.020<0.05).Therefore,the downward trend of the arid valley boundary reflects the improvement in the hydrothermal balance from 1999–2013 due to climate variation.The dataset provides additional information on climate change in the upper reaches of the Minjiang River.The data accurately reflect the primary displacement trend of the arid valley boundary within the basin.This study could support further research on regional responses to global change and guide ecological construction in arid valley areas.The dataset is archived in.shp,.tif,and.xlsx data formats,with a data size of 6.34 MB(compressed into one file with a data size of 2.59 MB).