| 基于SPI的近53 a宁夏干旱时空演变特征研究 |
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| 引用本文： | 王允,刘普幸,曹立国,高原,雍国正.基于SPI的近53 a宁夏干旱时空演变特征研究[J].水土保持通报,2014(1):296-302. |
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| 作者姓名： | 王允 刘普幸 曹立国 高原 雍国正 |
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| 作者单位： | 西北师范大学地理与环境科学学院, 甘肃兰州 730070;西北师范大学地理与环境科学学院, 甘肃兰州 730070;南京大学海岸与海岛开发教育部重点实验室, 江苏南京 210046;西北师范大学地理与环境科学学院, 甘肃兰州 730070;西北师范大学地理与环境科学学院, 甘肃兰州 730070 |
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| 基金项目： | 国家自然科学基金项目"河西绿洲天然胡杨林生长的水盐过程和衰退机制"(40961035);甘肃省科技计划基金项目"河西绿洲天然胡杨林生长的水盐过程和衰退机制"(0803RJZA094) |
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| 摘 要： | 利用宁夏回族自治区9个气象站点1959-2011年的逐月降水数据计算其标准化降水指标(standardized precipitation index,SPI)值,并结合干旱站次比、干旱强度、气候倾向率及ArcGIS中反距离加权插值等方法,分析了研究区干旱的时空变化特征。结果表明,近53 a来,宁夏回族自治区年SPI在波动中呈降低的趋势,其变化倾向率为-0.131/10 a,呈更加干旱趋势,且干旱增幅以21世纪最大;从季节SPI变化来看,春、夏、秋季干旱呈增重趋势,但冬季有所缓解。从干旱发生的范围和强度来看,宁夏回族自治区重旱发生范围略有扩大,而轻旱和中旱略有减小,强度微呈减弱趋势;四季中,总体呈现出冬季干旱强度略增,范围缩小,春季干旱范围扩大。强度增强,而夏秋干旱范围缩小。宁夏回族自治区存在季节连旱频发现象,持续时间长,尤其是春、夏、秋跨季节连旱对农业生产影响最大。年和季节SPI的空间差异明显,表现为由北向南干旱的加重幅度逐渐增大,尤以南部山区对区域干旱变化的响应最为敏感。
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| 关 键 词： | 标准化降水指标(SPI) 干旱强度 反距离加权插值法 时空变化 宁夏 |
| 收稿时间： | 2013/3/20 0:00:00 |
| 修稿时间： | 2013/4/16 0:00:00 |
A Study on Spatial-temporal Variation Characteristics of Drought Based on Standardized Precipitation Index in Ningxia Hui Autonomous Region During Recent 53 Years |
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| WANG Yun,LIU Pu-xing,CAO Li-guo,GAO Yuan and YONG Guo-zheng.A Study on Spatial-temporal Variation Characteristics of Drought Based on Standardized Precipitation Index in Ningxia Hui Autonomous Region During Recent 53 Years[J].Bulletin of Soil and Water Conservation,2014(1):296-302. |
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| Authors: | WANG Yun LIU Pu-xing CAO Li-guo GAO Yuan and YONG Guo-zheng |
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| Institution: | College of Geography and Environment Science, Northwest Normal University, Lanzhou, Gansu 730070, China;College of Geography and Environment Science, Northwest Normal University, Lanzhou, Gansu 730070, China;Key Laboratory of Coast and Island Development of the Ministry of Education, Nanjing University, Nanjing, Jiangsu 210046, China;College of Geography and Environment Science, Northwest Normal University, Lanzhou, Gansu 730070, China;College of Geography and Environment Science, Northwest Normal University, Lanzhou, Gansu 730070, China |
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| Abstract: | The standardized precipitation index(SPI) was calculated based on monthly precipitation data observed at the nine weather stations in Ningxia Hui Autonomous Region from 1959 to 2011, and the spatial and temporal variation of drought was analyzed using the methods of drought station proportion, drought intensity, climate trending rate and the inverse distance weighted interpolation in ArcGIS. Results showed that annual SPI in Ningxia in recent 53 years decreased with an average rate of-0.131/10 a, which was the largest increase in the 21st century. As for the seasonal change of the SPI, drought in spring, summer and autumn was becoming heavier slightly, while in winter, it was becoming lighter. In view of the scope and drought intensity, the heavy drought expanded slightly in the study area, and yet the light and medium drought declined slightly both in scope and intensity. In the four seasons, drought intensity in winter increased slightly, but its scope shrunk; in spring, both drought intensity and scope increased; and in summer and autumn, drought intensity decreased and its scope shrunk. Continuous seasonal drought occurred from spring to autumn had the greatest impact on agricultural production. Spatial differences of annual and seasonal SPI were obvious. From north to south, drought was gradually aggravated, especially in the southern mountains, the most sensitive to change of regional drought. |
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| Keywords: | SPI drought intensity IDW interpolation spatial and temporal variation Ningxia Hui Autonomous Region |
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