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| 黄土高原地区50年降水时空动态与趋势分析 | |
| 引用本文： | 段建军,王小利,高照良,张彩霞.黄土高原地区50年降水时空动态与趋势分析[J].水土保持学报,2009,23(5). |
| 作者姓名： | 段建军 王小利 高照良 张彩霞 |
| 作者单位： | 1. 中国科学院水利部水土保持研究所,陕西,杨凌,712100;贵州大学农学院,贵州,贵阳,550025;中国科学院研究生院,北京,100039 2. 贵州大学农学院,贵州,贵阳,550025 3. 中国科学院水利部水土保持研究所,陕西,杨凌,712100;西北农林科技大学资源环境学院,陕西,杨凌,712100 4. 西北农林科技大学资源环境学院,陕西,杨凌,712100 |
| 基金项目： | 中国科学院西部行动计划(二期)项目，中国科学院知识创新工程重要方向性项目 |
| 摘 要： | 基于黄土高原及周边地区74个气象站1952-2001年降水量数据,计算各站年降水量线性趋势系数,利用ArcGIS地统计模块普通Kriging插值法生成黄土高原地区1952-2001年年降水量和年降水量线性趋势表面,分析年降水量、年降水量线性趋势表面时空分布特征与10年尺度降水量带动态变化.结果表明,黄土高原地区1952-2001年平均年降水量(426.69±67.85)mm.年降水量和年降水量线性趋势存在显著时空分异;年降水量由西向东线性增加,从南到北二次曲线递减.总体上东南西北方向递减;10年尺度平均年降水量减少趋势明显,递减率-10.019 mm/10 a,期间累计减少1 227,33 mm 1200,400,600 mm降水线南移,干旱半干旱区面积不显著扩大,湿润半湿润区显著缩小,气候呈干旱化趋势;年降水量线性趋势系数从-4.10 mm/a到4.46 mm/a,平均-0.98 mm/a,降水量呈增加趋势地区面积16.36万km~2.呈减少趋势地区面积46.27万km~2,分占黄土高原地区总面积26.12%和73.88%. |
| 关 键 词： | 黄土高原地区1年降水量 时空动态}趋势分析 |
Dynamics and Trends Analysis of Annual Precipitation in the Loess Plateau Region for 50 years |
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| DUAN Jian-jun,WANG Xiao-li,GAO Zhao-liang,ZHANG Cai-xia.Dynamics and Trends Analysis of Annual Precipitation in the Loess Plateau Region for 50 years[J].Journal of Soil and Water Conservation,2009,23(5). | |
| Authors: | DUAN Jian-jun WANG Xiao-li GAO Zhao-liang ZHANG Cai-xia |
| Abstract: | Annual precipitation data and their linear trend coefficients were collected and produced at 74 climate stations in or around loess plateau region from 1952 to 2001 which were interpolated in ArcGIS 9. 3 using geostatistical method. Results analyzing the surfaces of annual precipitation, linear trend coefficients and precipitation regions at a ten year scale showed that variability of annual precipitation and precipitation linear trend coefficients was obvious in spatial and temporal fields. Annual precipitation in loess plateau region from 1952 to 2001 was (426. 69±7. 85) mm. Annual precipitation decreased linearly from east to west, parabolically from south to north and in general from southeast to northwest. Lapse rate of averaged annual precipitation was -10. 019 mm/10 a and accumulated decreased precipitation amount was 1 227. 33 mm in the period. Annual precipitation linear trend coefficients was from -4. 10 mm/a to 4. 46 mm/a in the region, mean of which was -0. 98 mm/a. Area with a positive coefficient was 163 600 km~2 mainly located in the north and west which was 26. 12% of the total region and area with minus coefficient was 462 700 km~2 mainly located in the middle and south of the region. Precipitation contour lines of 200, 400, 600 mm moved south continuously in the period, so area of humid and semi humid region decreased yet that of arid and semi-arid region increased obviously. |
| Keywords: | loess plateau region annual precipitation special and temporal dynamics trends analysis |
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