黄土高原气候生产力演变特征

Evolvement of Climate-productivity over Chinese Loess Plateau

利用黄土高原地区40a的气象资料,采用EOF、REOF、EEOF、CEOF分解和小波分析等方法,研究了该区域气候生产力时空演变特征.结果表明：黄土高原气候生产力呈递减趋势;存在相关程度高的3个次区域（西部、东部和南部）,次区域间气候生产力时间演变差异较大;小波分析表明气候生产力变化2～4a周期振荡比较明显;气候生产力变化空间系统的移动方向、强度等在4a内变化明显;高原中北部是气候生产力变化的敏感区;气候生产力的空间变化幅度南部明显大于北部,变化信息有从高原中东部向四周传播的趋势.

Based on the meteorological date from 1961 to 2000 in Chinese Loess Plateau, the spatial and temporal variations of climate-productivity in Chinese Loess Plateau were investigated, by applying Empirical Orthogonal Function （EOF）, Rotated Empirical Orthogonal Function（REOF）, Expand Empirical Orthogonal Function （EEOF） ,Complex Empirical Orthogonal Function（CEOF）and wavelet analysis. The results showed that the climate-productivity kept decreased over Chinese Loess Plateau. The west, east and south part were identified as highly related regions, where strong temporal variability of the climate-productivity existed. By using wavelet analysis, the 2-4 years period was more remarkable. The changes of direction and intension of the elimatepro- ductivity were evident within 4 years. The climate-productivity variation amplitude was bigger in the south than that in the north of the plateau. The sensitivity of the climate-productivity variation was in the central north of the plateau. The variation information of the climate-productivity flowed from the central east area to edge of the plateau.