Evolvement of Climate-productivity over Chinese Loess Plateau

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 climateproductivity 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.