Dynamics of Climate-productivity over China Loess Plateau

Weather datum of 51 stations during 1961～2000 in China loess plateau were studied by using empirical orthogonal function(EOF),rotated empirical orthogonal function(REOF),expand empirical orthogonal function(EEOF),complex empirical orthogonal function(CEOF) and wavelet analysisy,respecfively,and the spatial and temporal variations of climate-productivity over China Loess Platean were investigated.The results showed that the climate-productivity kept decreased over China loess plateau.Three divisions,the west,east and south parts were identified,showing strong temporal variability.The 2 a～4 a period was more remarkable.The changes of direction and intension of the climate-productivity were evidence in 4 a.Moreover,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 north-center at the plateau.The variation information of the climate-productivity flowed from the east-center area to edge of the plateau.