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THE RELATION AMONG ECOLOGICAL FACTORS AND DIAMETER GROWTH OF PLATYCLADUS ORIENTALIS IN THE SOUTH OF NORTHERN SHAANXI PROVINCE PRELIMINARY STUDIES ON THE STRUCTURE AND DYNAMICS OF PLATYCLADUS ORIENTALIS POPULATION AT THE FOREST AREA IN LOESS PLATEAU OF NORTHERN SHAANXI PROVINCE Analysis and assessment of heat resource for winter wheat northward moving during 1961-2001 in Shaanxi Province Spatio-temporal variations of vegetation cover in northern Shaanxi Province under the background of ecological restoration. Photosynthetic mechanisms of northern boundary formation of Quercus wutaishanica forest in Loess Plateau of northern Shaanxi Province. Study on the Cenozoic Flora and Flora Evolution of the Loess Plateau of Northern Shaanxi Province