杨树生长快、品系多、效益高,扩大杨树栽培面积是扭转木材短缺和供需矛盾的重要途径。针对该区自然特点和地瘠、沙重、低产问题,我们以适地适树适品系、适水肥、混交和密度等丰产技术为中心,布点试验,研究其生理生态与速生丰产的相关性,为造林服务。一、根据杨树生理生态指标,因地选用优良速生品系造林,是实现林木速生优质丰产的物质基础。为顺应杨树品系的生理和生长规律,运用培育技术,使品系内在因子与环境需求的统一,立木与立地、自然生长与人为促进有机结合,才能使速生良种、生理 Poplar growing fast, more lines, high efficiency, expanding poplar cultivation area is an important way to reverse the shortage of timber and supply and demand. In view of the natural characteristics of the area and the problems of barren, sand and low yield, we focused on the suitable tree species, water and fertilizer, mix and density and other high yield techniques as the center, the distribution of the test to study its physiological and ecological fast-growing yield relevance, Afforestation services. First, according to the physiological and ecological indicators of poplar, because of the selection of excellent fast-growing strains of afforestation, is the material basis for achieving fast-growing and high-yielding forest trees. In order to conform to the physiological and growth rules of poplar strains, using cultivation techniques to integrate the internal factors and environmental requirements of the strains, establishing the organic combination of stand and site, natural growth and man-made promotion,