Life History Strategies Of Populus Euphratica Oliv. Population In The Ejina Oasis Of Inner Mongolia

Desert occupies a special position in the Earth global ecosystem and has a great influence on the global environment. It occupies a great area in the world; its environmental condition is extremely serious and frail. Oasis is not only the most important part of desert ecosystem, also the most sensitive region. The fate of oasis has a significant impact on the neighbor regions and even to a larger extent. Influenced by desert arid climate, desert riparian forest made up by Populus euphratica Oliv. is non-zonal vegetation as well as the main part of the Ejina oasis of Inner Mongolia. Due to the undeveloped regional economy and the lack of understanding on the function of Populus forest on maintaining eco-balance in desert region, Populus euphratica forest suffered havoc, its distribution area reduced sharply, and the withering phenomenon is very serious.As the behavior or process of generating new units, reproduction is an important phase in the whole biological life history, the most basic behavior of regeneration. It is also one of the key issues in the population forming, developing and evolution. Being an important trait of life history, reproductive strategy is a self-organizing process in which plants adapt their habitat environment through the best resource distribution pattern. The adaptive object of reproductive strategy is environment; its final aim is the sustainable survival and reproduction of species. From 1990's to the present, reproductive strategy, life history, the relationship between behavior and the cycle of population density as well as evolutionary stability of behavior strategy become the main research field in the reproduction ecology and behavior ecology in the world.The object of this paper is Populus euphratica Oliv., which is the dominating species in desert riparian forest. Using the theory bases of floristic taxonomic system of Engler, the of vegetation distribution, and ecological strategy of population, as well as the principle and research methods of phenology and reproductive ecology, through the masterstroke of...