Study On The Environmental Evolvement Of The Upriver Wudinghe And Adverse-Resistant Plants Resources And Its Utility In Ecology Reconstruction

This dissertation evolves from the nation key project "The experimental area construction of Graceful Mountains and Rivers and researches of important science and technology problems in different ecosystem regions in the northwest of China." It is the continuance of early study achievements and divisional researches. With the instance of Maowusu sandlot of upriver Wuding river, based on the analysis of its environmental evolvement character and main problems, in the aspects of plant source study, structure and category analysis and comparative botany, we study plants source, essential character and adaptive disposition and protection ways of typical native plants.The research work is based on the following aspects:1) Analysis of native environment evolvement character;2) Adaptive plants source study, genus composition character and category analysis;3) Comparative study of Botanical and anti-reverse natures of native typical plant Salicaceae4) Protection and treatment studies of native adaptive plants sterilization.Through different studies and technical methods of spot survey, discussion and visiting, spot observation, plants collection, investigation and comparison, indoor experimental analysis and study, data collection and analysis,and in the aspects of native environment evolvement character and problem, native plants adapting to and protection mechanisms from sandlot environment, desertification prevention and treatment and restoration of vegetation , we reach the conclusion as follows:(1) Environmental vicissitudes and evolvement rules of upriver of Wuding river (Maowusu Sand) clues to the essential native environment character, concluded as "cold, drought, wind, sand and salt ".In this environmental back ground, the serious environmental problem faced by this area is "sand moves forward and men backward; rainstorm causes the lapses of water and soil; frail environment results in species being in severe danger".(2) By investigating and compiling native adaptive plants source catalogue (refer to enclosure < Seed Plant Catalogue of Maowusu Sand near Upriver Wudinghe >), we study genus composition character of native adaptive botanical source. It shows most native plants belong to the North Temperate Zone distribution; the study of native plants category character indicates its multilayer significance of ecological transmission and the long time history evolvement of category composition. Other categories distribution plants ingression into native district depends on adaptations to desertification environment and long term settlement, severance, development and stability. It provides direct scientific direction to adaptive plants seeds choose of ecological environment and Graceful Mountains and Rivers Project constructions.(3) The distribution of natural Populus diversifolia is discovered and reported in this botanical source survey, which is the first in the whole Maowusu desert. To some extent, it would be living fossil and biological indication for studying Tongwancheng and its surrounds evolvement. It enlarges botanical distribution area of Populus diversifolia and is of important reference value to studying environmental evolvement of Tongwancheng site surrounds, ecological treatment and vegetation recurrence of drought and semi-drought districts.(4)Through comparative botanical study, we conclude as follows: the prominent anti-drought nature of native S.flarida in adversity explains its excellent adaptation to drought and adversities and a suitable sand pioneer plant; As an important hungriness and riverside plant, Populus diversifolia expressed strong surviving and multiplying botanical characters through long time evolvement and biological adaptation in drought sand and climate. The anti-adversity character of S.matsudana and favorable native hydrological promise low investment, fast effect, considerable ecological treatment and economic values for vigorous development of S.matsudana. (5) Here proposed several possible sterilization ways, such as building typical adaptive plants sterilization demonstration garden, popularizing sand industrial environment district of important adaptive plants,(taking Hanliu economic forestry district, sand officinal plant environmental industrial district, sand sight environmental industrial district as examples.)and building natural protection zone and national sand plant parks.(6) Lastly, from theoretical discussion and plan of long term sustainable operating mechanism of native plants sterilization protection and treatment, we proposed constructing and perfecting long term sustainable operating mechanism of native plants sterilization protection and treatment. Proceeding with inter-knitting and inter-supporting aspects of managing and organizing mechanism, compensation mechanism, afterward industry chain plan and circulation development mechanism, innovation mechanism and publication mechanism, a complete set of quinaritarian operating mechanism is build.