Study On Integrated Propagation And Afforestation Techniques Of Drought-Tolerant Species And Afforestation In Chaidamu Area

Being one of the four inland basins in China, Chaidamu Basin is named as Treasure Bowl with a total area covering 256,660 km2, accounting for 36.58% of total land area in Qinghai. Chaidamu Basin bears a feature of dry and less rain. Its annual precipitation is 16.7-487.7 mm with average evaporation in 1,353.9-3,526.1 mm annually, over 5 to 195 time of the annual precipitation. Belonging to arid area, its vegetation is dry and extremely dry grass areas, which are distributed in Gobi and desert. Vegetation in this area bears an genus of anti-reverse, which is a valuable species for vegetation research. Study and research of local species can help us learn about sand area afforestation and some economic species, which later will facilitate the development of sand consolidation and environment protection in West China.In recent years, eco-environment construction is on-going, and the scale of afforestation is increasing. However, the special physical condition in Chaidamu Basin leads to single tree species structure and low survival rate. The existing tree species are not suitable for the eco-construction in Chaidamu Basin any more. The species with better anti-reverse feature must be found to support the eco-construction in Chaidamu Basin. Fortunately, more options are opened for us in this Basin. Thus, artificial way of breeding with some afforestation techniques to help the eco-construction in Chaidamu Basin is the first priority.This study of the research paper is mainly on the special features of sand vegetation according to the vegetation type and community structure, and to find more suitable species for artificial breeding trials in order to solve the technical problem of anti-dry species afforestation, and further up the eco-protection of Chaidamu Basin.There are three components of the study: Selection of better local anti-dry species, trials of species breeding and anti-dry species afforestation technique trial, summarized the afforestation technology.Achievements and some new findings from the study: Some better local anti-dry vegetation is found, including Nitraria tangutotum. which is of great anti-dry; Poplar, Chinese Tamarisk, Ceratoides latens, Salsola arbuscula Pall., Zygophyllum xanthoxylum, Calligonum mongolicum, Haloxylon wnmodendron, which are of strong anti-dry, and Ephedra przewalskii Stapf and Kalidium cuspidatum, which are of anti-dry; Secondly, main techniques of dry area tree breeding in Chaidamu Basin are found. A production technical study was carried out on Calligonum mongolicum, Haloxylon wnmodendron, Ceratoides latens, Kalidium cuspidatum andpoplar; finally, a summary of afforestation technique for Chaidamu Basi is developed, which gives a reasonable division of land site, and defines different modes and densities different land sites. This study has laid a substantial foundation for the eco-construction in Chaidamu Basin, even the entire western area. The outcomes of the study are worthwhile of dissemination.