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Northwest Normal University (2009)

The Study Of Succession Of Potential Vegetation In Arid Area Of Northwest China

李飞; Li Fei

Titre : The Study of Succession of Potential Vegetation in Arid Area of Northwest China

Auteur : 李飞; Li Fei

Grade : Master’s Theses 2009

Université : Northwest Normal University

Résumé
The current global climate change increasingly prominent, many natural systems are being affected by regional climate change, especially by the effects of increasing temperature, to accurately predict climate change and the possible impact of climate change on ecosystems has become the main research goal of International Geosphere and Biosphere Program (IGBP). The potential vegetation, as a final state of succession which achieves the balance with its site, is the most stable and mature climax vegetation type at the site without human interference, and is the trend of the regional vegetation development. The study of potential vegetation can substantially reveal the impact of climate on the changes of the vegetation patterns. It is the starting point of the vegetation-environmental classification and relationship study, as well as the key point of the global change and terrestrial ecosystem study.Arid area of northwest China hiding inland, far away from the oceans, precipitation is very scarce and sunshine is very strong, dry continental climate is main characteristic in this area. Natural vegetation is sparse in this area and coverage of surface vegetation is low. The harsh condition of climate and environment lead to the lower production capacity, the lower biological diversity and the less capable of self-regulation of ecosystem so that ecosystems showed extreme vulnerability this particular area. In addition, the excessive development of land and overloaded use make the already fragile natural ecosystems constantly shrinking and degradation, so that the fragile natural ecosystems gradually develops toward reverse badly aspect. The study of vegetation background in arid area of northwest China has become guidance’s and basic work of ecological environment construction in the western. Potential vegetation, as a final state of succession which achieves the balance with its site, is the most stable and mature climax vegetation type at the site without human interference, and is the trend of the regional vegetation development. It has great guiding significance to the rehabilitation and reconstruction of vegetation in such region.Because of the monsoon climate in China and the Qinhai-Tibet Plateau with the name of the world’s "third pole", the special relationship between the vegetation and the environment can not be reflected effectively by the international general model, and there are many problems in using and modifying the foreign models. Therefore, it is much necessary to select appropriate models according to the study area and the status of the region. Based on the methodology of integrated sequence classification and the support of GIS methods, this paper analyzed study area’s climate change and succession law of potential vegetation in arid area of northwest China with the 1961-2005 annual precipitation data of 119 meteorological observatories and the 1961-2005 > 0℃annual accumulated temperature data of 115 meteorological observatories of meteorological bureau of Gansu province, the following Conclusions have been obtained : (1) In the arid area of northwest China, due to climate change, potential vegetation arisen complicated process of succession. In the transformation characteristics and quantity of potential vegetation types, the distribution area of potential vegetation shows three kinds of characteristics : reduced steady, increased steady and changed fluctuant. In geographic distribution pattern change and the development direction of potential vegetation types, the main areas with obvious succession are Turpan basin, the western Hulunbeier plateau and northern Xilinguole plateau, Hulunbeier plateau,

Mots clés : Arid area in northwest China; Potential vegetation; Succession; Global Climate Change; Integrated sequence classification;

Présentation (CNKI)

Page publiée le 22 avril 2013, mise à jour le 14 février 2018