Dynamic Changes On The Landscape Structure Of Hunshandake Sands And Analysis On It's Forming Factors

Hunshandake sands which is the important component of natural ecological landscape hell in Mongolia tableland, has unique spatial distribution pattern, obvious frangibility and evolvement rule in ecology, and has important function in environment protection. The data can be collected enormously, quickly and precisely under the support of RS and GIS. The applicant of landscape ecology provides us with an efficient way on quantitatively monitering landscape current and dynamic situation.In this paper, we saw TM image from late 1980s to 2000 -as data sources and using GIS data pnocessing function got landscape spatial attributive database. By doing so, analyze the landscape structure and its dynamic changes with the fundamental theories and methods of landscape ecology. As a result, the desertification is serious, the area of grassland and immobile dune is obviously on the decrease. In counter the area of semi-immobile dune and mobile dune is on the increase.On the landscape scale, the lees diversity and equality of landscape indicates thata landscape-s make-up becomes simpler. In the meanwhile, the more superiority indicates that the dominance and influence of the components (semi-immobile, mobile ) which are the main make-up of the landscape are increasing. From this we can see that the landscape develops toward desertification.The break up of landscape indicates that the influence of human activities on landscape is increasing.Analyzing the forming factors of dynamic changes in this area, we can see that temperature increase and rainfall decrease are the basic and background conditions of development of desertification, overgraze is the main causes, other causes such as misuse denudation, hew, estrepement and herb......give a hand to it.At last, put forward some countermeasures for how to recover and improve the landscape ecology in Hunshandake sands.