Affiliations: Department of Geography, South China Normal
University, Guangzhou 510631, China. E-mail: NWSUN@21cn.com | Cold and Arid Regions Environmental and Engineering
Research Institute, Chinese Academy of Science, Lanzhou 730000, China
Abstract: In this paper, the relationship among land productivity, population
pressure and the fluctuation mechanism of ecotone is analyzed, taking counties
and banners of southeast Inner Mongolia plateau as an example, which is the
most fragile part in the farming and husbandry interleaving belt of north China
due to its severe desertification degree and low level of economic development.
The C_v for the total output value of agriculture decreases from southeast to
northwest, with the same rule as which the overloading population cumulated
distributes, and both indicators have close relation with the high linear
coefficient of 0.83. These reveal the fluctuation mechanism for Ecotone:
fluctuation of the level of economic development is a scientific and practical
measure both to weakness degree and to instability of Ecotone, because it is a
synthesized response to the variation of climate as well as irrational land
uses, which reinforce and magnify the fluctuation. In detail, the heavier the
population overloading, the severer the grassland reclamation, the stronger the
dependence of regional productivity on rainfall, the lower the level of
economic development, the rougher the fluctuation of ecotone, but the weaker
the PRED system.
Keywords: fluctuation mechanism, weakness degree, population overloading, land productivity
