| Study on dynamic land-use changes and driving forces is a front and hotspot problem to geography and ecology, mainly researched the influence and function of natural driving forces and human activities to the Earth surface layer system. Land use and Land cover not only lead to global changes, but also constrain the sustainable development of regional social economy. With the rapid development of industrialization and the rapid increase in population, human pressure on land resource increasingly larger, so it's very important to in-depth analysis the changes of land use structure and driving forces, which can provide a scientific approach to rational planning of land use; meanwhile we can recognize correctly the internal factors of land use.The southern loess plateau is one of important geographical areas in our country, whose land resources were damaged seriously. So it's important and urgent to research land use resources changes in this region. This study area is in the sub-humid warm temperate climate zone, which has complex terrain, poor water resources, variety of vegetation types and mainly covered with yellow soli.With the support of GIS and RS, supervised classification of the southern loess plateau in 1980.1985.1996.2000.2005 Landsat TM images were done combined with DEM,political map and a lot of relevant information, which got specific distribution of cultivated field,woodland,lawn,waters,construction land and unused land. Based on the climate data,terrain data,hydrological data and soil data, analysis were done on spatial difference of natural factors in the whole study area, then selected a typical district—south of Yan River Basin, and made a further analysis on natural driving forces of land use from the time scale.For a typical district, space analysis was made on land use change from 1980 to 2005 at first, including land use extent,land use dynamic degree,land use level and land use change conversion matrix; Then correlation analysis was done on natural driving forces and area change of various land use types, and through analyze paper draw following meaningful conclusions while being above-mentioned:(1) Climate factor:It's no obvious correlation between cultivated field and climate factors; humidity,sunshine hours and precipitation are driving force to woodland changes; temperature and precipitation are mainly driving force to lawn; sunshine hours and wind velocity are mainly driving forces to waters; precipitation is mainly driving forces to unused land.(2) Terrain factor:cultivated field,waters,unused land and construction land mainly in the low elevation and small slope district; Lawn and woodland mainly in the incline slope,elevation of 1000-2000 meters above sea level district. So terrain factor is one of natural driving forces to determine the land use distribution of southern loess plateau.(3) Water factor:obtained through the buffer analysis:cultivated field, lawn and construction land are most sensitive of the waters distribution, so the waters distribution is one of natural driving forces to determine the land use distribution of southern loess plateau.(4) Soil factor:It's no obvious correlation between changes in soil types and land use change froml980 to 2005, so soil types are unimportant to determine the land use distribution of southern loess plateau for nearly 25 years.The innovation of this paper is:analysis were done on spatial difference of natural factors and land use distribution in the whole study area at first from macroscopic scale, then through selected a typical district made a quantitative analysis on natural driving forces of land use from the time scale. |
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