The TUPU Analysis of Land Use Pattern in Xinkai River Basin

In this paper,the research is conducted based on the geographic information TUPU analytic methods and Markov model of space probability.With the support of ARC/INFO software,this paper has compounded a series of varying TUPU of the land-use pattern by using spatial data covering four periods(1969,1979,1992 and 2001) in the Xinkai River basin.We can comprehend the changes of land-use pattern in the Xinkai River basin through the TUPU.The result shows that great changes have taken place on the land-use pattern in this basin during the past 33 years.The farmland has a net increase of 1357.2 km2(exceeding 32% of the total basin),and most ofit was converted from grassland,sandy soil,marsh and woodland.The changes of sandy soil somewhat oscillated.The area of sandy soil accounted for less than 23% of the total basin area.Although the sandy soil tended to decrease on the whole,the desertification of grassland and farmland is still serious in this basin.The grassland has decreased greatly.It has a net reduction of 1582.6 km2 from 36.2% to 18.5% of the total basin area.The main reasons are summarized in three respects:first,grassland has been cultivated into farmland;second,grassland has degenerated into sandy soil,marsh and saline land;third,grassland has been transformed into plantable woodland.The residential land and saline land show a decreasing trend while the wetland and woodland present an increasing trend.