Discussion On Temporal-Spatial Variability Of Soil Chemical Properties And Evolvement Of Landscape Pattern In The Luo Hilly Riparian Zone

Based on the basic theory of landscape ecology and the technology of 3S, this paper explores the relationship between landscape pattern and soil quality change of the riparian zone in Luo River hilly region from 1987 to 2008, the results are as follows:The land use of the Luo River hilly riparian zone are intensive, bare land and unused land are little, cultivated landscape is landscape matrix, most of the land changed to construction land, dramatic changes in the pattern; Landscape area of the waters increased, little change in the pattern; Landscape area of land for construction has increased year by year, highlighted the phenomenon of landscape patch merged; Area of woodland and grassland landscape in general increase in plaque area did not change significantly. Landscape patch shape changes the rules; a low degree of fragmentation, the system changes the structure of the complex differences between various types of landscape to reduce the proportion. From the view of landscape the characteristics of landscape pattern in this region is gradually reasonable and stable.The soil of the Luo River Basin Riparian hills is alkaline soil, the soil pH of the vertical bank are the Parabola, the bank is the starting point, the more far away from the rivers, the more soil pH increased; Soil organic matter and available phosphorus content in the northeast are high than in the Southwest, K content in soil of the north shore is higher than the south bank; Compared with 1978 , the soil pH value is Reduce, organic matter and available phosphorus are increases, the difference of the soil organic matter and the available phosphorus are increased.From 1987 to 2008, the pH of arable land into woodland is decreased, the organic matter reduced from arable land into the waters, soil available pH increased form the arable land into grassland and water content of, the average levels of organic matter increased from arable land to woodland and grassland; waters to farmland, soil pH in woodland and grassland decreased, and soil available K decreased; water turned into arable land, soil available pH and organic matter content were increased.With the landscape diversity index increased, landscape fragmentation index and landscape dominance index decreased, soil pH, soil available K content decreased, while soil organic matter and soil available pH content increased. Compared to 1987, except the landscape of waters and other landscape, the pH decreased soil available P in the arable land and grassland landscape in the content increased, K in the various landscape types all decreased.We must optimize the internal landscape, protect the of cultivated landscape, and reasonably plan the land use of forest landscape and building construction, optimize landscape structure and landscape features; We should make great effort in farming and fertilization, leveling, irrigation and water conservancy, reforestation and soil improvement.