RESOURCES AND ENVIRONMENT IN THE YANGTZE BASIN >> 2008, Vol. 17 >> Issue (1): 36-36.

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RESPONSES OF REGIONAL SOIL QUALITY TO LAND USE CHANGES—A CASE OF N ELEMENT

ZHANG Jian,CHEN Feng,PU Lijie,PENG Buzhuo   

  • Received:1900-01-01 Revised:1900-01-01 Online:2008-01-20

Abstract:

Land use change may influence a variety of natural and ecological processes,including soil nutrient,soil moisture,soil erosion,land productivity and biodiversity.The major problem faced by the sustainable development of the former Xishan region in the Yangtze River Delta was the harmonious development of economy and environment.In recent years,the ecoenvironment of the region has become vulnerable due to the high intensity of human activities and increase of population.In this paper,taking Xishan region as the study area,a new database of total nitrogen and available nitrogen in soils of the region was established by laboratory analysis on soil samples collected in 2005 and by comparison with relative data of 1982.The spatialtemporal variation of N element in former Xishan City between 1982 and 2005 was analyzed through application of geostatistics combined with GIS.Independent geostatistics showed that all nitrogen decreased 0.16 g/kg,and available nitrogen decreased 7.63 mg/kg; semivariogram model indicated that the model for all nitrogen and available nitrogen in former Xishan City remain unchanged,whereas the ratio of Nugget/Sill and the correlation threshold changed significantly.The results of Kriging interpolation indicated that,the spatial distribution patterns of total nitrogen in 1982 and available nitrogen in 1982 and 2005 were simple,and the pattern of total nitrogen was rather complex in 2005; total nitrogen content decreased during these years,and its spatial variation changed significantly; the change of available nitrogen content was little with a significant change of spatial variation.

Key words: land use change, all nitrogen, available nitrogen, former Xishan City

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