Pedosphere 15(6): 797--804, 2005
ISSN 1002-0160/CN 32-1315/P
©2005 Soil Science Society of China
Published by Elsevier B.V. and Science Press
Space-time variability and prognosis of soil salinization in Yucheng City, China
YANG Yu-Jian, YANG Jing-Song, LIU Guang-Ming and YANG Xiao-Ying
Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008 (China). E-mail: yyjyp2004@21cn.com
ABSTRACT
      This research used both geostatistics and GIS approach to compare temporal change of soil salt between 1980 and 2003, to analyze the spatial distribution of surface soil salt, to developed methods for predicting soil salinization potential based on recent improvements to the Dempster-Shafer theory, and to develop probability maps of potential salinization in Yucheng City, China. A semivariogram model of soil salt content was developed from the spherical model, and then employing kriging interpolation the spatial distribution of salt content in 2003 was obtained utilizing data from 100 soil sampling points. Potential salinization distribution was mapped using an approach that integrated soil data of the second general survey in 1980 in Yucheng City, which included groundwater salinity, groundwater depth, soil texture, soil organic matter content, and geomorphic maps. With the support of Dempster-Shafer theory and fuzzy set technique the factors that affected potential soil salinization were characterized and integrated;and then soil salinization was predicted. Finally a prognosis map of potential salinization distribution in the research area was obtained, with higher probability values indicating higher hazards to salinity processes. The distribution of the potential soil salinization probability was a successive surface.
Key Words:  Dempster-Shafer theory, GIS, kriging interpolation, prognosis, soil salinization
Citation: Yang, Y. J., Yang, J. S., Liu, G. M. and Yang, X. Y. 2005. Space-time variability and prognosis of soil salinization in Yucheng City, China. Pedosphere. 15(6): 797-804.
View Full Text



Copyright © 2024 Editorial Committee of PEDOSPHERE. All rights reserved.
Address: P. O. Box 821, 71 East Beijing Road, Nanjing 210008, China    E-mail: pedosphere@issas.ac.cn
Technical support: Beijing E-Tiller Co.,Ltd.