Pedosphere 19(6): 756--764, 2009
ISSN 1002-0160/CN 32-1315/P
©2009 Soil Science Society of China
Published by Elsevier B.V. and Science Press
Fuzzy synthetic evaluation of wetland soil quality degradation: A case study on the Sanjiang Plain, Northeast China
WANG Jian-Hua1,4, LU Xian-Guo2, JIANG Ming2, LI Xiao-Yan1,4 and TIAN Jing-Han3
1 State Key Laboratory of Earth Surface Processes and Resource Ecology, Beijing Normal University, Beijing 100875 (China)
2 Northeast Institute of Geography and Agricultural Ecology, Chinese Academy of Sciences, Changchun 130012 (China)
3 Hebei Cangzhou Teachers College, Cangzhou 061001 (China)
4 College of Resources Science and Technology, Beijing Normal University, Beijing 100875 (China)
      Wetland soil quality degradation caused by large-scale agricultural reclamation on the Sanjiang Plain of Northeast China has been widely reported. A relative soil quality evaluation (RSQE) model and a projection pursuit evaluation (PPE) model based on real-coded accelerating genetic algorithm were introduced to evaluate quality variations in top layers of the main wetland soils on the Sanjiang Plain in 1999 and 2003, respectively. As soil quality degradation boundaries were vague, this study established two fuzzy synthetic evaluation (FSE) models based on the original data and criteria used in the RSQE and PPE models. The outputs of the two FSE models were obtained by choosing two fuzzy composite operators M (∧, ∨) and M (·, ⊕). Statistical analysis showed that the results of the FSE, RSQE, and PPE models were correlated. In particular, outputs of the FSE model using M (·, ⊕) were significantly correlated with those of the RSQE model with r = 0.989 at P < 0.01. Compared with RSQE and PPE models, the FSE model may be more objective in showing soil quality variations and was closer to the natural situation, showing the feasibility and applicability of the FSE model in evaluating soil quality degradation. However, the choice of composite operator was of critical importance. The study of wetland soil quality degradation on the Sanjiang Plain was of scientific and practical significance for protection and management of soils and for sustainable development of agriculture in this area in the future.
Key Words:  fuzzy composite operator, model, soil protection and management, sustainable development of agriculture
Citation: Wang, J. H., Lu, X. G., Jiang, M., Li, X. Y. and Tian, J. H. 2009. Fuzzy synthetic evaluation of wetland soil quality degradation: A case study on the Sanjiang Plain, Northeast China. Pedosphere. 19(6): 756-764.
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