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Study on Soil Salinization in the Western Plain of Jilin Province Based on GIS

Author: ZhangDianFa
Tutor: LinNianFeng
School: Changchun University of Science and Technology
Course: Hydrology and Water Resources
Keywords: Western Plain of Jilin Salinization of the land Cause Analysis The ecological geological environment system The land salinization of risk Evaluate GJS RS Spatial Analysis Artificial Neural Networks Coupling Technology Salinization of land resources Improve Remediation Protection Sustainable use of
CLC: S156
Type: PhD thesis
Year: 2000
Downloads: 633
Quote: 17
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Abstract


Authors participated in the mentor, Professor Lin Nianfeng presided the National Natural Science Foundation Jilin two agro-ecological geological environment and sustainable agricultural development mechanism \It is the region's major ecological and geological environmental problems, salinization of land resources to be studied, governance, development and use of selected land salinization as the direction of this study. This article using RS, GIS and mathematical model coupling causes of land salinization in the agricultural ecological environment in large systems, the quantitative relationship between the ecological the geological environmental factors and land salinization, agricultural production and internal environment and agricultural production in the external environment combined work out the salinization of land resources development and utilization of the program. In order to determine the possibility of further expansion of the western Jilin land salinization, and effective use of salinization of land resources to provide a scientific basis, first proposed the concept of land salinization risk and the risk of salinization of the land of the Western Plain of Jilin degree is evaluated quantitatively. The formation process of the western Jilin land salinization, irrational human activities results superimposed on the basis of the fragile eco-geological environment. Fragile eco-geological environment provides an objective basis for the occurrence of land salinization, so, on the climate, geology, geomorphology, hydrology and hydrogeological factors in numerous ecological geological environmental factors of the most significant impact on land salinization, in particular the impact of the freeze-thaw action on land salinization, has long been experts in various fields are ignored, the study found that the \explosive salinization laid the foundation, but also for the depth of water table is greater than the critical depth region of salinization, land salinization occurs to find a credible basis. Irrational human economic activity trigger and accelerate the process of land salinization. Throughout the macro research at home and abroad predecessors salinization of land, the influencing factors of the use of qualitative methods of land salinization single factor analysis. Traditional research methods are difficult to meet the requirements of the the land salinization risk of quantitative evaluation. GIS and spatial, quantitative, timing, efficiency, ease of space-time monitoring and data updates fast, and can meet the above requirements. GIS and RS technology and mathematical models coupled to study land salinization is an innovative attempt of this article. By RS, information about the types and their spatial distribution of land salinization; using GIS spatial localization and quantification of ecological and geological environmental factors, spatial information of land salinization and ecological geological environment of the various factors affecting the spatial overlay analysis, the quantitative relationship between the various factors affecting the land salinization, GIS and gray relational model, fuzzy clustering model, artificial neural network model coupled with gray relational model to determine the main influencing factors, the use of fuzzy clustering model to extract training samples, the use of artificial neural network model to evaluate land salinization risk. As can be seen from the results of the evaluation of the western Jilin land salinization risk, the western Jilin land salinization background, less prone to salinization of the land area of ??only 22.12% of the total land area, mainly in hilly and dune ridge nuchal; prone to salinization of the land area of ??53.97%, located in the central region of the Western Plain of Jilin, especially low-lying, Diving

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CLC: > Agricultural Sciences > Agriculture as the foundation of science > Soil > Soil improvement
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