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Xinjiang University (2010)

Study On Soil Salinization And Ecologic Effects In The Typical Oasis Of Arid Regions

王雪梅;Wang Xue Mei

Titre : Study on Soil Salinization and Ecologic Effects in the Typical Oasis of Arid Regions

Auteur : 王雪梅;Wang Xue Mei

Grade : Doctoral Dissertation 2010

Université : Xinjiang University

Résumé partiel
Soil salinization is a major type of land desertification and degeneration in the worldwide today. Soil salinization is also a major constraint and obstacle of oasis’ agricultural sustainable development in arid and semiarid areas, and poses the enormous threat stably to the oasis ecosystem. Therefore, it has the vital realistic significance to evaluate accurately and prevent scientifically soil salinization in order to promote oasis’agricultural development and regional sustainable development in arid areas.This study selected the delta oasis of Weigan and Kuqa River as the typical research area, which has a long-term researched foundation in Xinjiang’s arid area. Under the theory of landscape ecology and sustainable development, used different periods’remote sensing satellite data and long-term field measuring data as the basic data sources, used spatial information technology (RS, GIS, GPS), statistics technology and landscape ecology method, to research synthetically the change of soil salinization and ecologic effects in the delta oasis of Weigan and Kuqa River. Grasping scientific the change rule of the soil salinization and eco-environment in different spatial and temporal scale which could provide scientific basis for the regional eco-environment construction and land sustainable development. At the same time, studying on the change of soil salinization and ecologic effects in the delta oasis of Weigan and Kuqa River is a regional respond to the change of global. Through the research of the regional soil salinization, this thesis indicates some major conclusions as the following:1) Taking the 1989’s,2001’s TM/ETM+ and 2007’s ALOS satellite data as the basic information sources, launch the research of soil salinization change trends. On the foundation of data basic, using the methods of the geography model, transfer matrix, the LUCC model to analysis the change of soil salinization and explored the quantitatively the distribution and the change trends of soil salinization. The results indicate the areas of severely soil salinization presented the obvious decreased trends in the delta oasis of Weigan and Kuqa River from 1989 to 2007 ; the areas of moderately soil salinization present the fluctuation up and down, but the whole areas was decreased ; the slightly soil salinization presented the obvious decreased trends, while the areas of non-salinization showed the trendy of dramatically raise. At the same time, union salty chronometers space interpolation result analysis, the salinized soil is mainly distributed in the lower reaches of the Weigan and Kuqa River, the northern margin of the Tarim River, the west-southern, the southern, and the eastern, the east-southern of oasis. The soluble salt by the chloride primarily, and is accompanied by the few sulfate-chlorination category of things. The distributions of salinized soils are stripe inside oasis, while are slices in the marginal oasis. The main distribution trendy displays the transfer from inside to outside of oasis.2) On the foundation of analysis the satellite data (TM/ETM+ and ALOS), established the spatial and temporal data basic of LUCC in the delta oasis of Weigan and Kuqa River by the combination of RS and GIS. On the foundation of data basic, using the methods of the geography model, transfer matrix, the LUCC model to analysis the change of LUCC, reveal the distribution and change laws of LUCC quantitatively. The results indicate:the whole tendency is the surely increasing of oasis areas in the delta oasis of Weigan and Kuqa River from 1989 to 2007.The type of LUCC showed the continued increasing of the human living region, and the decreased of the natural forest, grass and soil salinization.3) Taking the data of field investigations as the brief data sources, analyzed the spatial distributions of the characteristics of soil salinization.

Mots clés : Typical Oasis of Arid Regions; Soil Salinization; Ecologic Effects; the Delta Oasis of Weigan and Kuqa River;

Présentation (CNKI)

Page publiée le 21 avril 2013, mise à jour le 2 mai 2018