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Scientia Silvae Sinicae ›› 2009, Vol. 12 ›› Issue (4): 7-13.doi: 10.11707/j.1001-7488.20090402

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Landscape Dynamics in Beitun of Irtysh River Basin, Xinjiang

Jing Xuehui1,2,Zang Runguo2,Cao Lei1,Guo Zhongjun3,Chen Dongli4   

  1. (1. Chengde Bureau of Environmental Protection, Hebei Province Chengde 067000;2. Key Laboratory of Forest Ecology and Environmentof State Forestry Administration Research Institute of Forest Ecology, Environment and Protection, CAF Beijing 100091; 3 .Xinjiang Academy of Forestry Urumuqi 830000; 4. Dujiangyan Branch, Sichuan Agricultural University Dujiangyan 611830)
  • Received:2007-03-29 Revised:1900-01-01 Online:2009-04-25 Published:2009-04-25

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Abstract:

The landscape pattern and dynamics in Beitun of Irtysh River Basin in Xinjiang from 1972 to 2000 were analyzed by using RS and GIS in integrating with the landform maps, vegetation maps and field investigations, based on the theory of landscape ecology. The remote sensing image data included MSS, TM, and ETM+. Quantitative indices of landscape pattern, including patch numbers, mean patch size, mean patch shape index, mean patch fractal dimension, Shannon diversity index, and Shannon evenness index, were chosen to analyze the landscape pattern changes. The results showed that desert was the matrix of the landscape inBeitun of Irtysh River Basin in the 28 years. During the period, the farmland area percent increased 9.62%, the desert area decreased 11.75%, the residence area increased 0.15%, the riparian forest area decreased 0.44%, and the wetland area decreased 1.06%. The landscape pattern analysis results showed, in the 28 years the patch number increased and the mean patch size decreased, which indicated that landscape in Beitun of Irtysh River Basin in 2000 was more fragmentized than the landscape in 1972. Up to 2000, the landscape in Beitun of Irtysh River Basin had many small patches. Both the mean patch shape index and mean patch fractal dimension index had a rise trend from 1972 to 2000, which showed that landscape patch shape was becoming more complex in Beitun of Irtysh River Basin. The Shannon diversity index behaved a rise trend from 1972 to 2000, which explained that the landscape heterogeneity decreased among the landscape types in Beitun of Irtysh River Basin. The Shannon evenness indexhad a similar trend, which showed that landscape types in Beitun of Irtysh River Basin distributed more evenly. Analysis of the transition matrix of landscape types in Beitun of Irtysh River Basin from 1972 to 2000 indicated that riparian forests were the most unstable type, and the main transition direction was grassland, secondly was farmland. The reason for riparian forest transferred to grassland and farmland would probably be due to the increased population and livestock numbers, the policy contradiction between graze and forestry management, extracting and intercepting water and so on.

Key words: landscape pattern, landscape dynamics, indices of landscape pattern, Irtysh R iver Basin