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Scientia Silvae Sinicae ›› 2011, Vol. 47 ›› Issue (7): 27-35.doi: 10.11707/j.1001-7488.20110705

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Dynamically Monitoring Vegetation Cover by Remote Sensing in the Typical Salinization Region of Xinjiang: A Case Study in Delta Oasis of Weigan and Kuqa Rivers

Zhang Fei1,2, Tashpolat·Tiyip1,2, Ding Jianli1,2,3, He Qisheng4, Tian Yuan5, Mamat·Sawut1,2, Wang Hong1,2, Gui Dongwei6,7   

  1. 1. College of Resources and Environment Science, Xinjiang University Urumqi 830046;2. Key Laboratory of Oasis Ecology of Ministry of Education, Xinjiang University Urumqi 830046;3. Graduate School of Xinjiang University Urumqi 830046;4. Department of Geographical Information Science, School of Earth Sciences and Engineering, Hohai University Nanjing 210098;5. Agriculture Resources and Regional Planning Office of Xinjiang Agricultural Department Urumqi 830001;6. Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences Urumqi 830011;7. Cele National Station of Observation & Research for Desert-Grassland Ecosystem in Xinjiang Cele 848300
  • Received:2009-10-14 Revised:2010-02-08 Online:2011-07-25 Published:2011-07-25

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Abstract:

Vegetation coverage, as an important part of the ecosystem, is closely related to the global climate and long-term economic benefits of the country. Meanwhile, vegetation coverage is an important parameter for the description and assessment of landscape or ecosystem. In the field remote sensing, application of vegetation index to describe vegetation coverage percentage is widely accepted and applied. In this paper, we took the delta oasis of Weigan and Kuqa rivers as research object. This study was based on the TM/ETM+ images of 1989, 2001 and 2006, and applied the ENVI, ArcGIS software as technology methods. The vegetation index of VBSI was used to estimate the model of vegetation coverage according to the dimidiate pixel principle, and the estimation precision was later approved to be up to 83.52%. Further, we produced the vegetation coverage graduation map of the delta oasis of Weigan and Kuqa rivers, and analyzed and appraised changes in its structure. The results revealed a pattern of spatial change in the vegetation coverage of the study area. Forest, grassland and farmland were three main land use types in medium-high and high coverage and played an important role in keeping vegetation cover. Forest area determined the changes of coverage area, while the other two land use types were definitely able to affect direction of the changes. Since forest, grassland and farmland played an important part in keeping regional vegetation coverage, it should be planned to continually plant trees, maintain grassland, protect farmland and control unused land in a long-term program. Finally, variation of vegetation environment quality from 1989 to 2006 was evaluated according to distribution of quantity and space condition rendered by plant cover digital image. By comparing plant cover grade images of the three periods with local statistics materials, this paper pointed out that the development of Wei-Ku oasis soil salinization was controlled by two important reasons nature and humanity. In conclusion, this study provided the reference for the protection of ecological environment in Wei-Ku oasis.

Key words: remote sensing, vegetation coverage, the vegetation index of VBSI, dimidiate pixel model, the delta oasis of Weigan and Kuqa Rivers

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