| Application of multi-source NDVI data to desertification monitoring in the basin of the Manasi River |
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| DOI：10.7606/j.issn.1000-7601.2010.03.38 |
| Key Words: the basin of the Manasi River desertification MOD13A1 AVHRR NDVI |
| Author Name | Affiliation | | LIU Yan | Institute of Desert Meteorological, China Meteorological Administration, Urumqi 830002, China | | LI Yang | Institute of Desert Meteorological, China Meteorological Administration, Urumqi 830002, China | | ZHANG Pu | Institute of Desert Meteorological, China Meteorological Administration, Urumqi 830002, China | | RUAN Huihua | Meteorological Information Center of Guangdong, Guangzhou 510080, China |
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| Abstract: |
| We built two NDVI data classification index systems based on analysis of every ten-day 500 m×500 m MOD13A1- NDVI data and the same period's 8x8km AVHRR-NDVI data, for long term precise desertification moni-toring in the basin of the Manasi River. Then we analyzed spatial-temporal pattem differences of three kinds of NDVI data
and further give the reason of deserification, in a combination with Landsat-5/TM data of eight months in the years of
1989, 2000 and 2008. The results show: (1) In the same period, the monitoring results reveal similar spatial-temporal
pattem change trends interchangeably using AVHRR, MOD13A1 and Landsat -5/TM data. The north of oasis band adja-cent to Gurbantonggut Desert is covered by sparse vegetation and the corresponding NDVI is small. The south asis is covered by well-growing vegetation and the NDVI there is larger on the whole. Vegetation covering has striking spatial-temporal pattem differences associated with environmental factors, such as terrain factors, water, heat conditions, geo-morphological pattems, and soil physical and chemical properties. (2) In the last twenty years, the periphery of oasis band extended rapidly to the south, from 11 200 km2 in the mid 1980s to 12 672 km2 in the late 1990s, with an increase of 1472 km2; in the interior of oasis NDVI is increasing annually in a linear trend at the reclamation area with Shihezi as the center. (3) In the last eight years, the interior of oasis had lttle changes , and the salinization of soil in the desertifi-cation zone has increased significantly, the area enlarged from 1712 km2 to 1 906 km2 during 2000 to 2008, and the east mountain basins have been reclaimed with an area of 196 km2. |
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