| Fraction of vegetation coverage (FVC), an important index to depict the conditions of land covered by vegetation, is increasingly used in monitoring grassland degradation in ecological researches. Hulunbuir Steppe is located in transitional region from Meadow steppe to desert steppe, so the dynamic changes of vegetation coverage in Hulunbuir Steppe have become a public focus among recent researches. In this paper, using the Moderate-Resolution Imaging Spectrora-diometer(MODIS) data with 1-km&&16 days resolution from 2000 to 2014, as well as combining with Pixel Decomposition Models and data of Land Cover Classification, the temporal-spatial changes of vegetation coverage and ET were analyzed in this paper. Additionally, the break-growth-information points of Fractional Vegetation Coverage (FVC) time series were also analyzed.Results showed that a decreased tendency occurred in the early period then showed an increased tendency latter in vegetation coverage over 15 years. For spatial distribution pattern, the regions showed significant dynamic changes mainly distributed in the east of study area. Break-growth-information points mainly correlated with temperature in green-up period and green-end period, however, break-growth-information points occurred in period of peak of greenness mainly correlated with precipitation. Additionally, the evapotranspiration of the whole study area in different levels presents the pattern that the east and west shows high level and low level, respectively. The results of temporal-spatial changes of evapotranspiration over 15 years show that the areas of evapotranspiration with no significant change of the study area decreased and that with significant changes gradually increased.Moreover, the ET strongly correlated with FVC over 15 years. Notely, the changes of FVC over study area have stronger relationships with the development of the Industrial and Mining, the populations of the tourism industry included. |
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