| Study of response of vegetation coverage to salinization in Qingtu Lake |
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| DOI：10.7606/j.issn81000-7601.2020.03.29 |
| Key Words: soil salinization vegetation coverage ecological remote sensing Qingtu Lake |
| Author Name | Affiliation | | YANG Zhihui | College of Geography and Environmental Sciences, Northwest Normal University, Lanzhou, Gansu 730070, China | | ZHAO Jun | College of Geography and Environmental Sciences, Northwest Normal University, Lanzhou, Gansu 730070, China | | WEN Yuanyuan | College of Geography and Environmental Sciences, Northwest Normal University, Lanzhou, Gansu 730070, China |
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| Abstract: |
| In this paper, the Qingtu Lake area of Minqin was used as the research area, and the Landsat OLI data was used to calculate the vegetation coverage (FVC) and the modified salinization index (MSI). The response of vegetation coverage and developmental features to different degrees of saline soil was quantitatively analyzed based on the hierarchical analysis and the correlation analysis between the FVC and MSI. The results showed that the medium\|high and high coverage vegetation accounted for a relatively low proportion 4.3% and 2.0% in 2015-2017, respectively. Extremely low coverage accounts for a maximum of 50.0% while low coverage accounted for 44.3%. The area of non\|saline soil was 25.9% in 2015-2017, and the heavily saline soil accounted for 45.4% of the study area. There was a significant negative correlation between vegetation coverage and soil salinity that the correlation coefficient was -0.691. The vegetation with high coverage and medium\|high coverage was distributed in more than 90.0% of non\|saline soil area, and extremely low\|coverage vegetation was distributed in 93.4% of saline soil areas. There was a significantly negative correlation between vegetation coverage and modified salinization index value (r=-0.532, P<0.05), which area was 88.95 km2 accounting for 62.84% of the study area. The spatial distribution of vegetation coverage development and soil salinity reversal areas were consistent. Therefore, soil salinization was one of the important factors affecting vegetation coverage in Qingtu Lake area. |
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