| 杨志辉,赵军,温媛媛.青土湖区植被与土壤盐渍化响应研究[J].干旱地区农业研究,2020,38(3):231~237 |
| 青土湖区植被与土壤盐渍化响应研究 |
| Study of response of vegetation coverage to salinization in Qingtu Lake |
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| DOI：10.7606/j.issn81000-7601.2020.03.29 |
| 中文关键词: 土壤盐渍化 植被覆盖度 生态遥感 相关性 青土湖 |
| 英文关键词:soil salinization vegetation coverage ecological remote sensing Qingtu Lake |
| 基金项目:国家自然科学基金项目（41661084；41761083） |
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| 中文摘要: |
| 以甘肃民勤县青土湖为研究区，用Landsat OLI数据计算植被覆盖度（FVC）和改进盐渍化指数（MSI），在分级分析和探究两者相关性的基础上，定量分析了不同植被覆盖度和发展变化特征对不同程度盐渍土的响应。结果表明：2015—2017年中高和高覆盖度植被占比较低，分别为4.3%和2.0%，极低覆盖度占比最大为50.0%，低覆盖度占比为44.3%。2015—2017年非盐渍土面积为25.9%，重度盐渍土占研究区总面积的45.4%。植被覆盖度和土壤盐渍化呈显著负相关，相关系数为-0.691。高覆盖度和中高覆盖度植被分布于非盐渍土区域达90.0%以上，极低覆盖度植被分布于盐渍土区域面积为93.4%。青土湖浅水区植被覆盖度与改进盐渍化指数呈显著负相关关系(r=-0.532, P<0.05)的面积为88.95 km2，占研究区总面积的62.84%。且植被覆盖度发展和土壤盐渍化逆转区域在空间分布上相一致。因此，土壤盐渍化是影响青土湖区植被覆盖度的重要因素之一。 |
| 英文摘要: |
| 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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