重庆植被覆盖度时空演变及驱动力地理学探究
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P237

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国家重点研究计划项目(2019YFB2102503,2019YFB2102502);重庆市自然科学基金面上项目(cstc2019jcyj-msxmX0626).


Geography study on spatiotemporal evolution of fractional vegetation coverage and the driving forces in Chongqing
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    摘要:

    为了分析2000以来重庆市植被时空变化情况及其驱动力作用性质,基于MODIS-NDVI数据,采用像元二分模型、差值法、均值法、一元线性回归模型研究重庆市2000~2015年遥感影像的植被覆盖度年、季时空演变特征,并利用地理探测器分析气温、降水量、人口密度、GDP等因子对植被覆盖度的交互影响作用,及重庆市植被适宜性生长区域。结果表明:(1)2000~2015年重庆市植被覆盖度季节均值呈春季到夏季增加,夏季到冬季减少的趋势;低覆盖度、中低覆盖度和中等覆盖度呈春季到夏季减少,夏季到冬季增加的趋势。(2)2000~2015年重庆市植被覆盖度总体趋于改善,植被覆盖度提升面积远远大于退化面积,植被覆盖度在空间分布上东部地区高于西部地区。(3)影响因子对植被覆盖度影响的强度依次为:气温>降水量>人口密度>GDP。人为因子和气候因子共同作用时,增强了对植被覆盖度的影响力。(4)重庆市植被生长适宜性区域是年均降水量等级为1383.3~1567.6 mm、气温分区为5~10.2℃、人口分区为22.7~211.5人/ km2及年均GDP为17~2947.7万元/ km2的地区。研究结果可为重庆市生态环境治理和保护提供科学依据,丰富地理探测器模型研究成果。

    Abstract:

    In order to analyze the spatiotemporal change of fractional vegetation and its driving forces in Chongqing since 2000, the MODIS-NDVI data, pixel dichotomous model, difference method, mean method and unary linear regression model were used to study the spatiotemporal and seasonal evolution characteristics of vegetation coverage of remote sensing images in Chongqing from 2000 to 2015. Geographic detector was used to analyse the interaction of temperature of precipitation, population density, GDP and other factors on vegetation coverage, and the suitable vegetation growth area in Chongqing was analyzed too. The results show that :(1) From 2000 to 2015, the seasonal mean of vegetation coverage in Chongqing increased from spring to summer, and decreased from summer to winter. The low, medium and low coverage tended to decrease from spring to summer and increase from summer to winter. (2) The vegetation coverage in Chongqing tended to improve from 2000 to 2015, and the increased area of vegetation coverage was much larger than the degraded area. The spatial distribution of vegetation coverage in the eastern region was higher than that in the western region. (3) The intensity of influence factors on FVC was as follows: temperature > precipitation > population density >GDP. When human factors and climate factors acted together, the influence on vegetation coverage was enhanced. (4) The area suitable for vegetation growth in Chongqing is the area with the average annual precipitation of 1383.3~1567.6 mm, the temperature of 5~10.2℃, the population of 22.7~211.5 person/ km2 and the average annual GDP of 17,9477,000 yuan/ km2. The research results can provide scientific basis for ecological environment management and protection in Chongqing and enrich the research results of geographical detector model.

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何清芸,牟凤云,李秋彦,等. 重庆植被覆盖度时空演变及驱动力地理学探究[J]. 科学技术与工程, 2021, 21(28): 11955-11962.
He Qingyun, Mou Fengyun, Li Qiuyan, et al. Geography study on spatiotemporal evolution of fractional vegetation coverage and the driving forces in Chongqing[J]. Science Technology and Engineering,2021,21(28):11955-11962.

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  • 收稿日期:2021-03-29
  • 最后修改日期:2021-07-14
  • 录用日期:2021-06-22
  • 在线发布日期: 2021-09-29
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