2001—2020年湖北省植被覆盖时空变化研究

The Temporal and Spatial Variations of Vegetation Coverage in Hubei Province from 2001 to 2020

  • 摘要: 基于MOD13Q1数据,采用像元二分模型计算2001—2020年湖北省植被覆盖度,并在全域的基础上,结合地貌特征和生态功能格局,将全省划分为秦巴山区、武陵山区、大别山区、幕阜山区、鄂北岗地和江汉平原6个片区;通过Sen + Mann–Kendall、R/S分析法和Hurst指数等方法,探究20 a间湖北省全域及6个片区植被覆盖时空变化情况。结果表明:2001—2020年湖北省全域及6个片区植被覆盖度变化趋势均为基本不变。2010年,受极端天气影响,全省植被覆盖度为20 a最低。湖北省植被覆盖空间分布呈西高东低、边缘高中心低的格局,秦巴、武陵山区植被覆盖度极高,其他4个片区植被覆盖度也较高,但江汉平原植被覆盖度与其他5个片区有较明显差距。湖北省全域植被覆盖度呈现较强的空间正相关性,其局部空间自相关性主要表现为“高–高聚集”和“低–低聚集”。20 a间,湖北省植被改善区域占10.47%,退化区域占8.67%,80.88%的区域变化不大。各个片区整体植被覆盖情况与全域相似,但秦巴山区植被改善区域占比最大,占该片区的14.97%;而江汉平原植被退化区域占比最大,占该片区的18.09%。湖北省全域和6个片区未来植被覆盖基本保持稳定,不会出现大面积持续性的增加或减少。

     

    Abstract: Based on MOD13Q1 data, the vegetation coverage in Hubei Province from 2001 to 2020 was computed by employing the pixel dichotomy model. On a global scale, in combination with geomorphic characteristics and ecological functional patterns, the province was partitioned into 6 regions: Qinling-daba Mountains, Wuling Mountains, Dabie Mountains, Mufu Mountains, North Hillock and Jianghan Plain. Utilizing methodologies such as Sen+Mann–Kendall analysis, R/S analysis, and the Hurst index facilitated an investigation into the spatiotemporal changes in vegetation coverage across Hubei Province and its 6 regions over the past 2 decades. The results showed that from 2001 to 2020, the trend of vegetation coverage in Hubei Province and 6 other regions, remained largely stable. In 2010, as a result of the influence of extreme weather conditions, the vegetation coverage throughout the province declined to its lowest level in 2 decades. The spatial distribution of vegetation coverage throughout Hubei Province displayed a pattern characterized by higher values in western areas compared to eastern ones; specifically high levels were found at margins while lower levels were concentrated centrally. The Qinling-daba Mountains and Wuling Mountains exhibited exceptionally high vegetation coverage; although all 4 remaining regions also exhibited relatively high values, there was still a notable disparity between Jianghan Plain's coverage and that of the other 5 regions. Overall spatial positive correlation was evident across all of the province's vegetative coverage with local spatial autocorrelation primarily manifesting as "high-high aggregation" alongside "low-low aggregation". Over the past 2 decades, the area of vegetation improvement in Hubei province constituted 10.47%, while the area experiencing degradation accounted for 8.67%. Notably, 80.88% of the region exhibited minimal change in vegetation coverage. The overall patterns of vegetation coverage across various regions were consistent with those observed at the provincial level; however, the Qinling-Daba Mountains demonstrated the highest proportion of vegetation improvement, comprising 14.97% of that region's total area. Conversely, the Jianghan Plain recorded the largest share of vegetation degradation, representing 18.09% within its boundaries. Looking ahead, it is anticipated that vegetation coverage in Hubei Province and 6 regions will remain relatively stable, without significant sustained increases or decreases on a large scale.

     

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