Abstract: Rapid and accurate assessment of urban fractional vegetation cover quality and its change is of important reference to ecological construction and environmental protection. Taking Grand Canal cultural belt in Cangzhou City as an example and choosing Landsat images in 2010 and 2020, based on normalized difference vegetation index the fractional vegetation cover were assessed from 2010 to 2020. The results show that:(1)In 2010 and 2020, the values of FVC  increased from 0.352 to 0.411, showing an trend of increase, especially in the southern area. (2) From 2010 to 2020, 52.6% of the vegetation covered area remained unchanged, 20.2% of the areas decreased, and 27.2% of the areas was increased. Among them, the reduced part mainly concentrated in city center of Cangzhou, Botou, Dongguang, Wuqiao and Qingxian. By analyzing the vegetation coverage change in the past 10 years, it is indicated that the measures to protection, inheritance and utilization of the Grand Canal have achieved initial results,the vegetation coverage of the grand canal cultural belt has been continuously improved.

Key words: Grand Canal cultural belt, normalized difference vegetation index, fractional vegetation cover, remote sensing

摘要： 快速准确评估城市植被覆盖度质量及变化对于城市生态建设和环境保护具有重要作用。研究选择大运河文化带沧州段2010年和2020年Landsat遥感影像，运用归一化植被指数方法对10年间植被覆盖度（FVC）进行了评估和变化分析，结果发现：2010—2020年研究区植被覆盖度均值由0.466下降至0.411，其中中、北部地区下降明显。2010—2020年间有28.28%的地区植被覆盖度保持不变，48.24%的地区植被覆盖度减少，23.48%的地区植被覆盖度增加；其中减少部分主要集中在沧州市中心城区、泊头县城区、沧县城区、南皮县城区、青县县城区。通过分析10年间植被覆盖度变化，说明近10年沧州城市化进程不断加快，建筑用地面积不断扩张，整体植被覆盖度降低；高覆盖地区面积略有增加，说明在建设大运河文化带过程中，注重绿色、生态发展模式。

关键词: 大运河文化带, 归一化植被指数, 植被覆盖度, 遥感