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1988-2018年哈密绿洲植被覆盖度时空变化及其驱动力
高鹏文1, 阿里木江·卡斯木1,2, 赵永玉1, 图尔荪阿依·如孜1, 赵禾苗1, 哈力木拉提·阿布来提1
1.新疆师范大学 地理科学与旅游学院, 新疆 乌鲁木齐 830054;2.新疆师范大学 丝绸之路经济带城镇化发展研究中心, 新疆 乌鲁木齐 830054
摘要:
[目的] 对近30 a来哈密绿洲植被覆盖度时空变化及驱动力进行分析,为该地区绿洲持续健康发展提供理论借鉴。[方法] 以1988,1998,2008及2018年4期影像为基础数据,利用像元二分模型计算了基于AFRISWIR2指数提取的植被覆盖度,利用动态度指数与植被覆盖度转移矩阵分析哈密绿洲植被覆盖度动态变化;再通过地理探测器对8个影响因子进行探测,探寻哈密绿洲植被覆盖度的驱动因子。[结果] 近30 a来哈密绿洲面积从1988年的214 km2增长到2018年的632.1 km2,增幅达195%,但绿洲内植被覆盖度等级却较低,同时哈密绿洲面积主要扩展的区域在西北部和东南部区域;哈密绿洲的发展阶段可分为3个阶段:1988-1998年为低强度稳定期,1998-2008年为极度扩张期,2008-2018年为高强度稳定期。[结论] 土地利用类型变化是造成哈密绿洲植被覆盖度变化的直接原因,同时在近30 a内,人为因素对哈密绿洲植被覆盖状况的影响远高于自然因素。
关键词:  植被覆盖度  像元二分模型  地理探测器  哈密绿洲
DOI:10.13961/j.cnki.stbctb.2020.06.039
分类号:S157.1;TP79
基金项目:国家自然科学基金项目“一带一路”新疆段城镇景观格局变化及生态安全评价(41661037);自治区研究生科研创新项目(XJ2020G237)
Spatial and Temporal Changes and Driving Forces of Vegetation Coverage in Hami Oasis During 1988-2018
Gao Pengwen1, Kasim·Alimujiang1,2, Zhao Yongyu1, Ruzi·Tursunayi1, Zhao Hemiao1, Halimulati·Abulaiti1
1.College of Geographical Science and Tourism, Xinjiang Normal University, Urumqi, Xinjiang 830054, China;2.Research Center of Urbanization Development of Silk Road Economic Belt, Xinjiang Normal University, Urumqi, Xinjiang 830054, China
Abstract:
[Objective] The temporal and spatial changes and driving forces of vegetation coverage in Hami Oasis in the past 30 years were analyzed in order to provide theoretical reference for the sustainable and healthy development of oasis in this area.[Methods] Based on the 4 images of 1988, 1998, 2008 and 2018, the vegetation coverage extracted from the AFRISWIR2 index was calculated using the pixel binary model. The vegetation coverage of Hami Oasis was analyzed using the dynamic index and the vegetation coverage transfer matrix. Then, 8 influencing factors were detected by the geographic detector, to explore the driving factors of the vegetation coverage of Hami Oasis.[Results] In the past 30 years, the area of Hami Oasis increased from 214 km2 in 1988 to 632.1 km2 in 2018, with increase range of 195%. The development speed was relatively fast, but the level of vegetation coverage in the oasis was low. At the same time, the main expansion area was in the northwest and southeast regions. The development stage was defined as follows:1988-1998 was the low-strength stable period, 1998-2008 was the period of extreme expansion, and 2008-2018 was the high-strength stable period.[Conclusion] The change of land use type is the direct cause of the change of vegetation coverage in Hami Oasis. At the same time, in the past 30 years, the influence of human factors on vegetation coverage of Hami Oasis is much higher than natural factors.
Key words:  vegetation coverage  pixel binary model  geodetector  Hami Oasis