贵州省北盘江流域2000-2018年NDVI变化及其与地形梯度、人口分布的关系
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K903;C924.2;P237

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国家自然科学基金项目“西南山地流域城市化与生态环境的耦合关系研究:以贵州乌江流域为例”(41261039);贵州省科技厅项目(黔科合J字[2009]2253)


Changes of NDVI in Beipan River Basin of Guizhou Province and Its Relationship with Terrain Gradient and Population Distribution During 2000-2018
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    摘要:

    [目的] 研究贵州省北盘江流域NDVI变化及其与地形梯度、人口分布的关系,为喀斯特地区植被恢复、退耕还林开展、国土空间优化整治等提供科学参考。[方法] 采用2000—2018年贵州省北盘江流域NDVI数据,分析其时空变化特征及与海拔、坡度、人口密度等影响因素的相互关系。[结果] ①2000—2018年北盘江流域NDVI值总体呈上升趋势,且年均增长稳定,植被呈现不断恢复的趋势。②2000年北盘江流域NDVI空间分布在东南部最高,在西北部最低,NDVI高值在中部地区分布较为破碎,至2018年各地区NDVI值差距显著缩小,其中在西北部和中部NDVI低值区转变最为明显。③2000—2018年北盘江NDVI显著减少、轻微减少及轻微增加的地区面积较少,面积比例不足10%;而显著增加地区面积为19 986.04 km2,比例为90.93%。④2000—2018年,北盘江流域NDVI的海拔效应表现为阶段变化特点,其中2000—2010年NDVI值随着海拔的上升总体呈现下降趋势;2010—2018年NDVI值随着海拔的上升总体呈现上升趋势;NDVI值随坡度增加表现为上升—下降趋势;而NDVI值随人口密度增加呈降低趋势。[结论] 地形因子奠定植被生长条件,而社会和人为因子对NDVI值变化影响较大。

    Abstract:

    [Objective] The changes of NDVI in the Beipan River basin of Guizhou Province and its relationship with terrain gradients and population distribution were studied in order to provide scientific reference for vegetation restoration, implementation of returning farmland to forest land, land space optimization and renovation in karst areas.[Methods] Based on NDVI data of the Beipan River basin in Guizhou Province from 2000 to 2018, the temporal and spatial change characteristics and their relationship with altitude, slope, population density and other influencing factors were analyzed.[Results] ① From 2000 to 2018, the NDVI of Beipanjiang River basin showed an overall upward trend, the annual average growth was stable, and the vegetation showed a trend of continuous recovery. ② In 2000, the spatial distribution of NDVI in the Beipanjiang River basin was the highest in the southeast while the lowest in the northwest. The distribution of the high NDVI area was fragmented in the central region. By 2018, the difference of NDVI values in different regions was significantly reduced, and the change was the most obvious in the low NDVI regions in the northwest and central region. ③ From 2000 to 2018, the areas with significant decrease, slight decrease and slight increase of NDVI in Beipanjiang were less than 10%. The area of the significantly increased region was 19 986.04 km2, accounting for 90.93%. ④ From 2000 to 2018, the altitude effect of NDVI in the Beipanjiang River basin was characterized by phase changes. Among them, the NDVI value from 2000 to 2010 showed an overall downward trend with the increase of altitude, while the NDVI value from 2010 to 2018 showed an overall upward trend with the increase in altitude. The value of NDVI showed an up-down trend with the increase of slope. The value of NDVI decreased with the increase of population density.[Conclusion] Topographic factors laid the foundation for vegetation growth, while social and human factors had great influence on the variation of NDVI.

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尉文艺,李旭东.贵州省北盘江流域2000-2018年NDVI变化及其与地形梯度、人口分布的关系[J].水土保持通报,2021,41(6):361-368

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  • 收稿日期:2021-04-04
  • 最后修改日期:2021-06-28
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  • 在线发布日期: 2022-01-06
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