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2001-2018年贵州省NDVI时空演变及其对气候变化和人类活动的响应
刘阳1,2, 周忠发1,2, 闫利会1,3
1.贵州师范大学 喀斯特研究院/地理与环境科学学院, 贵阳 550001;2.贵州省喀斯特山地 生态环境国家重点实验室培育基地, 贵阳 550001;3.国家喀斯特石漠化防治工程技术研究中心, 贵阳 550001
摘要:
[目的] 研究贵州省植被覆盖对气候变化和人类活动的响应程度,为区域生态环境建设提供理论依据。[方法] 选取2001-2018年MODIS13 A1影像,结合气象数据,利用线性趋势分析、偏相关分析和残差分析等方法,分析了贵州省18年间NDVI的时空变化特征,探究了NDVI对气候变化的响应规律以及人类活动对NDVI的影响。[结果] ①2001-2018年贵州省NDVI呈现显著上升趋势,增长速率为0.005 3/a,空间上极显著增加和显著增加区域面积分别占研究区域的52.80%和16.80%。②2001-2018年贵州省气候向暖湿方向发展,NDVI与气温和降水呈正相关关系,且NDVI对气温的敏感性高于降水。③月尺度上NDVI对气温的响应不存在滞后性,对降水响应存在一个月滞后性;NDVI与气候月尺度相关性高于年尺度。④人类活动对贵州省植被覆盖作用日益增强,对NDVI贡献度为72.30%。[结论] 人类活动对NDVI的影响大于气候变化,贵州省植被变化是气候变化和人类活动共同作用的结果。
关键词:  NDVI  气候变化  滞后性  人类活动  贵州省
DOI:10.13961/j.cnki.stbctb.2021.01.044
分类号:Q948
基金项目:国家自然科学基金地区项目“喀斯特石漠化地区生态资产与区域贫困耦合机制研究”(41661088);贵州省科技计划项目“喀斯特洞穴系统碳循环机制研究”(黔科合基础[2020]1Y154);贵州省高层次创新型人才培养计划“百”层次人才(黔科合平台人才[2016]5674)。
Spatio-temporal Variation in NDVI and Its Response to Climate Change and Human Activities in Guizhou Province During 2001-2018
Liu Yang1,2, Zhouzhong Fa1,2, Yan Lihui1,3
1.Karst Research Institute/Department Geography and Environment Sciences, Guizhou Normal University, Guiyang, Guizhou 550001, China;2.State Key Laboratory Incubation Base for Karst Mountain Ecology Environment of Guizhou Province, Guiyang, Guizhou 550001, China;3.State Engineering Technology Institute for Karst Desertification Control, Guiyang, Guizhou 550001, China
Abstract:
[Objective] The response of vegetation coverage to climate change and human activities in Guizhou Province was studied to provide important guidance for restoring the regional ecological environment.[Methods] Based on MODIS13 A1 data and meteorological data, the spatio-temporal variation in the normalized difference vegetation index (NDVI) during 2001-2018 in Guizhou Province was analyzed. Moreover, the impact of climate change and human activities on the NDVI was explored with linear trend analysis, partial correlation, and residual methods.[Results] ① The NDVI showed a significant upward trend at a growth rate of 0.005 3 per year in Guizhou Province during 2001-2018. In the space studied, the extremely significant and the significant improvement areas accounted for 52.80% and 16.80% of the study area, respectively. ② The climate showed a process of distinct warming and increasing humidity in Guizhou Province during 2001-2018. The NDVI was positively correlated with temperature and precipitation, and the NDVI was more sensitive to temperature than to precipitation. ③ There was no lag in the response of NDVI changes to temperature on a monthly scale, but there was a one-month lag in the response to precipitation. The correlation between the NDVI and climate change on a monthly scale was higher than that on an annual scale. ④ The effect of human activities on vegetation coverage was increasing in Guizhou Province, and the contribution to the NDVI was 72.30%.[Conclusion] The impact of human activities on the NDVI was greater than that of climate change. The spatio-temporal variation in the NDVI was the result of the combined effects of climate change and human activities in Guizhou Province.
Key words:  normalized difference vegetation index (NDVI)  climate change  lag  human activities  Guizhou Province