BIN Xin,CHENG Zhigang,WANG Junfeng,et al.Seasonal Variation of NDVI and Altitude Dependent Characteristics in Qinling-Daba Mountains in Recent 17 Years[J].Journal of Chengdu University of Information Technology,2019,(03):302-307.[doi:10.16836/j.cnki.jcuit.2019.03.016]
近17a秦巴山区NDVI季节变化差异及其海拔依赖性特征分析
- Title:
- Seasonal Variation of NDVI and Altitude Dependent Characteristics in Qinling-Daba Mountains in Recent 17 Years
- 文章编号:
- 2096-1618(2019)03-0302-06
- Keywords:
- atmospheric sciences; climate change and numerical simulation; NDVI; Qinling-Daba mountains; altitude; trend
- 分类号:
- P463.22
- 文献标志码:
- A
- 摘要:
- 针对秦巴山区植被特征的研究主要集中在陕西省境内、数据年份较早,难以表现近10 a快速城市化背景下整个山区植被变化特征。利用2001-2017年秦巴山区MODIS NDVI资料,结合MODIS LST数据,对横跨5省1市的整个秦巴山区NDVI的季节变化、海拔依赖性及其对地表温度响应进行了研究。结果表明:17 a秦巴山区NDVI已4.65%/10 a的速率增加,NDVI季节差异明显,表现为夏季>秋季>春季>冬季,冬季植被增长趋势最明显; 秦巴山区植被覆盖整体随海拔升高先增加后减小,500～1500 m植被覆盖最大; 在不同海拔梯度上,2001-2017年秦巴山区NDVI均呈增加趋势,增长速率随海拔升高先增加后减小,在500～1500 m NDVI增长速率最大为5.5%/10 a; 秦巴山区范围内NDVI与地表温度均呈正相关关系,且随着海拔升高,NDVI对地表温度的响应越大。
- Abstract:
- The study on vegetation characteristics of Qinling-Daba Mountains area is mainly concentrated in shananxi province, these data come from earlier years, so it is difficult to show the characteristics of vegetation change in the whole mountainous area under the background of rapid urbanization in recent 10 years. Based on the MODIS NDVI data from Qinling-Daba Mountains in 2001-2017 and the MODIS LST data, the seasonal variation, altitude dependence and surface temperature response of NDVI in the entire Qinling-Daba Mountains area are analyzed. The results show: NDVI in Qinling-Daba Mountains increased by 4.65%/10 a, the seasonal difference of the NDVI is obvious, the expression summer>autumn>spring>winter, and the winter vegetation growth trend is the most obvious; The vegetation cover of Qinling-Daba Mountains area increases first and then decreases with increasing altitude, the vegetation coverage of 500-1500 m is the largest; In different altitude gradients, the NDVI in Qinling-Daba Mountains area increased from 2001 to 2017, and the growth rate increased first and then decreased with altitude, the maximum growth rate of NDVI in the range of 500-1500 m was 5.5%/10 a; There is a positive correlation between NDVI and surface temperature in the Qinling-Daba Mountains, and the greater the response of NDVI to surface temperature as the altitude increases.
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备注/Memo
收稿日期:2018-12-13 基金项目:国家科技基础资源调查专项资助项目(2017FY100903); 国家电网公司总部科技资助项目(SGTYHT/17-JS-199)