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J. Hefei Univ. Tech. (Nat. Sci.)

合肥工业大学学报(自然科学版)

JOURNAL OF HEFEI UNIVERSITY OF TECHNOLOGY (NATURAL SCIENCE)

Competent Authorities: Ministry of Education of the People's Republic of China

Sponsor by: Hefei University of Technology

ISSN 1000-1646, CN 34-1001/N

Spatiotemporal evolution and analysis of fractional vegetation cover in Hefei City based on Landsat time series remote sensing images

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基于 Landsat 时间序列遥感影像的合肥市 FVC 时空演化与分析

Journal Information

J. Hefei Univ. Tech. (Nat. Sci.), Feb.2023, Vol.46 No.2: 221-228

DOI: 10.3969/j.issn.1003-5060.2023.02.012

Authors

WU Qingyun, GAO Fei, LI Zhenxuan, CHE Zijie

(School of Civil and Hydraulic Engineering, Hefei University of Technology, Hefei 230009, China)

Abstract and Keywords

Abstract: This paper inverses the fractional vegetation cover(FVC) in Hefei City from 2008 to 2019 using the dimidiate pixel model based on Landsat TM/ETM+/OLI remote sensing images. Then, the Markov transfer matrix and difference image algorithm are applied for quantitative analysis of the FVC change characteristics at different levels in Hefei City from 2008 to 2019. The results show that the average value of FVC in Hefei City in 2008, 2011, 2013, 2015, 2017 and 2019 is 60.9%, 48.4%, 56.0%, 48.0%, 63.0% and 61.2%, respectively. The annual average FVC fluctuates greatly, but the overall trend is on the rise; the change of FVC in Hefei City is mainly at the level of stable areas, the peripheral FVC of the main urban area has a trend of degradation, while those of Changfeng County, main urban area and Lujiang County increase significantly; the overall change trend of FVC at all levels in the study area is benign, and the FVC is expected to increase in the future; the temperature in Hefei City shows an upward trend from 2008 to 2019, while the precipitation shows a downward trend, with an overall performance of warming and drying. And this trend can promote the increase of FVC in Hefei City, in which the annual average temperature is the main factor affecting the evolution of FVC.

Keywords: fractional vegetation cover(FVC); dimidiate pixel model; spatiotemporal variation characteristic; meteorological factor

作者信息

吴青云，高飞，李振轩，车子杰

（合肥工业大学土木与水利工程学院，安徽合肥230009）

摘要和关键词

摘要: 文章基于 Landsat 时间序列遥感影像,采用像元二分模型反演合肥市 2008—2019 年植被覆盖度 (fractional vegetation cover, FVC), 并利用马尔可夫转移矩阵与差值图像算法, 定量分析 2008—2019 年合肥市不同等级 FVC 变化特征。研究结果表明: 2008 年、2011 年、2013 年、2015 年、2017 年、2019 年合肥市平均 FVC 分别为 60.9%、48.4%、56.0%、48.0%、63.0%、61.2%, 年均 FVC 波动较大, 但总体呈上升趋势; 合肥市 FVC 变化以稳定区为主, 主城区的外围 FVC 出现退化趋势, 而长丰县、主城区及庐江县 FVC 增长明显; 各等级 FVC 总体变化趋势为良性, 未来 FVC 预计以增加为主; 2008—2019 年合肥市气温呈升高趋势, 而降水量呈下降趋势, 总体表现为 “暖干化”, 且这种趋势对合肥市 FVC 增加具有促进作用, 其中年均气温是影响 FVC 演化的主要因子。

关键词: 植被覆盖度(FVC)；像元二分模型；时空变化特征；气象因子

Funding

安徽省自然科学基金资助项目(2208085QD105);安徽省测绘科技专项资金资助项目(CHZX201801)和中央高校基本科研业务费专项资金资助项目(JZ2021HGTA0167)

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