Spatiotemporal Evolution of Fractional Vegetation Cover and Its Response to Climate Change Based on MODIS Data in the Subtropical Region of China

The subtropical vegetation plays an important role in maintaining the structure and function of global ecosystems, and its contribution to the global carbon balance are receiving increasing attention. The fractional vegetation cover (FVC) as an important indicator for monitoring environment change, is widely used to analyze the spatiotemporal pattern of regional and even global vegetation. China is an important distribution area of subtropical vegetation. Therefore, we first used the dimidiate pixel model to extract the subtropical FVC of China during 2001–2018 based on MODIS land surface reflectance data, and then used the linear regression analysis and the variation coefficient to explore its spatiotemporal variations characteristics. Finally, the partial correlation analysis and the partial derivative model were used to analyze the influences and contributions of climate factors on FVC, respectively. The results showed that (1) the subtropical FVC had obvious spatiotemporal heterogeneity; the FVC high-coverage and medium-coverage zones were concentratedly and their combined area accounted for more than 70% of the total study area. (2) The interannual variation in the average subtropical FVC from 2001 to 2018 showed a significant growth trend. (3) In 76.28% of the study area, the regional FVC showed an increasing trend, and the remaining regional FVC showed a decreasing trend. However, the overall fluctuations in the FVC (increasing or decreasing) in the region were relatively stable. (4) The influences of climate factors to the FVC exhibited obvious spatial differences. More than half of all pixels exhibited the influence of the average annual minimum temperature and the annual precipitation had positive on FVC, while the average annual maximum temperature had negative on FVC. (5) The contributions of climate changes to FVC had obvious heterogeneity, and the average annual minimum temperature was the main contribution factor affecting the dynamic variations of FVC.

[1]  Li Bao-sheng,et al.  Changes of Vegetation Coverage During Recent 18 Years in Lianjiang River Watershed , 2011 .

[2]  Shaohong Wu,et al.  NDVI-Based Vegetation Change in Inner Mongolia from 1982 to 2006 and Its Relationship to Climate at the Biome Scale , 2014 .

[3]  Guoyi Zhou,et al.  Estimates of soil respiration and net primary production of three forests at different succession stages in South China , 2006 .

[4]  Liu Yanju,et al.  Response of vegetation cover to drought in the northern slope of the Tianshan Mountains during 2001—2015 based on the land⁃use and land⁃cover change , 2019 .

[5]  罗垚 Luo Yao,et al.  Study of temporal and spatial variation and driving force of fractional vegetation cover in upper reaches of Minjiang River from 2006 to 2016 , 2019 .

[6]  Qian Zhou,et al.  Impact of Urbanization and Climate on Vegetation Coverage in the Beijing-Tianjin-Hebei Region of China , 2019, Remote. Sens..

[7]  Yuanbo Liu,et al.  Contrast Effects of Vegetation Cover Change on Evapotranspiration during a Revegetation Period in the Poyang Lake Basin, China , 2018 .

[8]  李林 Li Lin,et al.  Distributional regularity of species diversity in plant community at different latitudes in subtropics , 2020 .

[9]  Zhaoning Gong,et al.  Correlation analysis between vegetation coverage and climate drought conditions in North China during 2001–2013 , 2017, Journal of Geographical Sciences.

[10]  赵文吉 Zhao Wenji,et al.  Temporal analysis of climate change and its relationship with vegetation cover on the north china plain from 1981 to 2013 , 2017 .

[11]  E. Small,et al.  The impact of soil reflectance on the quantification of the green vegetation fraction from NDVI , 2005 .

[12]  Yuanyuan Zhao,et al.  Spatiotemporal Variation of Vegetation Coverage and Its Response to Climate Factors and Human Activities in Arid and Semi-Arid Areas: Case Study of the Otindag Sandy Land in China , 2020, Sustainability.

[13]  Cao Chunxiang,et al.  Remotely sensed diagnosing temporal and spatial variation of vegetation coverage in Guangxi based on MODIS NDVI data. , 2019 .

[14]  Jan Verbesselt,et al.  Detecting Clear-Cuts and Decreases in Forest Vitality Using MODIS NDVI Time Series , 2015, Remote. Sens..

[15]  R. Tateishi,et al.  Relationships between percent vegetation cover and vegetation indices , 1998 .

[16]  Qinhuo Liu,et al.  Estimating fractional vegetation cover from leaf area index and clumping index based on the gap probability theory , 2020, Int. J. Appl. Earth Obs. Geoinformation.

[17]  Quan Sun,et al.  ractional vegetation cover estimation in arid and semi-arid environments using J-1 satellite hyperspectral data , 2012 .

[18]  Li Yanan,et al.  Assessing the effects of the Green for Grain Program on ecosystem carbon storage service by linking the InVEST and FLUS models: A case study of Zichang county in hilly and gully region of Loess Plateau , 2020 .

[19]  Shilong Piao,et al.  NDVI-based increase in growth of temperate grasslands and its responses to climate changes in China , 2006 .

[20]  Ji-xi Gao,et al.  [Effects of climate and land use change on the changes of vegetation coverage in farming-pastoral ecotone of Northern China]. , 2008, Ying yong sheng tai xue bao = The journal of applied ecology.

[21]  Alireza Sharifi,et al.  Comparison the accuracies of different spectral indices for estimation of vegetation cover fraction in sparse vegetated areas , 2011 .

[22]  Zhou We.  Spatial-temporal dynamics of grassland coverage and its response to climate change in China during 1982-2010 , 2014 .

[23]  Joachim Ingwersen,et al.  Determining the spatial and temporal dynamics of the green vegetation fraction of croplands using high-resolution RapidEye satellite images , 2015 .

[24]  Jiongxin Xu,et al.  Spatiotemporal variations of vegetation cover on the Chinese Loess Plateau (1981–2006): Impacts of climate changes and human activities , 2008 .

[25]  Liu Xianfen.  Spatiotemporal variation of vegetation coverage in Qinling-Daba Mountains in relation to environmental factors , 2015 .

[26]  Jong Yoel Lee,et al.  Monitoring of Vegetation Dynamics in the Mongolia Using MODIS NDVIs and their Relationship to Rainfall by Natural Zone , 2015, Journal of the Indian Society of Remote Sensing.

[27]  Wei Zhou,et al.  Grassland Coverage Changes and Analysis of the Driving Forces in Maqu County , 2012 .

[28]  Variation of vegetation NDVI and its response to climate change in Zhejiang Province , 2012 .

[29]  S. Gruber,et al.  REDCAPP (v1.0): parameterizing valley inversions in air temperature data downscaled from reanalyses , 2017 .

[30]  孙然好 Sun Ranhao,et al.  Temporal-spatial analysis of vegetation coverage dynamics in Beijing-Tianjin-Hebei metropolitan regions , 2017 .

[31]  Jiang Jingang,et al.  Reconstruction of NDVI time-series datasets of MODIS based on Savitzky-Golay filter , 2010, National Remote Sensing Bulletin.

[32]  Xiaoyu Song,et al.  A study on the relationship between dynamic change of vegetation coverage and precipitation in Beijing's mountainous areas during the last 20 years , 2011, Math. Comput. Model..

[33]  Philippe Ciais,et al.  The carbon balance of terrestrial ecosystems in China , 2009, Nature.

[34]  W. J. Wang,et al.  NDVI, temperature and precipitation changes and their relationships with different vegetation types during 1998–2007 in Inner Mongolia, China , 2013 .

[35]  Juan Wang,et al.  [Change characteristics and their causes of fractional vegetation coverage (FVC) in Shaanxi Province]. , 2010, Ying yong sheng tai xue bao = The journal of applied ecology.

[36]  Zhang Xue-li.  Vegetation Coverage Distribution and Its Changes in Plan Blue Banner Based on Remote Sensing Data and Dimidiate Pixel Model , 2012 .

[37]  C. Tucker.  Red and photographic infrared linear combinations for monitoring vegetation , 1979 .

[38]  W. Ju,et al.  Spatial Differences of Variations of Vegetation Coverage in Inner Mongolia during 2001-2010 , 2012 .

[39]  A. Huete,et al.  A review of vegetation indices , 1995 .

[40]  申文明 Shen Wenming,et al.  The spatio-temporal variations of vegetation cover in the Yellow River Basin from 2000 to 2010 , 2013 .

[41]  Wang Heng,et al.  Spatial and Temporal Variations of Vegetation Belts and Vegetation Cover Degrees in Inner Mongolia from 1982 to 2003 , 2009 .