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[1]ZONG Jiaquan,BAI Shuying,FENG Chaoyang,et al.Spatiotemporal Variation Characteristics of Ecological Status in China Based on Continuous Time Series NDVI Data[J].Research of Soil and Water Conservation,2021,28(01):132-138.

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Spatiotemporal Variation Characteristics of Ecological Status in China Based on Continuous Time Series NDVI Data

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 28 Number of periods: 2021 01 Page number: 132-138 Column: Public date: 2021-01-10

Title:: Spatiotemporal Variation Characteristics of Ecological Status in China Based on Continuous Time Series NDVI Data

Author(s):: ZONG Jiaquan¹, BAI Shuying¹, FENG Chaoyang², PU Yang ¹; (1.Nanjing University of Information Science & Technology, Nanjing 210044, China; 2.State Environmental Protection Key Laboratory of Regional Eco-process and Function Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China)

Keywords:: GIMMS NDVI_3g; MODIS NDVI; ecosystem; spatiotemporal change

CLC:: TP79

DOI:: -

Abstract:: Vegetation is an important indicator to characterize the ecological environment, and NDVI(Normalized Difference Vegetation Index)is an important indicator to reflect the status of vegetation. The spatiotemporal characteristics of NDVI can reveal the regional ecological environment. This study used the data in the same period to establish a fitting equation based on data production of GIMMS NDVI_3g from 1981—2015 and MODIS NDVI from 2000—2018. We fitted and modified the GIMMS NDVI_3g from 1981—2000 to construct a long-term sequence(1981—2018)of NDVI dataset. NDVI dataset was selected from non-arable land, non-settlement areas, and wetlands. We applied the trend analysis method to analyze the spatial-temporal distribution characteristics and changing patterns of NDVI's ecological status in China in the past 40 years. It also statistically analyzed NDVI of different ecosystem types. These change features can reflect the spatiotemporal variability of China's ecological status in the past 40 years. The results showed that the revised GIMMS NDVI data had a similar variation pattern with MODIS NDVI data on a year and month time scale except for 2000 and 2001; the spatial distribution of NDVI showed that NDVI value was high in the northeast(0.775), central south(0.732), and eastern china(0.668), and was low in the southwest(0.485), north(0.471), and northwest china(0.275); in the past 40 years, NDVI overall kept stable; the status of forest and grassland ecosystems presented a positive trend, but the ecological conditions from deserts, water bodies and wetlands deteriorated; the ecological conditions of other ecosystems have deteriorated, and the downward trends of NDVI are: -0.000 6, -0.001 7, -0.000 7 per year, respectively. This study attempts to provide decision-making support for maintaining China's ecological environment, to protect biodiversity, and to conduct ecological environment assessment.

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Last Update: 2021-01-15