Influence of inundation frequency change on enhanced vegetation index of wetland vegetation in Poyang Lake, China

doi:10.17521/cjpe.2021.0033

Abstract

Abstract:

Aims Inundation frequency (IF) is an important influencing factor on dynamics of wetland vegetation. This study analyzed the temporal and spatial variations of IF and enhanced vegetation index (EVI) of wetland vegetation and their correlation in Poyang Lake, so as to maintain the stability of wetland ecosystem.

Methods In view of the significant seasonal changes of Poyang Lake, its impact on wetland vegetation needs to be analyzed with a high temporal resolution method. Based on MODIS image data from 2000-03-01 to 2020-02-29, this study mapped the annual water inundation frequency of Poyang Lake, analyzed the temporal and spatial variations of EVI under different flooding conditions, and explored the response of EVI of wetland vegetation to changes in flooding conditions.

Important findings The following conclusions are drawn: (1) The hydrological rhythm of Poyang Lake has changed significantly in the past 20 years. The water area with high inundation frequency (IF >75%) decreased from 1 435.3 km² in 2000 to 510.25 km² in 2019, with a decrement of 64.45%. (2) The regional average EVI showed a significant upward trend. Vegetation expansion was mainly concentrated in the middle region of Poyang Lake which was also the main region of IF declining. (3) By analyzing the changes of average EVI value under different total IF regions, it was found that the variation trend of IF was similar to that of EVI. After 2009, the shrinking trend of the Poyang Lake water area was alleviated, and the growth rate of EVI decreased. (4) In the past 20 years, the changing trend of IF and EVI in Poyang Lake was highly consistent in spatial distribution. Wetland vegetation was mainly expanded along the decreasing direction of water area. This spatial heterogeneity further confirms that hydrological variation plays a role in regulating vegetation dynamics.

Key words: inundation frequency, Poyang Lake, wetland vegetation, MODIS, enhanced vegetation index

WEN Ke, YAO Huan-Mei, GONG Zhu-Qing, NA Ze-Lin, WEI Yi-Ming, HUANG Yi, CHEN Hua-Quan, LIAO Peng-Ren, TANG Li-Ping. Influence of inundation frequency change on enhanced vegetation index of wetland vegetation in Poyang Lake, China[J]. Chin J Plant Ecol, 2022, 46(2): 148-161.

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URL: https://www.plant-ecology.com/EN/10.17521/cjpe.2021.0033

https://www.plant-ecology.com/EN/Y2022/V46/I2/148

Figures/Tables 14

Fig. 1 Location of Poyang Lake.

Table 1 Images with 30 m moderate resolution of Poyang Lake in 2000-2019

年份 Year	日期 Date	传感器 Sensor
2000	2000-07-05	Landsat 7-TM
2001	2001-01-29	Landsat 7-TM
2005	2005-07-03	Landsat 7-TM
2006	2006-01-27	Landsat 7-TM
2010	2010-07-25	Landsat 5-TM
2011	2011-01-12	HJ 1A-CCD
2018	2018-07-31	Landsat 8-OIL
2019	2019-01-23	Landsat 8-OIL

Fig. 2 Training samples distribution of water body recognition of Poyang Lake.

Fig. 3 Numerical distribution of spectral indices of water pixel and non-water pixel of Poyang Lake. EVI, enhanced vegetation index; NDVI, normalized difference vegetation index; mNDWI, modified normalized difference water index.

Fig. 4 Verification of inundation frequency (IF) accuracy of Poyang Lake.

Fig. 5 Spatial distribution map of inundation frequency (IF) of Poyang Lake from 2000 to 2019.

Fig. 6 Changes in the water area with inundation frequency (IF) of Poyang Lake in the different ranges from 2000 to 2019.

Fig. 7 Spatial and temporal changes of enhanced vegetation index (EVI) of wetland vegetation in Poyang Lake from 2000 to 2019. IF, inundation frequency.

Fig. 8 Change of regional mean enhanced vegetation index (EVI), and water area of high and low inundation frequency (IF) of Poyang Lake from 2000 to 2019.

Fig. 9 Total inundation frequency (IF) of Poyang Lake during 2000-2019.

Fig. 10 Change of average enhanced vegetation index (EVI) in different total inundation frequency (IF) regions of Poyang Lake from 2000 to 2019.

Fig. 11 Relationship between the enhanced vegetation index (EVI) and the total inundation frequency (IF) of Poyang Lake.

Table 2 Pearson correlation coefficient between annual maximum enhanced vegetation index (EVI) and total inundation frequency (IF) of Poyang Lake (2000-2019)

年份 Year	2000	2001	2002	2003	2004	2005	2006	2007	2008	2009
R²	-0.960^**	-0.953^**	-0.933^**	-0.952^**	-0.962^**	-0.958^**	-0.96^**	-0.969^**	-0.972^**	-0.974^**
p	<0.01	<0.01	<0.01	<0.01	<0.01	<0.01	<0.01	<0.01	<0.01	<0.01
年份 Year	2010	2011	2012	2013	2014	2015	2016	2017	2018	2019
R²	-0.870^**	-0.946^**	-0.979^**	-0.938^**	-0.956^**	-0.945^**	-0.943^**	-0.991^**	-0.903^**	-0.927^**
p	<0.01	<0.01	<0.01	<0.01	<0.01	<0.01	<0.01	<0.01	<0.01	<0.01

Fig. 12 Correlation (B) and change trend of enhanced vegetation index (EVI) (A) and inundation frequency (IF) (C) of Poyang Lake.

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