Correlation Analysis of Normalized Difference Vegetation Index (NDVI) and Climatic Factors in the Vegetative Growing Season in Liaoning Province

doi:10.11983/CBB17010

Abstract

Abstract: Daily data were obtained from 37 meteorological stations in Liaoning province and 5 meteorological stations in an adjacent area, combined with MODIS NDVI data, during 2000-2010. Vegetation growth response to climate change was analyzed by trend, correlation and spatial analyses to investigate the leading influence of different climate factors on vegetation growth. During the study period, the vegetation of Liaoning province was the most vigorous in July and August. NDVI was significantly increased in the vegetative season and remained between 0.73 and 0.74 after 2007. NDVI and temperature were negatively correlated, especially from June to August; NDVI and precipitation and sunshine hours mainly showed a positive correlation. Vegetation growth was most sensitive to changes of temperature, and the response to sunshine hours was the slowest. The main influencing climatic factors were temperature and sunshine hours in May in the eastern part of Liaoning province but changed to precipitation in the western region. During June to August, the main climatic factors were precipitation and sunshine hours but in September, changed to temperature and sunshine hours. The lag time of temperature and sunshine hours to vegetation was extended from the northeast to southwest Liaoning province, and that for precipitation was opposite.

Key words: NDVI, climatic factors, response analysis, lag period

Yongqiang Cao, Liangliang Zhang, Liting Yuan. Correlation Analysis of Normalized Difference Vegetation Index (NDVI) and Climatic Factors in the Vegetative Growing Season in Liaoning Province[J]. Chinese Bulletin of Botany, 2018, 53(1): 82-93.

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URL: https://www.chinbullbotany.com/EN/10.11983/CBB17010

https://www.chinbullbotany.com/EN/Y2018/V53/I1/82

Figures/Tables 10

Figure 1 Distribution of meteorological stations in Liaoning province

Figure 2 Monthly average NDVI (A) and interannual NDVI (B) trend changes in vegetation growing season

Figure 3 Trend change of climatic factors(A) Monthly average temperature in growing season; (B) Mon- thly average precipitation in growing season; (C) Monthly ave- rage sunshine hours in growing season

Table 1 The correlation coefficient grade of temperature and NDVI and its area proportion

Month	The correlation coefficient grade
Month	<-0.68 (%)	-0.68- -0.50 (%)	-0.50-0.50 (%)	0.50-0.68 (%)	>0.68 (%)	<0 (%)	>0 (%)
5	0.03	0.59	83.93	14.93	0.52	52.04	47.96
6	0.15	8.83	91.01	0.00	0.00	99.23	0.77
7	10.65	11.12	78.23	0.00	0.00	96.02	3.98
8	6.00	47.38	46.62	0.00	0.00	99.68	0.32
9	0.00	2.10	97.90	0.00	0.00	69.06	30.94

Figure 4 Spatial distribution of correlation between temperature and NDVI

Figure 5 Spatial distribution of correlation between precipitation and NDVI

Table 2 The correlation coefficient grade of precipitation and NDVI and its area proportion

Month	The correlation coefficient grade
Month	<-0.68 (%)	-0.68- -0.50 (%)	-0.50-0.50 (%)	0.50-0.68 (%)	>0.68 (%)	<0 (%)	>0 (%)
5	1.29	9.47	87.70	1.54	0.00	37.08	62.92
6	0.00	0.57	99.42	0.00	0.00	72.72	27.28
7	0.00	0.80	92.92	6.12	0.15	31.15	68.85
8	0.00	0.00	99.52	0.48	0.00	34.24	65.76
9	0.00	0.00	84.54	13.99	1.47	1.83	98.17

Figure 6 Spatial distribution of correlation between sunshine hours and NDVI

Table 3 The correlation coefficient grade of sunshine hours and NDVI and its area proportion

Month	The correlation coefficient grade
Month	<-0.68 (%)	-0.68- -0.50 (%)	-0.50-0.50 (%)	0.50-0.68 (%)	>0.68 (%)	<0 (%)	>0 (%)
5	0.00	0.12	96.51	3.04	0.33	39.51	60.49
6	0.00	0.00	99.99	0.01	0.00	27.95	72.05
7	0.05	1.17	97.90	0.88	0.00	60.99	39.01
8	0.00	0.01	99.67	0.32	0.00	21.30	78.70
9	0.00	0.85	99.15	0.00	0.00	73.82	26.18

Figure 7 The spatial distribution of lag time for NDVI response to climatic factors(A) Temperature; (B) Precipitation; (C) Sunshine hours

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