Analysis of Vegetation Cover Changes in Beijing from 2005 to 2020

doi:10.13466/j.cnki.lyzygl.2023.03.013

Abstract

Abstract:

Based on NDVI data from 2005—2020,the spatial distribution characteristics,temporal distribution characteristics and spatio-temporal characteristics of vegetation were analysed using NDVI classification and difference analysis to reveal the spatio-temporal patterns of NDVI changes in Beijing,and to explore the reasons for the changes by analysing the vegetation cover changes in Beijing in the past 15 years.Through analysis,it is found that,the overall vegetation cover in the Beijing area is at a high level.From a regional perspective,the areas with very high NDVI mean coverage classes in Beijing from 2005 to 2020 were all located in the Jundu and Xishan mountain ranges.The vegetation coverage of Mentougou District,Huairou District,Yanqing District,Fangshan District,Changping District and Pinggu District was at the highest level in Beijing.In terms of time,the level of vegetation coverage changed significantly from 2005 to 2020,with the average annual NDVI value increasing from 0.659 0 to 0.756 6,an increase of 14.81%.The proportion of area with "very high" vegetation coverage increased from 5.31% to 47.79%,and the proportion of area with "low" vegetation coverage decreased from 5.91% to 1.25%.In terms of spatiotemporal change characteristics of vegetation,the area with obvious improvement and slight improvement accounted for more than 80%.Two "million mu afforestation" projects and mountain forest management were the main driving forces to improve the quality of vegetation coverage in Beijing.

Key words: NDVI, vegetation cover, difference analysis, Beijing

CLC Number:

TP79

YU Shiyong, XU Qian, YU Xiaofei. Analysis of Vegetation Cover Changes in Beijing from 2005 to 2020[J]. FOREST RESOURCES WANAGEMENT, 2023, (3): 98-104.

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覆盖等级	NDVI	面积/km²				比例/%
覆盖等级	NDVI	2005年	2010年	2015年	2020年	2005年	2010年	2015年	2020年
极低	[0,0.2)	14.0	9.7	15.5	10.0	0.09	0.06	0.09	0.06
低	[0.2,0.4)	970.1	1 069.8	975.2	205.6	5.91	6.52	5.94	1.25
中	[0.4,0.6)	2 857.6	3 039.8	2 943.2	1 832.7	17.41	18.52	17.94	11.17
高	[0.6,0.8)	11 696.3	11 092.2	6 401.2	6 519.3	71.28	67.59	39.01	39.73
极高	[0.8,1.0]	872.0	1 198.5	6 074.9	7 842.4	5.31	7.31	37.02	47.79

变化等级	2005—2010年		2010—2015年		2015—2020年		2005—2020年
变化等级	面积/km²	比例/%	面积/km²	比例/%	面积/km²	比例/%	面积/km²	比例/%
明显退化	56.0	0.34	162.5	0.99	141.6	0.86	52.8	0.32
轻度退化	1 577.2	9.61	1 425.3	8.69	903.6	5.51	391.6	2.39
基本不变	12 937.2	78.84	5 973.2	36.40	8 246.9	50.26	2 546.4	15.52
轻度改善	1 802.4	10.98	8 356.5	50.92	5 273.5	32.13	10 592.0	64.54
明显改善	37.2	0.23	492.5	3.00	1 844.4	11.24	2 827.2	17.23