Spatio-temporal change characteristics of vegetation coverage and its relationship with meteorological factors in the Greater Mekong Subregion

doi:10.12302/j.issn.1000-2006.202010020

JOURNAL OF NANJING FORESTRY UNIVERSITY ›› 2022, Vol. 46 ›› Issue (2): 187-195.doi: 10.12302/j.issn.1000-2006.202010020

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Spatio-temporal change characteristics of vegetation coverage and its relationship with meteorological factors in the Greater Mekong Subregion

QIU Fengting¹^,²^,³(), GUO Zhifeng¹, ZHANG Zongke¹^,^*(), WEI Xianhu¹, LI Junjie³, LYU Zheng³

1. Aerospace Information Research Institute, Chinese Academy of Sciences, China-Sri Lanka Joint Center for Water Technology Research and Demonstration by the Chinese Academy of Sciences (CAS), Beijing 100094, China
2. School of Electronic, Electrical and Communication Engineering, University of Chinese Academy of Sciences, Beijing 100049, China
3. China Siwei Surveying and Mapping Technology Co. Ltd., Beijing 100094,China

Received:2020-10-14 Accepted:2021-01-24 Online:2022-03-30 Published:2022-04-08
Contact: ZHANG Zongke E-mail:qiuft@aircas.ac.cn;zhangzk@aircas.ac.cn

Abstract

Abstract:

【Objective】The aim of this reseach is to analyze the temporal and spatial distribution of vegetation coverage in the Greater Mekong Subregion (GMS), and the relationship between vegetation coverage and meteorological factors, so as to provide a theoretical basis for vegetation protection and ecological environment restoration in GMS under the background of global warming environment.【Method】Taking the GMS as the study area, based on MOD13Q1-NDVI data and Google Earth Engine (GEE) platform, the linear regression analysis and Markov model were employed to analyze the spatio-temporal change of its vegetation coverage from 2005 to 2019, and the partial correlation analysis was used to analyze the relationship between vegetation coverage and meteorological factors. 【Result】The 61.9% of the GMS was a high vegetation type, showing the characteristics of low in the north and high in the south, high in the east and low in the west. From 2005 to 2016, the vegetation was improved and mainly the medium-high vegetation transformed to the high vegetation. From 2016 to 2019, the vegetation degraded significantly, and mainly the high vegetation transformed to the low vegetation. In the past 15 years, 12.7% of the area in GMS showed an improvement trend, and 3.0% showed a degradation trend. Based on the overlay analysis of the trend change and Hurst index, the area of significant improvement on vegetation will be greater than a significant degradation in the future, and the vegetation coverage in the south of GMS will be degraded in the future. In terms of an interannual variation trend, normalized vegetation index (NDVI) was significantly positively correlated with temperature, with a correlation coefficient of 0.61, and weakly correlated with precipitation. Spatially, the change of NDVI was affected obviously by temperature and precipitation, and the north was significantly negatively correlated with precipitation, and the south was significantly negatively correlated with temperature.【Conclusion】The vegetation coverage in GMS is good in the whole, and the improvement trend is greater than the degradation. Generally speaking, the vegetation change in GMS is related to temperature and precipitation, especially in the north and south.

Key words: Greater Mekong Subregion(GMS), vegetation coverage, spatial and temporal change, temperature, precipitation

CLC Number:

TP79

QIU Fengting, GUO Zhifeng, ZHANG Zongke, WEI Xianhu, LI Junjie, LYU Zheng. Spatio-temporal change characteristics of vegetation coverage and its relationship with meteorological factors in the Greater Mekong Subregion[J]. JOURNAL OF NANJING FORESTRY UNIVERSITY, 2022, 46(2): 187-195.

Figures/Tables 8

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年份 years	初始类型 initial type	转换占比/% conversion proportion					合计/% total
年份 years	初始类型 initial type	裸地	低	中	中高	高	合计/% total
2005— 2016	裸地	0.64	0.21	—	—	—	0.85
	低	0.15	0.68	0.31	0.08	—	1.22
	中	—	0.30	1.51	1.76	0.19	3.75
	中高	—	0.05	1.00	19.34	13.34	33.73
	高	—	—	0.09	5.39	54.97	60.45
	合计	0.79	1.24	2.91	26.7	68.50	100.00
2016— 2019	裸地	0.61	0.17	—	—	—	0.79
	低	0.13	0.77	0.31	—	—	1.21
	中	—	0.23	1.85	0.80	0.05	2.93
	中高	—	—	1.30	20.70	4.53	26.54
	高	—	—	0.11	10.84	57.58	68.53
	合计	0.74	1.17	3.57	32.34	62.17	100.00

Spatio-temporal change characteristics of vegetation coverage and its relationship with meteorological factors in the Greater Mekong Subregion

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