2001—2020年埃及植被生长状况时空变化特征

doi:10.11707/j.1001-7488.LYKX20210566

摘要/Abstract

摘要：

目的: 深入研究埃及近20年来植被生长状况时空变化特征，为系统评价埃及的荒漠化防治成果和促进埃及经济和社会可持续发展提供科学依据。方法: 基于2001—2020年MODIS-EVI数据，采用时间序列谐波法进行数据重构，选择趋势分析、变异系数和Hurst指数等对埃及近20年来植被生长状况时空特征及其未来变化趋势进行分析。结果: 1）埃及年内植被生长曲线呈现双波峰特征，近20年来埃及植被生长状况趋于改善，增强型植被指数年均增速为0.000 31；2）埃及植被生长状况稳定区面积占总面积的93.21%，主要分布在西部、中部和南部等大部分地区；植被生长状况改善区面积占总面积的4.79%，主要分布在西北沿海和尼罗河三角洲东西部；植被生长退化区面积占总面积的2.00%，主要分布在尼罗河三角洲中部地区；3）近20年来埃及植被生长变异系数相对较低，尼罗河三角洲以及尼罗河沿岸地区植被生长变化波动相对明显；4）埃及未来植被生长的反向变化特征强于同向变化特征，植被未来改善区面积占总面积的3.74%，未来退化区面积占总面积的3.05%。结论: 近20年来埃及荒漠化防治取得显著成效，植被生长状况总体趋于改善，且未来表现为一定可持续性。

关键词: 植被指数, 时空变化, 变异系数, Hurst指数, 埃及

Abstract:

Objective: In order to scientifically evaluate the results of desertification prevention and control in Egypt, in-depth study of the temporal and spatial characteristics of vegetation growth in Egypt in the past 20 years, and at the same time provide a scientific basis for the systematic evaluation of Egypt’s desertification prevention and control and sustainable development. Method: Based on MODIS-EVI data from 2001 to 2020, the harmonic analysis of time series is used to reconstruct the data, trend analysis, coefficient of variation and Hurst index were used for the analysis of temporal and spatial characteristics of vegetation growth in Egypt in the past 20 years and its future trends. Result: 1） The growth curve of vegetation in Egypt during the year is characterized by double peaks. In the past 20 years, vegetation growth in Egypt has tended to improve, with the average growth rate of EVI being 0.000 31?a^?1. 2） The areas with stable vegetation growth in Egypt accounted for 93.21% of the total area, mainly distributed in most areas of western, central, and southern Egypt; the areas with improved vegetation growth accounted for 4.79% of the total area, mainly distributed in the northwest coast of Egypt, east and west of the Nile Delta Department; the areas with decreasing vegetation growth accounted for 2.00% of the total area, mainly distributed in the central part of the Nile Delta. 3） The coefficient of variation of vegetation growth in Egypt has been relatively low in the past 20 years, while the fluctuations in vegetation growth in the Nile Delta and the Nile River coast areas are relatively obvious. 4） The reverse changes of future vegetation growth in Egypt are stronger than the changes in opposite direction. The area of vegetation improvement in the future will account for 3.74% of the total area, and the area of vegetation degraded in the future will account for 3.05% of the total area. Conclusion: In the past 20 years, Egypt has made remarkable achievements in the prevention and control of desertification. The growth of vegetation tends to improve in general, and it will show a certain degree of sustainability in the future.

Key words: vegetation index, spatiotemporal variations, coefficient of variation, Hurst index, Egypt

中图分类号:

S718.54
TP79

何晨阳,闫峰,卢琦,焦岩. 2001—2020年埃及植被生长状况时空变化特征[J]. 林业科学, 2023, 59(3): 65-72.

Chenyang He,Feng Yan,Qi Lu,Yan Jiao. Characterization of Spatiotemporal Variations in Vegetation Growth in Egypt in 2001—2020[J]. Scientia Silvae Sinicae, 2023, 59(3): 65-72.

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编号 No.	等级Level	面积Area/ km²	比例 Proportion (%)
?5	特重度波动退化区	6 049.50	0.68
?5	Extremely severe fluctuation degradation area	6 049.50	0.68
?4	重度波动退化区	4 412.63	0.50
?4	Severe fluctuation degradation area	4 412.63	0.50
?3	中度波动退化区	5 417.00	0.61
?3	Moderate fluctuation degradation area	5 417.00	0.61
?2	轻度波动退化区	1 538.43	0.17
?2	Mild fluctuation degradation area	1 538.43	0.17
?1	正常波动退化区	245.63	0.03
?1	Normal fluctuation degradation area	245.63	0.03
0	稳定区	823 189.81	93.21
0	Stable area	823 189.81	93.21
1	正常波动改善区	781.56	0.09
1	Normal fluctuation improvement area	781.56	0.09
2	轻度波动改善区	2 333.44	0.26
2	Mild fluctuation improvement area	2 333.44	0.26
3	中度波动改善区	6 352.00	0.72
3	Moderate fluctuation improvement area	6 352.00	0.72
4	重度波动改善区	4 754.44	0.54
4	Severe fluctuation improvement area	4 754.44	0.54
5	特重度波动改善区	28 105.38	3.18
5	Extremely severe fluctuation improvement area	28 105.38	3.18

斜率 Slope (S)	H<0.5	H>0.5
S<?0.001	由退化到改善From degradation to improvement	持续退化Sustained and degradation
?0.001≤S≤0.001	持续稳定Sustained and stable	持续稳定Sustained and stable
S>0.001	由改善到退化From improvement to degradation	持续改善Sustained and improvement

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