Spatio-temporal dynamics of vegetation cover in North-West Algeria using remote sensing data

Sitayeb Tayeb, Benabdeli Khéloufi
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引用次数: 1

Abstract

Abstract Land cover change is the result of complex interactions between social and environmental systems which change over time. While climatic and biophysics phenomena were for a long time the principal factor of land transformations, human activities are today the origin of the major part of land transformation which affects natural ecosystems. Quantification of natural and anthropogenic impacts on vegetation cover is often hampered by logistical issues, including (1) the difficulty of systematically monitoring the effects over large areas and (2) the lack of comparison sites needed to evaluate the effect of the factors. The effective procedure for measuring the degree of environmental change due to natural factors and human activities is the multitemporal study of vegetation cover. For this purpose, the aim of this work is the analysis of the evolution of land cover using remote sensing techniques, in order to better understand the respective role of natural and anthropogenic factors controlling this evolution. A spatio-temporal land cover dynamics study on a regional scale in Oranie, using Landsat data for two periods (1984–2000) and (2000–2011) was conducted. The images of the vegetation index were classified into three classes based on Normalized Difference Vegetation Index (NDVI) values and analysed using image difference approach. The result shows that the vegetation cover was changed. An intensive regression of the woody vegetation and forest land resulted in -22.5% of the area being lost between 1984 and 2000, 1,271 km2 was converted into scrub formations and 306 km2 into bare soil. On the other hand, this class increased by around 45% between 2000 and 2011, these evolutions resulting from the development of scrub groups with an area of 1,875.7 km2.
基于遥感数据的阿尔及利亚西北部植被覆盖时空动态
土地覆盖变化是社会系统和环境系统之间复杂相互作用的结果。虽然气候和生物物理现象在很长一段时间内是土地转化的主要因素,但今天人类活动是影响自然生态系统的大部分土地转化的起源。对植被覆盖的自然和人为影响的量化常常受到后勤问题的阻碍,包括:(1)难以系统地监测大面积的影响;(2)缺乏评价这些因素影响所需的比较地点。植被覆盖的多时相研究是测量自然因素和人类活动引起的环境变化程度的有效方法。为此,本工作的目的是利用遥感技术分析土地覆盖的演变,以便更好地了解控制这一演变的自然因素和人为因素各自的作用。利用1984-2000年和2000-2011年两个时期的Landsat数据,对鄂尔多斯地区进行了区域尺度的土地覆盖时空动态研究。基于归一化植被指数(NDVI)值将植被指数图像分为三类,并采用图像差分法进行分析。结果表明,植被覆盖发生了变化。1984 - 2000年期间,由于木本植被和林地的严重退化,该区面积减少了-22.5%,其中1271平方公里变为灌丛,306平方公里变为裸土。另一方面,在2000年至2011年期间,这一类别增加了约45%,这些演变是由于面积为1,875.7平方公里的灌丛群的发展。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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