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首页> 外文期刊>Secheresse: Science et Changements Planetaires >Diachronic analysis of land cover in the Gabi District (Maradi region, Niger) and characteristics of vegetation. (Surveillance environnementale a long terme dans les zones arides et semi-arides (Long-term environmental monitoring in arid and semiarid
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Diachronic analysis of land cover in the Gabi District (Maradi region, Niger) and characteristics of vegetation. (Surveillance environnementale a long terme dans les zones arides et semi-arides (Long-term environmental monitoring in arid and semiarid

机译：加比地区（尼日尔马拉迪地区）土地覆盖的历时分析和植被特征。 （长期监测环境和干旱地区的监测环境（干旱和半干旱地区的长期环境监测

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The District of Gabi is located in the Maradi region in the southern central region of the Niger Republic. It covers a surface of 79,052 ha and comprises the principal land reserves and forests of this region. The aims of this work are to analyze the general evolution of land use in the District and to characterize its main particularities affecting the present structure of plant communities. This analysis of land use dynamics requires the interpretation of aerial photographs from 1972 brought up to date by satellite datum from 2005. The study shows the deep transformations that have occurred over the past 31 years in connection with the natural dynamics of the vegetation. This diachronic analysis shows a projection of the same agricultural activities which have resulted in a reduction of the tree savannah/shrub savannah from 31,822 ha in 1972 to 15,667 ha in 2005, a reduction of 20%, accompanied by an extension of the agricultural zones which has passed from 1,690 hectare to 9,042 hectares in 2005, an increase of 9%. The topography and the availability of hydrological resources play an important role in plant community dynamics. Large diameter individuals are thus found mainly in the lower areas where there is a good hydrological state. After this comparative review of the agricultural mechanism of colonization of the tree savannah/shrub savannah, we show the importance of the relationship between vegetation and current environmental risks and the need to produce new indicators for the use of the forest. This study made it possible to characterize the initial situation and to identify the questions which will be deepened by investigations within the framework of the device of long-term monitoring according to the Roselt (Reseau d'observatoires de surveillance ecologique a long terme, Long Term Ecological Monitoring Observatories Network) methodology.
机译：加比区位于尼日尔共和国中南部地区的马拉迪地区。它占地79,052公顷，包括该地区的主要土地储备和森林。这项工作的目的是分析该地区土地利用的总体演变，并表征其影响植物群落当前结构的主要特点。这种对土地利用动态的分析需要对自1972年以来到2005年的卫星数据所产生的航空照片进行解释。该研究表明，过去31年中与植被的自然动态相关的深刻变化。历时分析表明，相同的农业活动也导致树木大草原/灌木大草原的数量从1972年的31822公顷减少到2005年的15667公顷，减少了20％，伴随着农业面积的扩大。从2005年的1,690公顷增加到9,042公顷，增长了9％。地形和水文资源的可用性在植物群落动态中起重要作用。因此，大直径个体主要发现在水文状况良好的较低地区。在对树木大草原/灌木大草原定植的农业机制进行了比较审查之后，我们表明了植被与当前环境风险之间关系的重要性以及需要为森林利用制定新的指标。根据Roselt（Reseau d'observatoires de monitoring ecologique a long terme，长期生态监测天文台网络）方法。

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