APPORT DE LA TELEDETECTION ÃƑ€ LANALYSE DES MUTATIONS DU PAYSAGE AGRAIRE DE LA SOUS-PREFECTURE DE SINEMATIALI ENTRE 1988, 1998 ET 2021 (NORD DE LA COTE DIVOIRE)

In Sinematiali, we observe the growth of fruit growing in this area which is traditionally marked by the production of cotton and cereals. This expansion induces a progressive transformation of land use patterns in the agrarian landscape and impacts agricultural practices. The present study is carried out to analyze agrarian changes in the sub-prefecture of Sinematiali between 1988, 1998 and 2021 using remote sensing techniques. From the processing of Landsat 5 TM (1988, 1998) and Landsat 8 OLI-TIRS (2021) satellite images, six (06) land use modes in the agrarian landscape were identified: dense dry forest, Savanna, Culture – Perennial, Bare soil – Place of habitation and Water. Survey data carried out with operators made it possible to analyze the determinants of the evolution of land use patterns in the eponymous sub-prefecture. Thus, from 1988 to 2021, we observe a reduction in the areas of annual cultivation – fallow zones (-43%), dense dry forest (-58.6%) and savannah (-12.6%). On the other hand, the areas occupied by mango and cashew orchards increase from 478.85 ha in 1988 to 5,867.23 ha in 2021, i.e. an annual rate of change of 7.6% and an overall growth rate of 1,125.3%. This dynamic in fruit growing is partly due to the depreciation of profits from the marketing of seed cotton, the improvement in profit margins from the sale of mangoes, cashew nuts and the flexibility of maintenance orchards.

在西纳马蒂亚利（Sinematiali）地区，我们观察到果树种植的扩张态势——该地区传统上以棉花与谷物种植为核心产业。这一扩张推动了农业景观用地格局的逐步转型，并对农业生产活动产生了显著影响。本研究采用遥感技术，对1988年、1998年与2021年三个时间节点下西纳马蒂亚利乡级分区的农业用地变化展开分析。通过对1988年、1998年的陆地卫星5号专题制图仪（Landsat 5 TM）影像以及2021年的陆地卫星8号陆地成像仪-热红外传感器（Landsat 8 OLI-TIRS）影像进行处理，本研究识别出该农业景观内共6类土地利用类型：茂密旱生林、稀树草原、多年生种植区、裸地与聚居地以及水体。通过对种植户开展调研获取的数据集，本研究进一步分析了该同名乡级分区土地利用格局演变的驱动因素。据此，1988年至2021年间，该区域的一年生耕作-休耕区面积减少43%，茂密旱生林面积减少58.6%，稀树草原面积减少12.6%。与之相对，芒果园与腰果园的占地面积从1988年的478.85公顷增长至2021年的5867.23公顷，年变化率达7.6%，总增长率达1125.3%。果树种植的这一扩张态势，部分源于籽棉销售利润的下滑、芒果与腰果销售利润率的提升，以及果园管护工作的灵活性提升。