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Spatiotemporal analysis of vegetation cover changes around surface water based on NDVI: a case study in Korama basin, Southern Zinder, Niger
Applied Water Science ( IF 5.7 ) Pub Date : 2020-12-07 , DOI: 10.1007/s13201-020-01332-x
Mohamed Adou Sidi Almouctar , Yiping Wu , Amit Kumar , Fubo Zhao , Koroma John Mambu , Mohammed Sadek

In the modern era, vegetation dynamics is an important aspect of climate change studies. The present study examined spatiotemporal changes of (NDVI) normalized difference vegetation index in the Korama basin (Southern Zinder of Niger) from 2000 to 2018, and their correlation with climatic factors was predicted. To analyze the change of vegetation cover, geographical information system, MODIS_NDVI, remote sensing, and climate variables (e.g., temperature and precipitation) datasets were used. Further, the correlation was performed for different years of vegetation types during the growing season (June–October). Our results show an increasing trend in average maximum annual NDVI across the Korama River Basin in the years 2000 and 2018. Conversely, significantly increasing trends in most of the areas were reported. Moreover, in downstream the vegetation cover is increased in Matameye and Magaria, but with a smaller increase in the upstream rate in Mirriah. Furthermore, a decrease in the surface water was observed in the Tessaoua, Matameye, and Magaria sections of the study region in 2000 and 2018, while a rise in water surface area was observed in Matameye and Magaria in the years 2006 and 2012. During rainy and dry seasons, NDVI correlated differently with temperature and precipitation with strong seasonal variations, while the mean vegetation period of NDVI does not show any significant change. In addition, moderate increase was observed in years 2000 and 2012 (r: 0.22; P: 0.50; R2: 0.05; r: 0.31; P: 0.34, R2: 0.10, respectively), and weak decrease in 2006 and 2018 (r: 0.61; P: 0.04; R2: 0.37; r: 0.58; P: 0.06, R2:0.33, respectively). The analysis indicates that climatic parameters such as precipitation and temperature are the main limiting factors affecting the vegetation growth. Indeed, the trends calculated by the correlation analysis showed that as climate factors increased (July, August, and September), the NDVI value increased at a rate of 0.16, reflecting the best growth in vegetation and rise in water bodies, although significantly decreased during years. This study would be highly useful in choice-making for sustainable water resource management in the Korama watershed in Southern Zinder, Niger.



中文翻译:

基于NDVI的地表水周围植被覆盖变化的时空分析:以尼日尔南部辛德勒科拉马盆地为例

在现代时代,植被动力学是气候变化研究的重要方面。本研究调查了2000年至2018年Korama盆地(尼日尔南部)的(NDVI)归一化差异植被指数的时空变化,并预测了它们与气候因子的相关性。为了分析植被的变化,使用了地理信息系统,MODIS_NDVI,遥感和气候变量(例如温度和降水)数据集。此外,在生长季节(6月至10月)对不同类型的植被进行了相关。我们的结果表明,2000年和2018年,整个喀拉马河流域的平均最大NDVI年均呈增加趋势。相反,据报道,大多数地区的NDVI呈显着增长趋势。此外,在下游,Matameye和Magaria的植被覆盖增加,而Mirriah的上游速率增加较小。此外,在2000年和2018年研究区域的Tessaoua,Matameye和Magaria断面地表水减少,而2006年和2012年在Matameye和Magaria的地表水上升。在干旱和干燥季节,NDVI与温度和降水的相关性不同,具有强烈的季节性变化,而NDVI的平均植被期没有显示任何显着变化。此外,在2000年和2012年,观察到适度的增长 2000年和2018年研究区域的Magaria和Magaria剖面,而Matameye和Magaria的水表面积在2006年和2012年观测到上升。在雨季和旱季,NDVI与温度和降水的相关性不同,并且具有强烈的季节性变化, NDVI的平均植被期无明显变化。此外,在2000年和2012年,观察到适度的增长 2000年和2018年研究区域的Magaria和Magaria剖面,而Matameye和Magaria的水表面积在2006年和2012年有所上升。在雨季和旱季,NDVI与温度和降水的相关性不同,且季节变化强烈, NDVI的平均植被期无明显变化。此外,在2000年和2012年,观察到适度的增长(r:0.22; P:0.50; R 2:0.05; r:0.31; P:0.34,R 2:0.10),以及2006年和2018年的疲软下降(r:0.61; P:0.04; R 2:0.37) ;r:0.58;P:0.06,R 2:分别为0.33)。分析表明,降水和温度等气候参数是影响植被生长的主要限制因素。确实,通过相关分析得出的趋势表明,随着气候因子的增加(7月,8月和9月),NDVI值以0.16的速率增加,这反映了植被的最佳生长和水体的升高,尽管在此期间显着下降。年份。这项研究对于尼日尔南部Zinder的Korama流域的可持续水资源管理的选择决策非常有用。

更新日期:2020-12-07
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