2000-2022年宁夏不同地理分区生长季植被覆盖度时空非平稳性特征OA北大核心CSTPCD

Surface vegetation is an important connecting material between soil,water bodies,and the atmosphere.Studying the spatiotemporal nonstationarity of Fractional Vegetation Cover(FVC)in different geographical regions is of great significance for regional ecological environment protection,planning,and construction.Based on MODIS13Q1 NDVI data and the corresponding meteorological,topographical,soil,and human activity-influencing factors,the spatiotemporal variation characteristics and reasons for FVC in different geographical regions were clarified.The results showed that there were significant differences in FVC among different geographical regions in Ningxia,and that the southern mountainous areas had a good FVC.From 2000 to 2022,Ningxia's FVC showed a fluctuating growth trend,with the southern mountainous areas showing the most significant changes,with an average growth rate of 0.011/a.Analysis of the annual average spatial pattern during the growing season indicates that the high FVC in Ningxia is mainly concentrated in the mountainous areas of Liupan Mountain,the Yellow River Basin,and the Qingshui River Basin.Over the past 23 years,the key areas of low volatility in Ningxia's FVC have been located in Liupanshan,the Shapotou Nature Reserve,Nanhua Mountain,and the urban construction areas in Wuzhong and Yinchuan.The central arid zone showed significantly high volatility,with Theil-Sen Median trend analysis showing a clear growth trend in the southern mountainous areas and a decreasing trend in the Yellow River irrigation areas.The Mann-Kendall significance test showed that the improvement in FVC was more significant as Ningxia moved further south.The Hurst trend further indicates that the southern mountainous areas and Yellow River irrigation areas have highly sustainable characteristics.The high mountain areas in the southern mountainous areas,the Shapotou Nature Reserve west of Ganchengzi,Shitanjing in Helan Mountain,Zhongning County,and Yueyahu Township in Helan County will remain stable in the future.In the Shapotou district,anti-sustainability in the Xiangshan area is significant,and FVC is expected to improve.In some areas of Helan Mountain,the FVC is relatively low and has strong sustainability,which poses the risk of maintaining the current situation.The spatiotemporal nonstationary characteristics of FVC and the influencing factors in different geographical regions of Ningxia were clear.The spatial series regression coefficient indicates that human activities have an important impact on FVC,whereas the time-series regression coefficient indicates that the impact of climatic factors on FVC fluctuates significantly during historical periods.This study provides differentiated strategies for ecological protection,construction,and sustainable development in the different regions of Ningxia.