干旱区地理2025，Vol.48Issue(10)：1804-1814,11.DOI:10.12118/j.issn.1000-6060.2024.782
宁夏中部荒漠草原防沙治沙区NDVI时空演化特征及其对气候因素的响应
Spatio-temporal evolution characteristics of NDVI and its response to climate factors of desertification prevention and control zone in the desert grasslands of central Ningxia
摘要
Abstract
Vegetation dynamics serve as a critical indicator and regulator of global climate change,particularly in arid and semi-arid ecosystems where ecological fragility exacerbates environmental challenges.The desertifica-tion prevention and control zone in central Ningxia’s desert grasslands is therefore a vital region for understand-ing vegetation-climate feedback mechanisms;as the largest natural pasture in Ningxia,this also holds great signif-icance for vegetation change research.However,the spatiotemporal evolution characteristics of the normalized difference vegetation index(NDVI)under a long-term time series and its response relationships with climate in this region require further investigation.Based on NDVI,temperature,and precipitation data from 2000 to 2022,the spatiotemporal distribution and variation characteristics,future trends,and dynamic stability of vegetation NDVI in the study area are analyzed using models such as Sen+Mann-Kendall trend analysis,Hurst index,coeffi-cient of variation,and partial correlation analysis.In addition,the relationship between NDVI and temperature and precipitation is discussed.The results showed that:(1)From 2000 to 2022,the annual average NDVI value of vegetation in the study area was relatively low and generally followed a fluctuating upward trend(P<0.01),with a spatial distribution that was"low in the east and west,and high in the middle".(2)Areas with significant im-provement in vegetation interannual variation accounted for 39.30%of the study area(P<0.05),whereas areas with significant vegetation degradation only accounted for 1.75%of the study area(P<0.05).The overall vegeta-tion has shown signs of recovery over the past 23 years.(3)In the study area,70.12%of the NDVI in the study ar-ea had a Hurst value less than 0.5 and 29.88%of the NDVI had a Hurst value greater than 0.5.The reverse charac-teristics of NDVI future changes are stronger than the same-directional characteristics;32.64%of the areas are like-ly to improve in the future whereas 57.64%may experience degradation.The overall trend in vegetation develop-ment may be toward degradation,with the main focus on sustained improvement against weakness.(4)Over the past 23 years,the spatial fluctuations in vegetation NDVI have significantly differed,and this generally occurred in a relatively high wave and high fluctuation stage.Vegetation NDVI exhibits both positive and negative correla-tions with temperature but is positively correlated with precipitation,and vegetation growth is more affected by pre-cipitation factors.The research results provide basic data and a scientific reference for vegetation protection and eco-logical security in the desertification prevention and control zone in the desert grasslands of central Ningxia.关键词
植被NDVI/时空演变特征/气温和降水/荒漠草原/防沙治沙区/宁夏中部Key words
vegetation NDVI/spatio-temporal evolution characteristics/temperature and precipitation/the des-ert grasslands/desertification prevention and control zone/central Ningxia引用本文复制引用
张晓东,马风华,赵志鹏,武丹,马玉学,吉卫波,公亮..宁夏中部荒漠草原防沙治沙区NDVI时空演化特征及其对气候因素的响应[J].干旱区地理,2025,48(10):1804-1814,11.基金项目
2023年度宁夏回族自治区青年科技托举人才培养项目 （）
宁夏回族自治区自然科学基金项目(2023AAC03772)资助 （2023AAC03772）
