摘要
基于2001-2020年海南岛MODIS NDVI数据及18个市县气温、降水数据,采用Mann-Kendall突变检验、一元线性拟合、相关分析等方法,研究了海南岛近20年植被覆盖时空变化特征及其对气候的响应。结果表明:海南岛县(市)域2001-2020年平均NDVI最大值位于白沙,最小值位于海口,各地区域NDVI值以增长趋势为主,全岛平均NDVI增长趋势在2012年前后发生突变,而后增长速度明显加快。季节平均NDVI值以琼中、五指山、白沙的较高,海口、文昌、东方的较低,全岛平均NDVI值夏季的最高;近20年来各季节NDVI值呈增长趋势,冬季的增幅最大,秋季的增幅最小。全岛月NDVI值8月的最大,2月的最小;近20年来各月NDVI值都呈增长趋势,12月的增长趋势最大,11月的最小。全岛平均NDVI的年际变化主要受气温的影响,与降水无显著相关;全岛平均NDVI的月际变化同时受气温和降水的影响,且气温的影响更为显著,NDVI值对前1个月气温的响应最强,与当月降水的相关性最高,大多数地区NDVI值与前1个月气温、当前月降水呈显著正相关。
Based on MODIS NDVI data,temperature and precipitation data of 18 cities and counties in Hainan Island from 2001 to 2020,the spatio-temporal variation of vegetation coverage and its response to climate in Hainan Island over the past 20 years are studied by Mann-Kendall mutation test,univariate linear fitting and correlation coefficient analysis.The results are as follows:During 2001—2020,the maximum value of annual average NDVI is located in Baisha and the minimum value is in Haikou.The regional NDVI value is mainly in an increase trend,and the average NDVI growth trend of the whole is-land mutated around 2012,and then the growth rate accelerated significantly.The high value of seasonal average NDVI is located in Qiongzhong,Wuzhishan and Baisha,while the low value is in Haikou,Wen-chang and Dongfang.The average NDVI value of the whole island is highest in summer,and all seasons share an increasing trend of average NDVI in recent 20 years,with the largest increase in winter and the smallest increase in autumn.The monthly average NDVI value is largest in August and smallest in Febru-ary,and that of all the months in recent 20 years shows an increasing trend with largest increase in De-cember and smallest increase in November.The inter-annual variation of average NDVI is mainly affected by temperature and has no significant correlation with precipitation.The monthly variation of average ND-VI is influenced by both temperature and precipitation,of which temperature performs more significantly.The monthly average NDVI value of the whole island has the strongest response to the previous month’s temperature and is highly correlated to the current month’s precipitation.The NDVI value of most areas presents a significant positive correlation with the temperature of the previous month and the precipitation of the current month.
作者
杨静
张亚杰
张明洁
张京红
Yang Jing;Zhang Yajie;Zhang Mingjie;Zhang Jinghong(Hainan Climate Center,Haikou 570203,China;Key Laboratory of South China Sea Meteorological Disaster Prevention and Mitigation of Hainan Province,Haikou 570203,China)
出处
《气象与环境科学》
2024年第2期46-53,共8页
Meteorological and Environmental Sciences
基金
海南省科技专项资助(ZDYF2022SHFZ036)
海南省气象局系统建设项目(HNQXXT202302)
海南省气象局技术提升项目(HNQXJS202305)。
关键词
海南岛
NDVI
植被气候关系
Hainan Island
NDVI
vegetation-climate relationship
