摘要
利用2000~2019年4~9月(生长季)MODIS 13Q1的16d合成NDVI数据集与同期气象数据,采用趋势分析法、相对年际变化率、Mann-Kendall突变检验以及相关分析法对科尔沁草原NDVI的变化特征及其与气候因子的响应进行研究。结果表明:1)近20a科尔沁草原年均NDVI具有明显的空间分异特征,主要呈现西中部低,西北部高以及南部较高的空间分布格局;2)2000~2019年科尔沁草原NDVI值以0.045/10a的变化倾向率增加,增加显著的面积占科尔沁草原总面积的68.1%;同时,Mann-Kendall突变检验显示科尔沁草原NDVI在2011年后出现了突变性的上升,增加约0.017;3)科尔沁草原NDVI与气温呈现弱负相关关系,与降水呈现显著正相关关系,进一步对偏相关统计分析得到,NDVI与气温呈负相关的区域约占科尔沁草原总面积的59.03%;与降水呈正相关的区域约占科尔沁草原总面积的96.89%,表明降水对科尔沁草原NDVI的贡献率大于气温的影响。通过构建驱动机制,科尔沁草原生长季NDVI变化总体上受气温降水的共同驱动影响,共同驱动面积约占科尔沁草原总面积的78.6%,其中共同强驱动面积占53.4%。
The NDVI data set and meteorological data(April to September,from 2000 to 2019)were used to analyze the spatial-temporal variation of NDVI and its response to climate factors in Horqin grassland.The results showed that the average annual NDVI of Horqin grassland had specific spatial characteristics with lower value in central western area and higher values in northwestern and southern area.The NDVI of the Horqin grassland was increased by 0.045/10a from 2000 to 2019,in which significantly increased area accounted for 68.1% of the entire area.Moreover,a significant increase(0.017)in NDVI was observed in Horqin grassland after 2011.The relationship between NDVI and temperature was weak negative,while the relationship between NDVI and precipitation was significantly positive.The area with negative correlation between NDVI and temperature accounted for 59.03% of the entire area of Horqin grassland,while the area with positive correlation between NDVI and precipitation accounted for 96.89% of the total area,which indicated that the precipitation had greater contribution to NDVI compared with temperature.Generally,the change of NDVI in the growth season of Horqin grassland was affected by temperature and precipitation acting together.
作者
于静
高亚敏
付铭
YU Jing;GAO Ya-min;FU Ming(Lanzhou Institute of Arid Meteorology,China Meteorological Administration/Key Laboratory of Arid Climate Change and Reducing Disaster of Gansu Province/Key Laboratory of Arid Climate Change and Reducing Disaster of Meteorological Administration,Lanzhou 730020,China;Tongliao Meteorological Bureau,Tongliao 028000,China)
出处
《中国草地学报》
CSCD
北大核心
2020年第6期82-90,共9页
Chinese Journal of Grassland
基金
干旱气象科学研究基金项目(IAM201909)
内蒙古自治区自然科学基金(2018MS04001)。
关键词
NDVI
时空变化
气候响应
科尔沁草原
NDVI
Spatial-temporal variation
Climate response
Horqin grassland
作者简介
于静(1991-),女,内蒙古通辽市人,硕士,主要从事气候变化、陆表蒸散以及干旱监测方面的研究,E-mail:yjarhope@163.com.
