摘要
基于像元二分模型,利用2000—2019年MODIS NDVI数据以及气象观测数据,以吕梁市为例对黄河中游典型干旱区植被覆盖度进行估算,并采用趋势分析法、相关分析法对其植被覆盖度时空分布特征进行分析,探讨了主要气候因素(气温、降水量)与植被覆盖度的相关关系。结果表明:2000—2019年吕梁市植被覆盖度呈波动增加趋势,2017年达到最大值后在高位波动。植被高覆盖度地区主要分布在吕梁山山区,植被覆盖度增加区域面积占总面积的97.5%,植被覆盖度降低的区域仅占2.5%,植被覆盖度变异系数大的区域主要分布吕梁市西部沿黄河黄土高原丘陵区和东部平川盆地城市周边地区;吕梁市植被覆盖度与降水量、年平均气温均呈正相关关系,植被覆盖度与年平均气温呈正相关、负相关的面积占总面积的83%、17%;植被覆盖度与年平均降水量的正相关、负相关区域分别占总面积的98%、2%。吕梁市植被覆盖度与年平均气温的相关性小于其与年平均降水量的相关性,降水与植被覆盖度的影响较气温密切。
Based on the pixel binary model,MODIS NDVI data and meteorological observation data from 2000 to 2019,Lyvliang City was taken as a case study,and the vegetation coverage(FVC)of typical arid areas in the middle reaches of the Yellow River was calculated.The spatio-temporal distribution characteristics of vegetation coverage were analyzed by the method of trend analysis and correlation analysis,and the correlation between main climatic factors(temperature,precipitation)and vegetation coverage was explored.The results showed that FVC were increasing from 2000 to 2019 and fluctuating at a high level after reaching the maximum value in 2017.The areas with high vegetation coverage in Lyvliang City were mainly distributed in Lyvliang Mountain area,and the increased area of FVC accounted for 97.5%of the total area,the decreased area of FVC accounted for 2.5%.The regions with large coefficient of variation of vegetation coverage mainly spread over the hilly areas of the Loess Plateau along the Yellow River in the west of Lyvliang City and the surrounding areas of the city in the eastern basin.FVC was both positively correlated with precipitation and annual mean temperature in Lyvliang City.The area with positive and negative correlations between vegetation coverage and the annual average temperature accounted for 83%and 17%of the total area,respectively.The area with positive and negative correlations between vegetation coverage and precipitation respectively accounted for 98%and 2%of the total area.The correlation between vegetation coverage and annual average temperature was less than that between vegetation coverage and annual average precipitation in Lyvliang City,and the influence of precipitation was stronger than temperature.
作者
李孟蔚
樊子菡
常清
王大勇
赵永强
米晓楠
杨倩
栾青
LI Meng-wei;FAN Zi-han;CHANG Qing;WANG Da-yong;ZHAO Yong-qiang;MI Xiao-nan;YANG Qian;LUAN Qing(Shanxi Climate Center,Taiyuan 030006,China;Shanxi Forestry and Grassland Engineering Station,Taiyuan 030001,China)
出处
《江西农业学报》
CAS
2023年第1期138-144,共7页
Acta Agriculturae Jiangxi
基金
中国气象局创新发展专项(CXFZ2021J067)
山西省气象局青年基金项目(SXKQNQH20217147)。
