摘要
目的在全球气候变暖的背景下,研究汉江流域植被生长与气温和降水的时滞累积效应,对流域生态环境建设具有重要的意义。方法基于2001-2020年MODIS NDVI月数据和月均温、月降水数据,通过相关和时滞累积效应分析不同生态分区及植被的生长季NDVI(归一化植被指数)变化差异及其对气温和降水的响应。结果与结论(1)汉江流域生长季NDVI呈波动上升趋势,均值为0.7,与气温和降水的相关系数均值分别为0.263和0.223,正相关区域多分布于生态功能保护区和山地丘陵的植被茂密地带,负相关区域多分布于平原和盆地的栽培植被种植地带及各市人类生产生活区。(2)汉江流域生长季NDVI与气温和降水存在明显的时滞累积效应,受累积1个月滞后0个月-累积3个月滞后3个月影响的植被面积均超过了50%,气温的时滞累积效应由中间向东西两侧递减,降水则自西向东明显增加,气温的时滞累积效应对植被覆盖的促进效果大于抑制效果,降水则相反。(3)6类植被对气温和降水时滞累积的负相关性均减弱。除针叶林和阔叶林外,气温在累积6个月滞后3个月的情况下对其他类型植被覆盖的影响最大,响应程度最高的是低覆盖植被;降水在累积3个月滞后2个月的情况下对6类植被覆盖的影响最大,降水对6类植被的平均最值相关系数大小为草丛>草甸>灌丛>栽培植被>针叶林>阔叶林。
Purposes-To study the time lag accumulation effect of vegetation growth on temperature and precipitation in the Han River Basin in the context of global warming for addressing the ecological environment construction of the basin.Methods-Based on MODIS NDVI monthly data and monthly average temperature and precipitation data from 2001 to 2020,the differences in NDVI(Normalized Difference Vegetation Index)changes during the growth season of different ecological zones and vegetation and their responses to temperature and precipitation are analyzed through correlation and time lag accumulation effect.Results and Conclusions-(1)The NDVI of the Han River Basin shows a fluctuating upward trend during the growth season,with an average of 0.7.The average correlation coefficients between NDVI and the temperature and precipitation during the growth season in the Han River Basin are 0.263 and 0.223,respectively.The areas with positive correlation are mostly distributed in ecological function conservation areas and the areas with dense vegetation in mountainous and hilly areas,while the areas with negative correlation are mostly distributed in the zones where vegetation are cultivated and planted in plains and basins and the production areas and living quarters of human beings in various cities.(2)During the Han River Basin growing season,NDVI and temperature and precipitation have obvious time lag accumulation effect,the vegetation area under the influence of 0-month lag of 1-month accumulation and 3-month lag of 3-month accumulation is more than 50%.The time lag accumulation effect of temperature decreases from the middle to the east and west sides,while precipitation significantly increases from west to east.The time lag accumulation effect of temperature has a greater promoting effect on vegetation coverage than a restraining effect,while precipitation has the opposite effect.(3)The negative correlation between six types of vegetation and the accumulation of temperature and precipitation time lag has weakened.Except for coniferous and broad-leaved forests,the temperature has the greatest impact on the other types of vegetation coverage when accumulated for 6 months with a lag of 3 months,and low vegetation coverage having the highest response degree.Precipitation has the greatest impact on six types of vegetation coverage when accumulated for 3 months with a lag of 2 months.The average maximum correlation coefficient of precipitation on six types of vegetation is grassland>meadow>shrub>cultivated vegetation>coniferous forest>broad-leaved forest.
作者
张婕
张翀
杨雅青
ZHANG Jie;ZHANG Chong;YANG Ya-qing(Shaanxi Province Key Laboratory of Disaster Monitoring and Mechanism Simulation,Baoji University of Arts and Sciences,Baoji 721013,Shaanxi,China)
出处
《宝鸡文理学院学报（自然科学版）》
CAS
2024年第1期49-56,共8页
Journal of Baoji University of Arts and Sciences(Natural Science Edition)
基金
陕西省社会科学基金项目(2020D008)
陕西省自然科学基础研究计划项目(2021JM-513)
陕西省教育厅专项科研计划项目(21JK0477)。
关键词
汉江流域
NDVI
植被类型
生态分区
时滞累积效应
Han River Basin
NDVI(Normalized Difference Vegetation Index)
vegetation type
ecological partition
time lag accumulation effect
