摘要
利用标准化降水蒸散指数(SPEI)和植被净初级生产力(NPP)遥感数据,采用Sen趋势分析、M-K显著性检验、相关性分析等方法,分析了2000—2020年河北省植被NPP的时空变化及其对干旱的响应特征。结果表明:时间尺度上,河北省植被季节、年NPP均呈上升趋势,其中夏季增长速率最快,夏季和年增长速率分别为2.44 gC·m^(-2)a^(-1)、5.18 gC·m^(-2)a^(-1),不同土地利用类型中草地NPP的增长速率最大。空间尺度上,各季节植被NPP均呈上升趋势,其中春季显著改善区域占比最大。年尺度的河北省植被改善区域占91.3%,表明河北省植被生长整体得到改善。河北省秋季SPEI呈上升趋势,干旱减轻,其他时间呈下降趋势,干旱增强。季节和年尺度上河北省植被NPP与SPEI相关性均以正相关为主,季节植被NPP对干旱的响应程度为夏季>春季>秋季,不同土地利用类型的林地、草地NPP对干旱响应较大。
In this study,uses standardized precipitation evapotranspiration index(SPEI)and remote sensing data of net primary productivity(NPP)of vegetation was used,to analyze the temporal and spatial changes of vegetation NPP in Hebei Province and its response characteristics to drought from 2000 to 2020,employing by using methods such as Sen's trend analysis,Mann-Kendall significance test,and correlation analysis.The results indicated that,on a temporal scale,on the seasonal and annual sacales,NPP of vegetation in Hebei Province shows ed an upward trend,wherein of which the summer increase rate is was the fastest.The summer and annual increase rate respectively were 2.44 gC·m^(-2)a^(-1)and 5.18 gC·m^(-2)a^(-1),respectively.The NPP increase rate of sward NPP iswas the highest among different land use types.On a the spatial scale,The the NPP of vegetation shows showed an upward trend in all seasons,wherein of which the region of significant improvement in spring being was the largest.The vegetation improvement area in Hebei Province on the annual scale accounts accounted for 91.3%,indicating,the vegetation growth has entirety improvement in Hebei Province.In autumn,SPEI of Hebei Province SPEI showsed an upward trend,indicating drought lightenwas migrated.SPEI showed a downward trend and the draught was aggravated.,Othertimes show a downward trend,drought increased,on both seasonal and annual scales,the correlation on the seasonal and annual scale,between vegetation NPP and SPEI of vegetation in Hebei Province iswas mainly positively correlationcorrelated.The responsedegree of NPP of vegetation on the seasonal scale vegetation NPP to drought is was ranked as summer>spring>autumn,NPP of woodlandand sward of different land use types is the greatest in response to drought.
作者
魏丽欣
赵春雷
孟成真
张会
张良玉
WEI Li-xin;ZHAO Chun-lei;MENG Cheng-zhen;ZHANG Hui;ZHANG Liang-yu(Key Laboratory of Baodinglntelligent Ecological Meteorological Intelligent Monitoring&Service in Baoding,Baoding,Hebei 071000,China;Baoding Meteorological Bureau,Baoding,Hebei 0710,China;Hebei Meteorological Science Research Institute,Shijiazhuang 050021,China;Key Laboratory of Meteorology&Ecological Environment of Hebei Province,Shjiazhuang 050021,China)
出处
《四川环境》
2025年第1期41-49,共9页
Sichuan Environment
基金
河北省气象局科技项目(21zc08)
中国气象局创新发展专项(CXFZ2023P021)。
关键词
植被净初级生产力
标准化降水蒸散指数
时空变化
相关性
河北省
Net primary productivity of vegetation
standardized precipitation evapotranspiration index
temporal and spatial change
correlation
Hebei Province
