水土保持研究2024，Vol.31Issue(4)：214-222,232,10.DOI:10.13869/j.cnki.rswc.2024.04.008
基于多时间尺度的黄河流域植被NPP时空特征及其对气候变化的响应
Spatiotemporal Variation of Multiple Time-Scale NPP and Its Response to Climate Change in the Yellow River Basin
摘要
Abstract
[Objective]The aims of this study are to characterize the changes in net primary productivity(NPP)at different time scales,and to reveal the impact of climate factors on vegetation NPP in Yellow River Basin.[Method]The NPP was estimated month by month using the CASA model from 2000 to 2020 based on remote sensing data and meteorological data,and the trend analysis and partial correlation analysis were used to investigate the temporal and spatial variations of NPP and its response to climate factors at annual and seasonal scales.[Results]The annual NPP in the Yellow River Basin showed significant upward trend with a rate of 1.68 g/(m2·a)from 2000 to 2020,and the NPP in the middle reaches was the highest and grew fastest.The summer NPP was the highest and had the fastest growth rate,especially in the middle reaches.Annual NPP was affected by precipitation most widely,accounting for 31.95％of the total area,and precipitation had a longer lag period than temperature and sunshine duration.The relationships between precipitation and NPP in summer and autumn were mainly positive,with a ratio of more than 70％.About 75％of area showed that temperature and sunshine duration positively influenced NPP in winter.[Conclusion]Vegetation NPP in the Yellow River Basin presented obvious spatial heterogeneity and seasonal variation,and the influence of climate factors on vegetation NPP had different lag periods.Therefore,vegetation protection and restoration in the Yellow River Basin should be considered from both spatial and temporal aspects.关键词
植被NPP/多尺度/驱动因子/黄河流域Key words
NPP/multiple time-scale analysis/driving factors/Yellow River Basin分类
农业科技引用本文复制引用
赵金彩,潘涛..基于多时间尺度的黄河流域植被NPP时空特征及其对气候变化的响应[J].水土保持研究,2024,31(4):214-222,232,10.基金项目
国家自然科学基金(42001220) （42001220）
河南师范大学青年科学基金(2021QK24) （2021QK24）
