生态环境学报2026，Vol.35Issue(5)：679-690,12.DOI:10.16258/j.cnki.1674-5906.2026.05.002
中国草地峰值物候特征时空变化及其影响因素分析
Spatiotemporal Variation of Peak Phenology Metrics in China's Grasslands and Analysis of Influencing Factors
摘要
Abstract
Grassland ecosystems constitute a vital component of China's terrestrial ecosystems,playing an irreplaceable role in maintaining ecological balance and functionality.This study focuses on China's grassland ecosystems and systematically investigates the spatiotemporal evolution patterns of the Peak of Growing Season(POS)and maximum gross primary productivity(GPPmax),using the GOSIF GPP dataset from 2000 to 2022.Furthermore,we comprehensively examine their response mechanisms to the Start of Growing Season(SOS)and climatic factors(temperature and precipitation).The results demonstrated that during the study period,the entire study area exhibited a non-significant advancing trend in POS at a rate of 0.3 days/decade,while GPPmax showed a significant increasing trend with a slope of 0.029 g∙m-2∙d-1(in terms of carbon,the same below)per year.Spatially,approximately 55.84%of the pixels displayed an advancing POS trend(22.40%being statistically significant),and about 78.85%of the area exhibited increasing GPPmax trends(33.31%being statistically significant).Regarding the driving factors,SOS emerged as the dominant factor influencing POS trends,with its impact significantly surpassing that of climatic factors.This finding highlights the crucial role of vegetation's intrinsic rhythmic linkage effects on subsequent growth.The primary controlling factors of GPPmax exhibited distinct regional heterogeneity:SOS was the main regulator in western arid/semi-arid regions,temperature dominated on the Tibetan Plateau,while precipitation primarily controlled GPPmax in eastern arid regions.These findings underscore that future research on global carbon cycles and vegetation phenological changes must simultaneously consider the dual influences of climatic factors and biological rhythms.关键词
草地生态系统/植被物候/总初级生产力最大值(GPPmax)/时空变化/驱动因子Key words
grassland ecosystems/vegetation phenology/maximum gross primary productivity(GPPmax)/spatiotemporal variation/driving factors分类
农业科技引用本文复制引用
陈煖杏,向云燕,廖敬,杨元征,俎佳星..中国草地峰值物候特征时空变化及其影响因素分析[J].生态环境学报,2026,35(5):679-690,12.基金项目
国家自然科学基金项目(42001216) （42001216）
