黄土高原植被绿化时空变化特征及驱动力分析

Spatiotemporal Variation of Vegetation on the Loess Plateau and the Potential Influencing Factors on Vegetation Trend

研究了黄土高原地区春、夏、秋三季植被绿化的时空变化特征,并进一步分析气候变化驱动因素和人类活动对黄土高原地区植被变化的影响。研究结果表明:黄土高原地区植被NDVI在春、夏、秋三季均呈现明显的增长趋势,且在夏季植被NDVI的增长趋势最为显著。黄土高原地区植被NDVI绿化面积分布广泛,主要集中在中部和东部地区。降水在春、夏两季对黄土高原植被NDVI生长较为显著,而秋季显著影响范围较小。温度对其植被NDVI生长的影响主要在春季。人类活动对黄土高原地区的植被NDVI具有积极的影响,主要得益于生态保护工程的实施。

In this study,the spatial–temporal evolution of the vegetation NDVI during 1999–2019 was analyzed,and the driving forces(including factors of climate and human activities)of the evolution were identified using the partial correlation coefficient analysis and residual analyses.The results showed that the vegetation cover of the Loess Plateau(LP)had exhibited an obvious increasing trend,and the increasing trend was the most significant in summer.The greening area in the Loess Plateau was mainly concentrated in the central and eastern regions.Precipitation had a significant impact on vegetation growth in spring and summer,while it had a small impact in autumn.The effect of temperature on vegetation growth was mainly in spring.Because of the implementation of ecological protection projects,human activities had a positive impact on the vegetation in most areas of the Loess Plateau.