Diverse Responses of Phenology in Multi-Grassland to Environmental Factors on Qinghai–Tibetan Plateau in China

Studying grassland vegetation growing seasons’ spatial patterns and their environmental controls are crucial to promoting ecological restoration, formulating effective disaster prevention reduction measures building a stable barrier. However, multi-grassland phenological factors different, this has not been well studied before. In paper, the spatiotemporal of start season (SOS) end (EOS) in were investigated using Normalized Difference Vegetation Index (NDVI) on Qinghai–Tibetan Plateau (QTP) from 2000 2019. At same time, we analyzed (including extreme, mean climate, drought, solar radiation, etc.) regulating phenology under ongoing conditions climate change. The results show that SOS appeared first mountain meadow, shrub tussock, temperature steppe desert, then alpine showing significant advancing tendency all types. EOS occurred steppe, shrub-tussock desert. Further analysis indicated reductions annual lowest value daily min (TNN), highest (TNX) dryness index (TVDI), increases maximum consecutive 5‐day precipitation (RX5day) advanced spring phenology, whereas increase radiation (SR) delayed phenology. We also found decrease TVDI TNN yearly (MAT_MEAN), (MAT_MAX) minimum (MAT_MIN) autumn its change rate increased with increasing altitude, respectively.