No slowdown of growing season extension with warming in a permafrost-affected meadow on the Tibetan Plateau

The Tibetan Plateau holds the world’s largest alpine permafrost and is undergoing  an acceleration of warming. Phenological shifts over alpine permafrost in a warmer world have been little studied and are greatly underrepresented in current syntheses. Here, we conducted seasonal and gradient temperature-controlled experiments in a permafrost-affected meadow to evaluate how warming drives shifts in spring and autumn phenology, and associated growing-season length at both community and species levels. Our results showed that there is no sign of slowdown in spring advance with warming under a higher year-around warming treatment, aligning with a future medium warming scenario. This finding can be attributed to the possibility that winter warming is insufficient to reduce chilling accumulation, which would not delay spring phenology and then lead to a non-slowdown in spring phenological advancement. Although spring advance led to an advance in autumn senescence according to spring-only warm..., Experimental design
The manipulative warming experimental platform in typical permafrost-affected region was established in April 2018. Hexagonal open-top warming chambers (OTCs), which were used extensively in the International Tundra Experiment (Wahren et al., 2013), were adopted to simulate the effect of warming on ecosystems. For the low warming gradient, the OTCs are 1.3 m in diameter at the base, 1.1 m in diameter at the top, and 0.4 m high. For the high warming gradient, the OTCs are 1.3 m in diameter at the base, 0.8 m in diameter at the top, and 0.8 m high  (Figure S2). All chambers use the same light panels with 8mm thick and the light transmittance rate > 95%.
There were three warming treatments in our experiment: spring warming (from 10th February to 10th May), winter warming (from 10th November to 10th February) and year-round warming (throughout the whole year), each warming treatment set two warming gradient (40cm and 80cm height OTC, respectively) and four replicates...., , # Data from: No slowdown of growing season extension with warming in a permafrost-affected meadow on the Tibetan Plateau

## Description of the data and file structure

This ReadMe file accompanies the data for the article accepted by the Journal of Ecology.

The data file is named (JEcol_Supplement_Data.xlsx). The data file contains three sheets: 'Climate data','Community Phenology' and 'Species Phenology'.

Abbreviations with simple description as follow, and a full description of these data can be found in sheet \"ReadMe\".

**Worksheet：Climate data**

This sheet contains environment conditons across the study years (more details see method):

season: seasonal mean temperature in a specific season under each treatment, seasons were defined as belows:

winter (from 10th November to 10th February); spring (from 10th February to 10th May); summer (from 10th May to 10th August); autumn (from 10 th August to Novermber).

treatment: there are seven warming treatments in our experiment (more ...