Effect of seasonal snow on the start of growing season of typical vegetation in Northern Hemisphere

Abstract

Under global warming, seasonal snow takes faster melting rate than before, which greatly changes the hydrological cycle. In this study, by targeting three typical seasonal snow-covered land types (i.e., open shrubland, evergreen needleleaf forest and mixed forest) in the Northern Hemisphere, the start of growing season (SGS) has been found obviously advanced in the past years, greatly contributed by the faster melting rate of seasonal snow. It is manifested that significantly positive correlation has been found between SGS and May snow depth for open shrubs, March and April snow depth for evergreen needleleaf forests and March snow depth for mixed forests. However, such close association is not appeared in all the climate conditions of same vegetation. In the future, as the rate of melting snow becomes faster in the high emission of greenhouse gasses than the current situation, continuously advanced SGS will accelerate the change of vegetation distribution in the Northern Hemisphere. These findings offer insights into understanding the effect from seasonal snow on vegetation and promote the sustainable utilization of regional vegetation in the Northern Hemisphere.

Keywords

Vegetation distribution / Start of growing season (SGS) / Snow depth / Climate condition / Northern hemisphere (NH)

Declaration of Competing Interest

The authors declare that there is no conflict of interest.

Acknowledgments

This work is supported by the National Natural Science Foundation of China (Grant No. 42041004 and 41991231), the “Innovation Star” Project for Outstanding Postgraduates of Gansu Province (Grant No. 2022CXZX-107), and the Central Universities (Grant No. lzujbky-2019-kb30).

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