Changes of phenological sequence of Potentilla saundersiana and its frost resistance under the scenarios of warming and increasing precipitation
Aims Qingzang Plateau is experiencing rapid climate change,including warming,wetting and frequent extreme weather events,however,we know less about the effects of these climate changes on alpine plants.Methods We observed six phenological sequences of Potentilla saundersiana under simulating multi-level warming and precipitation changes,in 2016 through 2018.Then,by simulating seven different extreme cooling extents,we determined the frost resistance of P.saundersiana,and calculated its safety margin in the growing seasons during the experiment period.Important findings Warming(1 ℃ and 2 ℃)and precipitation increase(50％)had limited effects on the phenological sequences of P.saundersiana.But when temperature increased by 4 ℃,first leafing day was significantly delayed,while first flowering day was significantly advanced.The frost resistance(LT50)of P.saundersiana was(-4.76±4.28)℃,and the safety margin against frost damage was negative in 34％of months of the growing season during 2011-2022,and most of them occurred in May and September,indicating high risk of extreme frost in the early and late growing season.These results revealed the effects of multi-level warming and increased precipitation on the phenological sequences of P.saundersiana,clarified the resistance of P.saundersiana to extreme cooling events,and provide insight into predicting the response of alpine plants to climate change in the future on the Qingzang Plateau.
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