Low resistance of montane and alpine grasslands to abrupt changes in temperature and precipitation regimes

Arctic, Antarctic, and Alpine Research

Michael Schloter¹  Mohammed A. S. Arfin-Khan²  Pia Eibes²  Bernd Josef Berauer²  Peter A. Wilfahrt²  Andreas Von Heßberg²  Max A. Schuchardt²  Anke Jentsch²  Johannes Ingrisch³ 

[1] Helmholtz Center for Environment and Health;University of Bayreuth;University of Innsbruck;

关键词: alpine;    climate manipulation experiment;    community ecology;    elevational gradient;    grasslands;    resistance;   

DOI  :  10.1080/15230430.2019.1618116

来源: DOAJ

【 摘 要 】

High-elevation ecosystems will experience increasing periods of above-average warmth and altered precipitation changes because of climate change. This causes uncertainties for community properties such as productivity and biodiversity. Increasing temperature may increase productivity by increasing growing season length and metabolic rate or decrease productivity by causing drought stress. Competitive outcomes between species may change with altered climatic conditions, causing shifts in community composition. This study investigates the resistance of aboveground biomass and plant community composition of montane and alpine grassland ecosystems to abruptly altered temperature and precipitation conditions. Intact plant-soil communities were translocated downslope spanning an elevational gradient of 2,090 m in the European Alps. We hypothesize that increasing temperature leads to (1) increased aboveground biomass in the absence of precipitation deficits, (2) decreased species richness, and (3) shifts in plant community composition. After one year of exposure to their new environment, aboveground biomass changes appeared to be dependent on precipitation regimes, whereas species richness declined consistently with changed climatic conditions. No deterministic shift in community composition was found. Abrupt changes in climatic conditions can lead to rapid responses of community properties, indicating that these high-elevation communities may have low initial resistance to future heat waves and droughts.

【 授权许可】

Unknown