Climate-induced abrupt shifts in structural states trigger delayed transitions in functional states

Ecological Indicators
By: , and 

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Abstract

Theoretical models suggest that ecosystems can be found in one of several possible alternative stable states, and a shift in structural stable state (SSS) can trigger a change in functional stable state (FSS). But we still lack the empirical evidence to confirm these states and transitions, and to inform the rates of change. Here, a 30-yr dataset from long-term ungrazed and grazed temperate grasslands was analyzed to determine whether abrupt transitions of SSS and FSS can occur. We found that the long-term ungrazed grassland experienced abrupt transitions in the dominant plant functional type (shift in SSS) that was followed by a transition between carbon sink and source 1–2 year later (shift in FSS). A directional shift in precipitation and temperature accounted for 40% of the variation in the SSS transition, while the SSS transition explained 20% of the variation in the FSS transition. In contrast, no abrupt transitions for SSS and FSS were observed in the long-term moderately grazed grassland. These findings provide important insight into the interacting effects of climate change and livestock grazing on ecosystem transitions in temperate grasslands. Moderate utilization of production in ecosystems that have co-evolved with herbivores can offset structural and functional transitions induced by climate change.

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Additional publication details

Publication type Article
Publication Subtype Journal Article
Title Climate-induced abrupt shifts in structural states trigger delayed transitions in functional states
Series title Ecological Indicators
DOI 10.1016/j.ecolind.2020.106468
Volume 115
Year Published 2020
Language English
Publisher Elsevier
Contributing office(s) Southwest Biological Science Center
Description 106468, 8 p.
Country China
Other Geospatial Xilin River watershed
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