Nutrient identity modifies the destabilising effects of eutrophication in grasslands

Ecology Letters
By: , and 
Edited by: Josep Penuelas

Links

Abstract

Nutrient enrichment can simultaneously increase and destabilise plant biomass production, with co-limitation by multiple nutrients potentially intensifying these effects. Here, we test how factorial additions of nitrogen (N), phosphorus (P) and potassium with essential nutrients (K+) affect the stability (mean/standard deviation) of aboveground biomass in 34 grasslands over 7 years. Destabilisation with fertilisation was prevalent but was driven by single nutrients, not synergistic nutrient interactions. On average, N-based treatments increased mean biomass production by 21–51% but increased its standard deviation by 40–68% and so consistently reduced stability. Adding P increased interannual variability and reduced stability without altering mean biomass, while K+ had no general effects. Declines in stability were largest in the most nutrient-limited grasslands, or where nutrients reduced species richness or intensified species synchrony. We show that nutrients can differentially impact the stability of biomass production, with N and P in particular disproportionately increasing its interannual variability.

Publication type Article
Publication Subtype Journal Article
Title Nutrient identity modifies the destabilising effects of eutrophication in grasslands
Series title Ecology Letters
DOI 10.1111/ele.13946
Edition Online First
Year Published 2021
Language English
Publisher Wiley
Contributing office(s) Southwest Biological Science Center
Description 12 p.
Google Analytic Metrics Metrics page
Additional publication details