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Research output: Contribution to Journal/Magazine › Journal article › peer-review
Research output: Contribution to Journal/Magazine › Journal article › peer-review
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TY - JOUR
T1 - Negative effects of nitrogen override positive effects of phosphorus on grassland legumes worldwide
AU - Tognetti, P.M.
AU - Prober, S.M.
AU - Báez, S.
AU - Chaneton, E.J.
AU - Firn, J.
AU - Risch, A.C.
AU - Schuetz, M.
AU - Simonsen, A.K.
AU - Yahdjian, L.
AU - Borer, E.T.
AU - Seabloom, E.W.
AU - Arnillas, C.A.
AU - Bakker, J.D.
AU - Brown, C.S.
AU - Cadotte, M.W.
AU - Caldeira, M.C.
AU - Daleo, P.
AU - Dwyer, J.M.
AU - Fay, P.A.
AU - Gherardi, L.A.
AU - Hagenah, N.
AU - Hautier, Y.
AU - Komatsu, K.J.
AU - McCulley, R.L.
AU - Price, J.N.
AU - Standish, R.J.
AU - Stevens, C.J.
AU - Wragg, P.D.
AU - Sankaran, M.
PY - 2021/7/13
Y1 - 2021/7/13
N2 - Anthropogenic nutrient enrichment is driving global biodiversity decline and modifying ecosystem functions. Theory suggests that plant functional types that fix atmospheric nitrogen have a competitive advantage in nitrogen-poor soils, but lose this advantage with increasing nitrogen supply. By contrast, the addition of phosphorus, potassium, and other nutrients may benefit such species in lownutrient environments by enhancing their nitrogen-fixing capacity. We present a global-scale experiment confirming these predictions for nitrogen-fixing legumes (Fabaceae) across 45 grasslands on six continents. Nitrogen addition reduced legume cover, richness, and biomass, particularly in nitrogen-poor soils, while cover of non-nitrogenfixing plants increased. The addition of phosphorous, potassium, and other nutrients enhanced legume abundance, but did not mitigate the negative effects of nitrogen addition. Increasing nitrogen supply thus has the potential to decrease the diversity and abundance of grassland legumes worldwide regardless of the availability of other nutrients, with consequences for biodiversity, food webs, ecosystem resilience, and genetic improvement of protein-rich agricultural plant species.
AB - Anthropogenic nutrient enrichment is driving global biodiversity decline and modifying ecosystem functions. Theory suggests that plant functional types that fix atmospheric nitrogen have a competitive advantage in nitrogen-poor soils, but lose this advantage with increasing nitrogen supply. By contrast, the addition of phosphorus, potassium, and other nutrients may benefit such species in lownutrient environments by enhancing their nitrogen-fixing capacity. We present a global-scale experiment confirming these predictions for nitrogen-fixing legumes (Fabaceae) across 45 grasslands on six continents. Nitrogen addition reduced legume cover, richness, and biomass, particularly in nitrogen-poor soils, while cover of non-nitrogenfixing plants increased. The addition of phosphorous, potassium, and other nutrients enhanced legume abundance, but did not mitigate the negative effects of nitrogen addition. Increasing nitrogen supply thus has the potential to decrease the diversity and abundance of grassland legumes worldwide regardless of the availability of other nutrients, with consequences for biodiversity, food webs, ecosystem resilience, and genetic improvement of protein-rich agricultural plant species.
KW - Eutrophication
KW - Fabaceae
KW - Legumes
KW - N deposition
KW - Nutrient Network
U2 - 10.1073/pnas.2023718118
DO - 10.1073/pnas.2023718118
M3 - Journal article
VL - 118
JO - Proceedings of the National Academy of Sciences of the United States of America
JF - Proceedings of the National Academy of Sciences of the United States of America
SN - 0027-8424
IS - 28
M1 - e2023718118
ER -