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Title (Primary) Mechanisms behind plant diversity effects on inorganic and organic N leaching from temperate grassland
Author Leimer, S.; Oelmann, Y.; Eisenhauer, N.; Milcu, A.; Roscher, C.; Scheu, S.; Weigelt, A.; Wirth, C.; Wilcke, W.;
Journal Biogeochemistry
Year 2016
Department iDiv; PHYDIV;
Volume 131
Issue 3
Language englisch;
POF III (all) T11;
Keywords The Jena Experiment; Biodiversity; DON leaching; Ammonium leaching; TDN leaching; Land-use change
UFZ wide themes RU1
Abstract Higher plant diversity reduces nitrate leaching by complementary resource use, while its relation to leaching of other N species is unclear. We determined the effects of plant species richness, functional group richness, and the presence of specific functional groups on ammonium, dissolved organic N (DON), and total dissolved N (TDN) leaching from grassland in the first 4 years after conversion from fertilized arable land to unfertilized grassland. On 62 experimental plots in Jena, Germany, with 1–60 plant species and 1–4 functional groups (legumes, grasses, tall herbs, small herbs), nitrate, ammonium, and TDN concentrations in soil solution (0–0.3 m soil layer) were measured fortnightly during 4 years. DON concentrations were calculated by subtracting inorganic N from TDN. Nitrogen concentrations were multiplied with modeled downward water fluxes to obtain N leaching. DON leaching contributed most to TDN leaching (64 ± SD 4% of TDN). Ammonium leaching was unaffected by plant diversity. Increasing species richness decreased DON leaching in the fourth year. We attribute this finding to enhanced use of DON as a C and N source and enhanced mineralization of DON by soil microorganisms. An increase of species richness decreased TDN leaching likely driven by the complementary use of nitrate by diverse mixtures. Legumes increased DON and TDN leaching likely because of their N2-fixing ability and higher litter production. Grasses decreased TDN leaching because of more exhaustive
use of nitrate and
water. Our results demonstrate that increasing plant species richness decreases leaching
of DON and TDN.
ID 18412
Persistent UFZ Identifier https://www.ufz.de/index.php?en=20939&ufzPublicationIdentifier=18412
Leimer, S., Oelmann, Y., Eisenhauer, N., Milcu, A., Roscher, C., Scheu, S., Weigelt, A., Wirth, C., Wilcke, W. (2016):
Mechanisms behind plant diversity effects on inorganic and organic N leaching from temperate grassland
Biogeochemistry 131 (3), 339 - 353