Initial biochar effects on plant productivity derive from N fertilization
| Autor: | T. Martijn Bezemer, Simon Jeffery, Liesje Mommer, Jan Willem van Groenigen, Sian Jones, Edward Hodgson, Ilse Memelink, Tess F. J. van de Voorde |
|---|---|
| Přispěvatelé: | Terrestrial Ecology (TE) |
| Jazyk: | angličtina |
| Rok vydání: | 2017 |
| Předmět: |
Restoration ecology
Amendment Stable-isotope probing Soil Science Plant Ecology and Nature Conservation Plant Science 010501 environmental sciences Raw material 01 natural sciences Lolium perenne Human fertilization C dynamics Botany Biochar Incubation Bodembiologie 0105 earth and related environmental sciences Stable isotopes biology Chemistry food and beverages 04 agricultural and veterinary sciences Soil Biology biology.organism_classification PE&RC N immobilisation Greenhouse gases Agronomy international 040103 agronomy & agriculture 0401 agriculture forestry and fisheries Plantenecologie en Natuurbeheer Organic amendment Pyrolysis |
| Zdroj: | Plant and Soil 415 (2017) 1-2 Plant and Soil, 415(1-2), 435-448 Plant and Soil Plant and Soil, 415(1-2), 435-448. Springer Netherlands |
| ISSN: | 0032-079X 1573-5036 |
| Popis: | Background and aimBiochar application to soil is widely claimed to increase plant productivity. However, the underlying mechanisms are still not conclusively described. Here, we aim to elucidate these mechanisms using stable isotope probing.Methods We conducted two experiments with uniquely double-labelled (15N and 13C) biochar and its feedstock (residue), applied separately at 15 Mg ha−1. Both experiments contained three treatments: biochar amendment (Biochar), unpyrolysed residue amendment (Residue) and a no addition control (Control). Experiment I was a 119 day pot experiment seeded with Lolium perenne. Experiment II was a 71 day incubation experiment without plants in which CO2 and N2O fluxes were measured.Results Both Biochar and Residue significantly increased aboveground productivity compared to Control (140% and 160%, respectively). Initial N immobilisation was stimulated in Residue, whereas not in Biochar. 13C–CO2 analysis confirmed that biochar was significantly more recalcitrant than residue. 15N analysis showed that 2% and 0.3% of grass N was derived from the amended material in Residue and Biochar, respectively.ConclusionsOur results suggest that biochar-induced yield increases derive from a combination of reduced N immobilization and a moderate N fertilization effect. Although in the short term biochar might offer benefits compared to residue incorporation, it is unlikely that biochar yield gains will be sustainable for the decades to centuries that biochar C can be expected to reside in soil. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full text from SpringerLink