The effect of long-term CO2 enrichment on carbon and nitrogen content of roots and soil of natural pastureland
| Autor: | Manal Al-Traboulsi, Catherine Potvin, Brian J. Wilsey |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
Ecology
010504 meteorology & atmospheric sciences c sequestration co2 enrichment chemistry.chemical_element soil c root c/n 04 agricultural and veterinary sciences General Medicine 01 natural sciences Nitrogen Natural (archaeology) Term (time) chemistry soil n Environmental chemistry 040103 agronomy & agriculture 0401 agriculture forestry and fisheries Environmental science pastureland Carbon QH540-549.5 0105 earth and related environmental sciences |
| Zdroj: | Folia Oecologica, Vol 48, Iss 2, Pp 180-190 (2021) |
| ISSN: | 1338-7014 |
| Popis: | Increasing levels of atmospheric CO2 may change C and N dynamics in pasture ecosystems. The present study was conducted to examine the impact of four years of CO2 enrichment on soil and root composition and soil N transformation in natural pastureland. Plots of open-top growth chambers were continuously injected with ambient CO2 (350 µL L–1) and elevated CO2 (625 µL L–1). Soil cores exposed to ambient and elevated CO2 treatment were incubated and collected each year. Net N-mineralization rates in soil (NH4 +-N plus NO3ˉ–-N), in addition to total C and N content (%) of soil and root tissues were measured. Results revealed that elevated CO2 caused a significant reduction in soil NO3 (P < 0.05), however, no significant CO2 effect was found on total soil C and N content (%). Roots of plants grown under elevated CO2 treatment had higher C/N ratios. Changes in root C/N ratios were driven by changes in root N concentrations as total root N content (%) was significantly reduced by 30% (P < 0.05). Overall, findings suggest that the effects of CO2 enrichment was more noticeable on N content (%) than C content (%) of soil and roots; elevated CO2 significantly affected soil N-mineralization and total N content (%) in roots, however, no substantial change was found in C inputs in CO2-enriched soil. |
| Databáze: | OpenAIRE |
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