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Effects of long-term nitrogen addition on phosphorus cycling in organic soil horizons of temperate forests
IVL Svenska Miljöinstitutet.
Vise andre og tillknytning
2018 (engelsk)Inngår i: Biogeochemistry, ISSN 0168-2563, E-ISSN 1573-515XArtikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

High atmospheric nitrogen (N) deposition is expected to impair phosphorus (P) nutrition of temperate forest ecosystems. We examined N and P cycling in organic soil horizons of temperate forests exposed to long-term N addition in the northeastern USA and Scandinavia. We determined N and P concentrations, enzyme activities and net N and P mineralization rates in organic soil horizons of two deciduous (Harvard Forest, Bear Brook) and two coniferous (Klosterhede, Ga°rdsjo¨n) forests which had received experimental inorganic N addition between 25 and 150 kg N ha-1 year-1 for more than 25 years. Long-term N addition increased the activity of phosphatase (? 180%) and the activity of carbon (C)- and N-acquiring enzymes (cellobiohydrolase: ? 70%, chitinase: ? 25%). Soil N enrichment increased the N:P ratio of organic soil horizons by up to 150%. In coniferous organic soil horizons, net N and P mineralization were small and unaffected by N addition. In deciduous organic soil horizons, net N and P mineralization rates were significantly higher than at the coniferous sites, and N addition increased net N mineralization by up to 290%. High phosphatase activities concomitant with a 40% decline in P stocks of deciduous organic soil horizons indicate increased plant P demand. In summary, projected future global increases in atmospheric N deposition may induce P limitation in deciduous forests, impairing temperate forest growth.

sted, utgiver, år, opplag, sider
2018.
Identifikatorer
URN: urn:nbn:se:ivl:diva-3306DOI: 10.1007/s10533-018-0511-5OAI: oai:DiVA.org:ivl-3306DiVA, id: diva2:1554892
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A-rapport, A2494Tilgjengelig fra: 2021-05-17 Laget: 2021-05-17

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