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The Sensitivity of Moss-Associated Nitrogen Fixation towards Repeated Nitrogen Input
Ansvarlig organisasjon
2016 (engelsk)Inngår i: PLOS ONE, E-ISSN 1932-6203, Vol. 11, nr 1Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

Nitrogen (N(2)) fixation is a major source of available N in ecosystems that receive low amounts of atmospheric N deposition. In boreal forest and subarctic tundra, the feather moss Hylocomium splendens is colonized by N(2) fixing cyanobacteria that could contribute fundamentally to increase the N pool in these ecosystems. However, N(2) fixation in mosses is inhibited by N input. Although this has been shown previously, the ability of N(2) fixation to grow less sensitive towards repeated, increased N inputs remains unknown. Here, we tested if N(2) fixation in H. splendens can recover from increased N input depending on the N load (0, 5, 20, 80, 320 kg N ha(-1) yr(-1)) after a period of N deprivation, and if sensitivity towards increased N input can decrease after repeated N additions. Nitrogen fixation in the moss was inhibited by the highest N addition, but was promoted by adding 5 kg N ha(-1) yr(-1), and increased in all treatments during a short period of N deprivation. The sensitivity of N(2) fixation towards repeated N additions seem to decrease in the 20 and 80 kg N additions, but increased in the highest N addition (320 kg N ha(-1) yr(-1)). Recovery of N in leachate samples increased with increasing N loads, suggesting low retention capabilities of mosses if N input is above 5 kg N ha(-1) yr(-1). Our results demonstrate that the sensitivity towards repeated N additions is likely to decrease if N input does not exceed a certain threshold.

sted, utgiver, år, opplag, sider
2016. Vol. 11, nr 1
HSV kategori
Identifikatorer
URN: urn:nbn:se:polar:diva-3508DOI: 10.1371/journal.pone.0146655OAI: oai:DiVA.org:polar-3508DiVA, id: diva2:1083489
Merknad

26731691[pmid]; PONE-D-15-47639[PII]

Tilgjengelig fra: 2017-03-21 Laget: 2017-03-21 Sist oppdatert: 2021-06-14

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