Jukka-Pekka Jäppinen

Ojituksen ja lannoituksen vaikutukset sammalten typpi- ja fosforipitoisuuksiin kahdella suomuuttumalla

Jäppinen J.-P. Ojituksen ja lannoituksen vaikutukset sammalten typpi- ja fosforipitoisuuksiin kahdella suomuuttumalla.

Tiivistelmä

The short-term effects of wood ash, PK and NPK fertilizers on total N and P contents of various mosses at an old drainage area in eastern Finland are studied. Total N contents increased after NPK treatment and total P contents increased after treatments that contained phosphorus (NPK, PK, wood ash). N contents of some mosses also increased after treatments which did not contain any nitrogen (PK and wood ash). On these plots drainage and obviously the fertilizer treatment fastened the decomposition rate of the peat and at the same time the mobilization of the nutrients. On the control plots (no fertilization) the N contents of the mosses did not differ statistically between the years in either of the study sites. The P contents of some mosses decreased on the control plots of the spruce swamp. One reason for this was apparently the level of the ground water, which did not lower so much in the spruce swamp than in the pine mire, and so the mobilization of the nutrients remained smaller. The observed nutrient contents of the peat mosses were much smaller than those of the forest mosses and the nutrient contents were also smaller at pine mire than at spruce swamp. Keywords: bryophytes, fertilization, drained peatlands, nitrogen, phosphorus.

Avainsanat
drained peatlands; bryophytes; fertilization; nitrogen; phosphorus.

Vastaanotettu 31.10.2017 Julkaistu 1.1.1987

Katselukerrat 2048

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