Nutrient dynamics in small mesotrophic fens surrounded by cultivated land : I. Productivity and nutrient uptake by the vegetation in relation to the flow of eutrophicated ground water.

Abstract:

:In a typical Dutch polder landscape the effects of nutrient transport from cultivated grassland to mesotrophic fen communities were studied. In a comparative approach, biomass production and nutrient (N, P and K) uptake were determined monthly in four fens and a hayfield differeing in productivity and species composition. The interstitial ground water was sampled every two weeks for determinations of inorganic nutrient concentrations.The differences in productivity between the fens were clearly reflected in the amount of N, P and K taken up in the above-ground vegetation. N and P proved to be limiting plant growth in the fens, whereas K was the main limiting factor in the hayfield. The ground water welling up from the sandy bottom into the fens proved to be rich in ammonia (3-5 ppm). There are strong indications that this continual seepage leads to a considerable input of N into the fens but not to a higher productivity, as the ammonia is absorbed by the lowermost peat layers covering the sand.At this moment, the differences in productivity between the fens must be caused by differences in the rates of mineralization of the superficial peat layer. The degree of fixation of the floating vegetation mat, determining whether or not low water levels lead to an aerated soil top layer, is important in this respect. Within a period of decades, however, the continuous inflow of ammonia may eventually cause an increase in the productivity and a change in the species composition of the fens.

journal_name

Oecologia

journal_title

Oecologia

authors

Verhoeven JT,van Beek S,Dekker M,Storm W

doi

10.1007/BF00379316

subject

Has Abstract

pub_date

1983-10-01 00:00:00

pages

25-33

issue

1

eissn

0029-8549

issn

1432-1939

pii

10.1007/BF00379316

journal_volume

60

pub_type

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