从含钙的到酸性的湿地栖息地营养物可获得性变化：密切关注褐藻,能引起np的增加而不是下降.pdfVIP

Plant Soil DOI 10.1007/s11104-009-9954-8 REGULAR ARTICLE Changes in nutrient availability from calcareous to acid wetland habitats with closely related brown moss species: increase instead of decrease in N and P Annemieke Kooijman Lars Hedenäs Received: 14 January 2009 /Accepted: 26 February 2009 # The Author(s) 2009. This article is published with open access at S Abstract To test whether shifts in nutrient availabil- probably due to lower precipitation of calcium ity from calcareous to mineral-poor habitats could be phosphate. The calcareous habitat of the early wetland a driving force in the evolution of seven closely mosses may thus have been nutrient-poor instead of related wetland brown mosses, we measured soil and nutrient-rich. Adaptation to mineral-poor habitats, vascular plant nutrients and conducted a laboratory probably driven by expansion of mineral-poor wet- incubation experiment with Swedish and some Dutch lands when the boreal zone became colder and wetter, samples, in which net N and P-mineralization, may have been associated with higher availability of respiration and microbial characteristics were mea- ammonium and phosphate. However, this may have sured. In spite of high respiration and microbial N, net stimulated Sphagnum more than brown mosses, N-mineralization appeared to be low for the calcare- which may have been restricted to particular niches ous Palustriella falcata and Scorpidium spp. Net N- with perhaps some nitrification. mineralization significantly increased (and respiration and microbial N decreased) for the mineral-poor Keywords Bryophyte . Nitrogen . Microorganisms . Sarmentypnum exannulatum, Straminergon strami- Mineralizati