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Annals of Botany 82: 893-897, 1998
© 1998 Annals of Botany Company

COMMUNICATION

The Effects of Winter Exposure to Acid Soil Conditions on the Subsequent Survival and Growth of Herbaceous, Forest Perennials: a Preliminary Investigation

URSULA FALKENGREN-GRERUP+,

Department of Plant Ecology, Lund University, Ecology Building, S-223 62, Lund, Sweden

April 15, 1998 ; May 28, 1998 . August 19, 1998 .

ABSTRACT

For many plant species, growth is limited in acid soils, which are characterized by high levels of potentially-toxic elements and low nutrient availability. Although plant-soil interactions are traditionally studied during the growing season, the highest concentrations of toxic elements in the soil may occur during the winter months. The present study investigated the effects of a 3-month exposure to either an acid or a reference soil, at temperatures fluctuating around freezing point, on subsequent survival and growth of eight herbs (Brachypodium sylvaticum, Carex pilulifera, Geum urbanum, Luzula pilosa, Mycelis muralis, Silene dioica, Stellaria nemorum, Veronica officinalis).The plants were exposed to ambient weather conditions from December to March, after which they were replanted in fresh reference soil and transferred to a glasshouse. Their biomass was measured 5 weeks later. The plant species differed in their responses to the soils, in a manner reflecting their natural field distributions. All plants of the most acid-tolerant species survived in both treatments, whereas the more sensitive species showed lower survival rates after growth in the acid than in the reference soil. Similar results were found for the regrowth:C. piluliferaandL. pilosa, the most acid-tolerant species, were unaffected by the soil treatments (ratios between biomass in acid compared to reference soils were 0.8 and 1.1, respectively), whereasG. urbanum, M. muralis, S. nemorumandV. officinaliswere negatively affected (ratios 0.3–0.5). Effects on above- and below-ground biomass were broadly similar. This preliminary evidence indicates that soil chemistry during the winter can be important for both survival and growth during the vegetative period that follows.Copyright 1998 Annals of Botany Company.

Acids soils, toxicity, vascular plants, winter exposure.


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