NDLI: Effects of willow canopies on plant species performance in a low-alpine community

Content Provider	Springer Nature Link
Author	Totland, Ørjan Esaete, Josephine
Copyright Year	2002
Abstract	It is believed that abiotic, rather than biotic, factors are ofparamount importance to the performance of plants in alpine and arctichabitats.This study examines how Salix lapponum affects 15associated species by comparing individual growth and reproductive performanceof adult plants growing inside and outside shrub canopies. The study alsoincludes experimental removal of Salix lapponum shrubs,andmeasurements of shoot density of five species inside and outside intactcanopies. Mean above-ground plant weight of nine species was significantlyhigher inside canopies compared to outside. Mean leaf number inside canopieswassignificantly higher for two species, and total seed number was significantlyhigher inside for one species. Mean leaf number was significantly lower insidecanopies compared to outside for one species. Mean seed weight wassignificantlylower inside canopies for one species. Removal of Salixlapponum shrubs increased bulbil weight of Bistortavivipara and seed number and plant weight of Euphrasiafrigida. These results suggest that canopy removal relaxedcompetition. Shoot density was substantially higher outside canopies comparedtoinside for four species and slightly higher outside for one species. Soilmoisture, soil organic content, soil pH, and temperature inside canopies werenot significantly different from outside, whereas photosynthetically activeradiation (PAR) was markedly reduced inside canopies. Increased growth insidecanopies is likely a compensatory mechanism to decreased PAR, which enableplants inside canopies to achieve reproductive outputs that equals those onoutside plants. The lower plant density inside canopies is probably caused byreduced germination and establishment possibilities there, due to reduced PARand higher litter accumulation.
Starting Page	157
Ending Page	166
Page Count	10
File Format	PDF
ISSN	13850237
Journal	Plant Ecology
Volume Number	161
Issue Number	2
e-ISSN	15735052
Language	English
Publisher	Kluwer Academic Publishers
Publisher Date	2002-01-01
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Plant Sciences
Content Type	Text
Resource Type	Article
Subject	Ecology Plant Science

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