Above-ground nutrient turnover and net primary production of an evergreen and a deciduous species in a heathland ecosystem.

摘要: (1) Above-ground nutrient turnover and net primary production (NPP) in adjacent wet heathland communities dominated by the evergreen dwarfshrub Erica tetralix deciduous perennial grass Molinia caerulea were studied for two years The Netherlands. (2) was able to achieve a high NPP early spring (March-May), which accounted 28% of total annual NPP. There no winter (October-March). Secondary thickness growth 31-49% evergreen. (4) growing season species lasted from April until September. above-ground 2 1-2 6 times higher than that (5) Leaf litter only occurred during summer. autumn. Life expectancy leaves three as compared with species. (6) reduced losses mainly leaf longevity, relatively low allocation nutrients tissue concentrations. very efficient retranslocation senescing tissues. (7) Retention greater smaller shrub grass. It is suggested there trade-off between these plant characteristics. (8) shown differences productivity may explain replacement heathlands when availability increases.