Effects of nitrogen supply and irradiance on growth and nitrogen status in the moss Dicranum majus from differently polluted areas

被引:11
作者
Bakken, S [1 ]
机构
[1] Univ Trondheim, Dept Bot, N-7055 Dragvoll, Norway
关键词
Dicranum majus; moss growth; nitrogen supply; irradiance; protein; chlorophyll;
D O I
10.1179/jbr.1995.18.4.707
中图分类号
Q94 [植物学];
学科分类号
071001 ;
摘要
A growth experiment was undertaken to study the effects of nitrogen supply and irradiance on growth and nitrogen status in the moss Dicranum majus Sm. from two areas receiving different amounts of atmospheric nitrogen deposition. Intact samples of D. majus carpets were taken from two Picea abies forests, one located in southern Norway (high-N site) and the other in central Norway (low-N site). The moss carpets were grown for 120 days at three irradiance levels (PPFD: 20, 40 or 80 mu mol m(-2) s(-1)) and sprayed daily with equal amounts of a nutrient solution containing 30, 180 or 330 muM nitrogen as NO3- and NH4+. Concentrations and total amounts of nitrogen, soluble proteins and chlorophyll were highest in moss plants from the high-N site, both at the start and the end of the experiment. The elongation growth was highest at the lowest irradiance level. As total biomass production did not differ between nitrogen and light treatments, moss growth was presumably limited by other factors, even at the lowest supply rates. Concentrations and total amounts of nitrogen increased with increasing nitrogen supply in moss plants from both sites. Accumulated nitrogen was partly stored as protein and chlorophyll. Recycling of nitrogen from old to young tissues is discussed as a possible explanation for the rather low nitrogen demand in D. majus and the persistently higher nitrogen contents in moss plants from the high-N site.
引用
收藏
页码:707 / 721
页数:15
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