NITRATE REDUCTASE-ACTIVITY IN VEGETATION BELOW AN ARCTIC BIRD CLIFF, SVALBARD, NORWAY

被引：40

作者：

ODASZ, AM

机构：

[1] Plant Ecology Department, Institute of Biology and Geology, University of Tromsø, Tromsø

来源：

JOURNAL OF VEGETATION SCIENCE | 1994年 / 5卷 / 06期

关键词：

AMMONIA; GUANO; NITROGEN INDICATION; SOIL NITRATE;

D O I：

10.2307/3236203

中图分类号：

Q94 [植物学];

学科分类号：

071001 ;

摘要：

Vegetated sites below bird-nesting cliffs are uniquely nutrient-rich habitats in the otherwise nutrient-poor arctic environment. Plants from six distinct vegetation zones below such a cliff at 79 degrees N, Svalbard, Norway, were collected for analysis under greenhouse conditions. Leaf nitrate reductase activity (NRA) was analysed in 42 species representing 25 % of the SvaIbard vascular flora. The species mean NRA values ranged from 0.37 to 8.34 mu mols of nitrite ions formed per gram of plant fresh weight per hour. Species in the vegetated zone growing closest to recent guano deposits had the highest NRA values, (mean = 4.47) whereas plants growing farther below the cliff had significantly lower values (mean = 0.55). A similar pattern was detected in a duplicate set of plants induced with 15 mM KNO3; vegetation zone means for NRA ranged from 5.08 to 0.98 mu mols of nitrite ions formed per gram of plant fresh weight per hour. Maximally induced species NRA values were highest in the first zones below the cliff and decreased downslope. This gradient paralleled the steep soil nitrate gradient, which decreased from 13.84 mg/l at the cliff-base to 1.03 mg/l downslope. Correspondingly, soil ammonium ions in the vegetation zones ranged between 1.96 mg/l at the cliff-base to 0.03 mg/l downslope. Correlations between NRA and soil nitrate provide a systematic basis for assigning scalar 'nitrogen figures' as indicators of habitat preference, here for the first time applied to arctic species.

引用

页码：913 / 920

页数：8

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