Alder (Alnus crispa) effects on soils in ecosystems of the Agashashok River valley, northwest Alaska

被引:62
作者
Rhoades, C
Oskarsson, H
Binkley, D
Stottlemyer, B
机构
[1] Colorado State Univ, Dept Forest Sci, Ft Collins, CO USA
[2] Agr Res Inst, RALA, Reykjavik, Iceland
[3] Colorado State Univ, Dept Forest Sci, Ft Collins, CO 80523 USA
[4] USGS Biol Resources Div, Ft Collins, CO USA
来源
ECOSCIENCE | 2001年 / 8卷 / 01期
关键词
arctic ecosystems; soil nitrogen isotopes; tundra; floodplain;
D O I
10.1080/11956860.2001.11682634
中图分类号
Q14 [生态学(生物生态学)];
学科分类号
071012 ; 0713 ;
摘要
At the northern limit of the boreal forest biome, alder (Alnus crispa [Ait.] Pursh) shrubs occur in a variety of ecosystems. We assessed the effects of individual alder shrubs on soil properties and understory plant tissue nitrogen in floodplain terraces, valley slopes and tussock tundra ridges The three ecosystems differed with respect to soil properties and abiotic conditions and supported distinct plant communities. Alder increased resin-exchangeable soil N and NO3 production significantly in each ecosystem. The greatest difference between alder canopy and surrounding soil NO3 measured both under field and laboratory. conditions occurred in floodplain sires. The shrub effect on soil pH and soil organic matter was greatest on tundra ridges. Alder shrubs also influenced the nitrogen nutrition of plants growing beneath their canopies. Plants growing below older canopies had higher foliar nitrogen concentration and natural abundance N-15 composition and lower carbon to nitrogen ratio than open-grown plants. Similar to soil N availability, understory plant leaf chemistry responded more to alder on floodplains than on slope or tundra ecosystems. This pattern suggests that understory plants rely mure heavily on alder-fixed-N in this resource-poor ecosystem.
引用
收藏
页码:89 / 95
页数:7
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