EFFECTS OF O2 ON AMMONIUM UPTAKE AND ROOT RESPIRATION BY SPARTINA ALTERNIFLORA
EFFECTS OF O2 ON AMMONIUM UPTAKE AND ROOT RESPIRATION BY SPARTINA ALTERNIFLORA
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DOI：
10.1002/j.1537-2197.1984.tb14164.x
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发表时间：
1984-08
影响因子：
3
通讯作者：
J. Morris;J. Dacey
中科院分区：
文献类型：
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作者：
J. Morris;J. Dacey
以前的研究发现互花米草的生长受氮的限制，并与沉积物的氧化还原电位相关。在这项研究中，我们调查了这两个因素之间可能存在的联系。我们已经发现，在短S中，内部°2运输不足以饱和NH 4+吸收。水培互花米草。NH_4 ~+吸收速率和根系呼吸速率对根际~（2+）浓度非常敏感，在~（2+）浓度为5%时达到饱和。在厌氧条件下，NH_4 ~+吸收速率至少在4小时内持续下降。植物的无氧速率的NH 4+吸收和根呼吸的植物之间的变化显着相关的CH 4示踪气体的扩散速率从叶到根的个别植物。互花米草是北美沿着大西洋海岸盐沼的主要水生植物。本种生长在接近潮汐小溪的沼泽地区的单一栽培中。生产力和高度都有显著的下降。随着距离的增加，
Previously the growth of Spartina alterniflora has been found to be limited by nitrogen and correlated with sediment redox potential. In this study we have investigated a possible connection between these two factors. We have found that internal °2 transport is insufficient to saturate NH4+ uptake in short S. alterniflora in hydroponic culture. Rates of NH4+ uptake and root respiration were very sensitive to °2 concentration in the rhizosphere, saturating at about 5% °2- Ammonium uptake continued at a reduced rate for at least 4 hr under anaerobic conditions. Plant to plant variations in anaerobic rates of NH4+ uptake and root respiration were significantly correlated to the diffusion rate of CH4 tracer gas from the leaves to the roots of individual plants. SPARTIXA ALTERNIFLORA Loisel. is the dominant macrophyte in salt marshes along the Atlantic Coast of North America. This species grows in a nearly pure monoculture in areas of marsh adjacent to tidal creeks. There is a striking decrease in the productivity and height of s. alterniflora with increasing distance from