Nitrogen Fixation in Canadian Precambrian Shield Lakes
Nitrogen Fixation in Canadian Precambrian Shield Lakes
复制标题
加拿大前寒武纪地盾湖的固氮
DOI：
10.1139/f80-064
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发表时间：
1980
影响因子：
2.4
通讯作者：
N. E. Campbell
中科院分区：
文献类型：
--
作者：
R. J. Flett;D. Schindler;R. D. Hamilton;N. E. Campbell
在实验湖区的几个人工富营养化湖泊的水柱中的乙炔还原试验表明，固氮的浮游蓝绿藻可以提供一个显着的一部分，这些湖泊的氮收入。在原位15 N2吸收实验在一个湖泊表明，固氮进行缓慢的速度在低氧区的温跃层，可能是通过甲烷氧化细菌。在贫营养湖泊的沿岸的沉积物中的其他15 N2吸收实验未能检测到固氮。一般来说，藻类固氮发生在盾湖，总氮：总磷负荷比（重量/重量）小于约10。这表明，在这些湖泊中，从负荷中去除磷是减轻富营养化的最佳技术，而脱氮，当单独应用时，可能是有害的，因为它会促进固氮蓝藻的水华形成。
Acetylene reduction assays in the water columns of several artificially eutrophied lakes in the Experimental Lakes Area revealed that nitrogen fixation by planktonic blue-green algae could supply a significant portion of the nitrogen income to these lakes. In situ 15N2 uptake experiments in one lake indicated that nitrogen fixation was proceeding at a slow rate in the low oxygen region of the thermocline, probably via methane oxidizing bacteria. Other 15N2 uptake experiments in the littoral sediments of an oligotrophic lake failed to detect nitrogen fixation. Generally, algal nitrogen fixation occurred in Shield lakes that were subject to total N:total P loading ratios (wt/wt) of less than approximately 10. This suggests that in these lakes phosphorus removal from loading is the best technique for eutrophication abatement and that nitrogen removal, when applied by itself, may be detrimental because it could encourage bloom formation of nitrogen fixing blue-green algae.Key words: nitrogen fixation, eutroph...