Nitrogen fixation associated with grasses in Oregon.
Nitrogen fixation associated with grasses in Oregon.
复制标题
与俄勒冈州草相关的固氮作用。
DOI：
10.1139/m76-078
复制
发表时间：
1976
影响因子：
2.8
通讯作者：
R. Seidler
中科院分区：
文献类型：
--
作者：
A. D. Nelson;L. E. Barber;J. Tjepkema;S. Russell;R. Powelson;H. Evans;R. Seidler
用乙炔还原法研究了俄勒冈州天然草地和谷类作物的固氮作用。收集到的一些草具有一定的乙炔还原活性。剪股颖比其他物种的活性大得多，平均速率估计为每天每公顷37克N2。假设100天的活动，每年每公顷约固定3公斤的N2。这一数量的氮可能是重要的，在自然条件下维持这一物种。固氮微生物是从一些草的根表面分离出来的。从小麦根中分离出浸软芽孢杆菌、多粘芽孢杆菌和阴沟肠杆菌的培养物，这两种培养物尚未被指定特定的分类学分类。从羊茅属和剪股颖属中分离到固氮芽孢杆菌和革兰氏阴性好氧菌。
Nitrogen fixation associated with both natural grasslands and grain crops of Oregon was studied using the acetylene-reduction assay. A number of the grasses collected has some acetylene-reducing activity. Agrostis tenuis Sibth. had substantially greater activity than any of the other species, with a mean rate estimated at 37 g N2 fixed per hectare per day. Assuming 100 days of activity, about 3 kg of N2 would be fixed per hectare per year. This quantity of nitrogen may be important in the maintenance of this species under natural conditions. Nitrogen-fixing microorganisms were isolated from the root surfaces of some of the grasses. Cultures of Bacillus macerans, Bacillus polymyxa, and Enterobacter cloacoa were isolated from wheat roots as were two cultures which have not been assigned a specific taxonomic classification. Strains of N2-fixing Bacillus species and Gram-negative aerobic bacteria were isolated from Festuca and Agrostis.