内蒙古锡林郭勒草原不同固氮植物的固氮酶活性季节变化  

DETERMINATION OF THE SEASONAL CHANGES OF THE BIOLOGICAL NITROGEN-FIXATION ACTIVITY OF DIFFERENT PLANTS IN THE XILINGOULE GRASSLAND,INNER MONGOLIA

作　　者：关秀清[1] 杜千有[1] 王继伟[1] 

机构地区：[1]中国科学院植物研究所

出　　处：《植物生态学与地植物学学报》1989年第4期387-39,共1页

摘　　要：本文对内蒙古锡林郭勒典型草原栗钙土地带8种植物根瘤固氮酶活性的季节变化进行了测定。结果表明:1.不同种植物固氮酶居性表现了明显的季节性变化,夏季最高,平均值达到529。6n·molC_2H_4/min·g,秋季较低,而春季只有夏季的10%左右。2.不同种植物,其根瘤固氮酶活性变化有不同的特点,杂花苜蓿蓓是8种植物中固氮酶活性一直最高的,而小叶锦鸡儿与沙棘在8种植物中根瘤固氮酶活性一直较低,扁蓿豆,沙打旺前期较低,后期相对较高。3.同种植物在不同季节固氮酶活性表现了明显差别。This paper deals with the determination of the seasonal changes inthe nodule nitrogen-fixation activity of eight species of plants in thechestnut soil zone in the Xilingoule grassland of Inner Mongolia. The re-sults show that mainly due to the changes in temperature and moisturein the soil, the nodule nitrogen-fixing activity of the different plantsshow obvious seasonal changes. The highest takes place in summer, theaverage value being up to 529. 6nmol·C_2H_4/min·g, and the lowest takesplace in autumn, the value in spring being only about 10 percent of thatin summer. Different plants have different characters of nitrogen-fixing activity.Medicago facata has the highest nitrogen-fixing activity among the eightspecies of plants. Trigonella ruthenica and Astragalus absurgens have ratherlow activity at their early stage, becoming relatively high later. Caraganamicrophylla and Hippophae rhamnoides have the lowest nitrogen-fixingactivity among the eight species.

关 键 词：生物固氮 季节变化 固氮酶活性 

分 类 号：Q948.122.2[生物学—植物学]