%0 Journal Article
%T STUDIES OF ECOLOGICAL CHARACTERISTICS AND NITROGENASE ACTIVITV OF ROOT NODULES OF ELAEAGNUS MOLLIS DIELS<br>翅果油树的生态学特征及其根瘤固氮活性的研究
%A Du Dazhi
%A <br>杜大至
%J 生态学报
%D 1989
%I 
%X Elaeagnus mollis Diels is a rare oil tree of high economic values in actinorhi-zal plant resources in China. Its ecological characteristics and the relations between ecological factors and the nodular nitrogenase activity were surveyed and studied.Surveying results indicated that the origin of Elaegnus mollis Diels is from warm temperat zone and semi-arid climate zone and it grows in drab soil of low mountain and hilly land. This species is characterised by a high tolerance to drought, cold and barren and a high adaptability. Developing this species in middle reaches of the Yellow River and some Eerious soil erosion regions in China is of high economical and ecological benefits.Research results indicated that the nitrogenase activity of root nodules in Elaeagnus mollis Diels during the growing seasons shows two periods of high rate, the first in June, and the second in September. The seaeonal variations of nitrogenase activity are restricted by ecological factors and metabolic factors of host plant. The influence of temperature on nodular nitrogenase activity is obvious. Photosynthetic intensity is in close relation with nitrogenase activity, but without synchronism. The influence of sexual reproductive growth on nitrogenase activity during different seasons is due to the result of competition for photosynthate allocation between both. Planting Elaeagnus mollis dramatically increased the nitrogen content of soil in woodland. Soil nitrogen contents under 12 year-old artificial forest and 20 year-old artificially transformed forest increased by 75% and 99% over those of natural Vegetation on a waste slope, respectively.
%K Elaeagnus mollis Diels
%K actinorhizal plant
%K nodular njtrogenase activity<br>翅果油树
%K 放线菌
%K 结瘤植物
%K 固氮
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=90BA3D13E7F3BC869AC96FB3DA594E3FE34FBF7B8BC0E591&jid=FE163E5DB2274E5937319DE98913EC37&aid=193CD41145C209ADFFA8014F4DB6ADFD&yid=1833A6AA51F779C1&vid=9CF7A0430CBB2DFD&iid=E158A972A605785F&sid=5DCBAAB000A70168&eid=683005D16807E4FE&journal_id=1000-0933&journal_name=生态学报&referenced_num=14&reference_num=2