河西走廊豆科植物结瘤固氮特性初步研究

STUDIES ON THE CHARACTERISTICS RELATED TO SYMBIOTIC NITROGEN FIXATION OF LEGUMES IN HEXI CORRIDOR,GANSU

对甘肃河西走廊栽培和野生豆科植物结瘤及固氮状况进行了调查。栽培豆科植物均能自然结瘤，野生豆科植物种的结瘤率仅50％。该地区豆科植物根瘤大多数圆形、棒状或指状，形状较为规则。栽培植物根瘤多为粉红色，而野生植物多为白色、黄色或棕色。ARA测定表明，25．6％根瘤为无效根瘤。不同种不同地区根瘤固氮活性相差较大，一般活力都较低，乙炔还原活性小1μmolC2H4／gFW·h的占检测样品数的29．9％，最高者仅为28．19μmolC2H4／gFW·h。根瘤固氮活性与寄主生育期、生活习性以及生态条件有关。对河西走廊共生固氮生理生态特性进行了讨论。

The nodulation and nitrogen fixation of major cultivated and wild legumes havebeen studied in Hexi corridor. All of cultivated and 5o% of wild plants can nodulate innature envirement. The shapes of nodules of these plants were circular,ellipse of cudgel,most of cultivated plants were pink and wild were whlte,yellow and brown in colour. 182samples of nodules were detected with the methed of acetylene reduction. 25. 6% ofthese nodules samples were ineffective for nitrogen fixation. The activites of nitrogenfixation in nodules of various region and various species varied greatly and all of themwere low. 29. 9% of them are under 1 μmol C2H2/g FW. h. The highest is only 28.19pmol C2H2/g FW. h. It seems that the nitrogen fixation activity in nodules is related togrowth period, living habits and toleranced to environmental stress of host plants. Thecharacteristics related to symbiotic nitrogen fixation in legumes in Hexi corridor werediscussed.