The fitted multivaliate quadratic regression equation can better express the relation between nodulation and nitrogen fixation of alder and physical-chemical factor of the soils.The best mathematical model indicates that soil pH is the main factor affecting nitroge fixation amount.The associated effect of the available phosphorus with available potassium,the CO2 with organic matter,or the CO2 with available molybdenum is the secondary factor.Deficiency of the available phosphorus is the limitation to nitrogen fixation of the alder.The highest N2-fixing capacify of the symbiont occurs in the alluvial soil and yellow earth (except the calcareous parent material); and higher in the purplish soils on Shaximiao parent material,but low in strongly calcareous and acid purplish soil.
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刘国凡,邓廷秀.再论土壤条件与桤木结瘤固氮的关系[J].土壤学报,1987,24(1):59-66. Liu Guofan, Deng Tingxiu. FURTHER STUDY ON INFLUENCE OF SOIL CONDITION ON NODULATION AND NITROGEN FIXATION OF ALNUS CREMASTOGYNE[J]. Acta Pedologica Sinica,1987,24(1):59-66.