【摘要】 根据36种土壤上桤木(Alnus cremastogyne)盆栽试验的结果,用多元二次回归方程拟合,通过微电脑运算,探讨了幼苗生长与13项土壤理化因素的关系。阐明影响桤苗生长的主要因素是有效磷和酸度。其次是全氮、有机质和碳酸钙三因素分别与有效钼的联合效应。根据苗高对土壤生产性的预测,多数黄壤、潮土和飞仙关母质紫色土上桤苗生长最佳;沙溪庙母质紫色土亦普遍良好;而酸性和强碱性、强钙质土则生产力低。更多还原

【Abstract】 The fitted multivariate quadratic regression equation can better express the relation of seedling growth of the alder to physical-chemical factor of the soils. The best mathematical model indicates that the available phosphorus and pH are main factor of influence on the seedling growth. Its secondary factors are associative effect of tctal N, organic matter and CaCO3 with available molybdenum respectively. The regression equation can be applied to calculation of the seedling growth. Its regression as index of land evaluation shows that the splended growth occurs on most yellow soils, alluvial soil and feixianguan purplish soil, and higher on the purplish soil of shaqimiao parent material generally, but low productivity on the acid, strong alkaline or strong calcium purplish soil.更多还原