【摘要】 以盆栽、田间试验和大田调查相结合的方法,研究了黄土、冲积土和盐碱土等对小麦根系生长的影响。结果表明:不同土壤内小麦根系深度变化很大。一般在0.8～2.1米之间,个别的深度达3.4米。黄土区根系最深,有夹沙层的冲积土根扎最浅。不同土壤条件下,小麦各生育时期根系增长量的差异均达到极显著水平,在壤土、黄土中,根系生长较快,根内可溶糖和全氮含量较高,而且后期糖类下降较缓慢。沙土与白腻土中根的生长一直较慢,特别是春季差距更大。盐碱土中根的生长是前期较慢,拔节以后生长加快。平原冲积土随着土层质地排列的不同,各层根含量有明显的相应变化。更多还原

【Abstract】 The growth of root system of winter wheat is significantly relatedwith the condition of the soil in which root system is distributing.In even texture loess the depth of root system distribution is gener-ally about 2 m.Minority roots may be 3.4m.The diameter of leveldistribution ranged from 1.0 to 1.2 m.In sandy soil,because thequan-tity of water and nutrients change often,root system grows slowlyand dies early in late stage.In saline-alkali soil,because of saline-al-kali damage in early stage,the root system grows slowly but it growsrapidly after shooting stage.The stratification of alluvial soil affectsdepth of root system extension.The quantity of root system is significa-ntly different in layers owing to difference of soil texture.Wheat root system in length and wight are different in periods ofgrowth.But it increaces very quickly from reawakening to booting sta-ge.The quantity of soluble sugar and nitrogen in root are significantlydifferent owing to soil types.更多还原