CAJ | 학술논문

实验设正常供氮(0.5 mmol/L NO3-)和高氮(10 mmol/L NO3-)处理，研究不同pH值水平下(4.5～8.0)氮素供应对玉米根系生长的影响。结果表明，氮供应与溶液pH值对玉米根系的影响不存在互作效应。高氮供应不影响地上部与根的干物质积累；pH值提高有利于促进干物质向地上部分配，向根的分配比例相对下降，根冠比下降。高氮使单株根系总长度平均下降，降幅为34.5%，主要是轴根和侧根长度下降，轴根数和侧根密度受影响较小。在两个氮水平下，总根长、轴根长、侧根长均随pH值的上升表现增加的趋势，高pH值主要增加侧根密度。研究表明，在酸性土壤上，不能通过大量施用硝态氮肥缓解氢离子对根系生长的抑制作用。
실험설정상공담(0.5 mmol/L NO3-)화고담(10 mmol/L NO3-)처리，연구불동pH치수평하(4.5～8.0)담소공응대옥미근계생장적영향。결과표명，담공응여용액pH치대옥미근계적영향불존재호작효응。고담공응불영향지상부여근적간물질적루；pH치제고유리우촉진간물질향지상부분배，향근적분배비례상대하강，근관비하강。고담사단주근계총장도평균하강，강폭위34.5%，주요시축근화측근장도하강，축근수화측근밀도수영향교소。재량개담수평하，총근장、축근장、측근장균수pH치적상승표현증가적추세，고pH치주요증가측근밀도。연구표명，재산성토양상，불능통과대량시용초태담비완해경리자대근계생장적억제작용。
The effect of high N treatments on maize root growth was investigated under varied pH(from 4.5 to 8.0) value in the culture solution supplied with either high(10 mmol/L) or normal(0.5 mmol/L) N. The results showed that there was not an interaction between the effect of N supply and solution pH value. Dry matter accumulation was not altered by high N treatment. High pH decreased dry matter allocation from shoot to root and therefore resulted in a lower root to shoot ratio. High N reduced total root length by 34.5%across different pH levels, which were mostly con-tributed by the decrease in the length of axial roots and lateral roots. Whereas the number of axial roots and lateral roots were not affected. Under both N levels, total root length, axial root length and lateral root length increased with increasing solution pH. It seems unable to alleviate the adverse effect of low pH on root growth in acidic soils by in-creasing N input.