水、氮、磷对杨树生物量的耦合效应

根据黄土高原因水肥不协调而形成大面积低效林的问题 ,以水肥耦合为中心 ,以 1龄杨树幼苗为研究对象 ,采用三因子五水平正交旋转组合回归设计方法 ,利用盆栽试验和定量分析的手段 ,研究探讨了不同水肥条件下 ,水、N、P三因子对杨树生物量的影响 ,结果表明三因素对杨树生物量存在着耦合交互效应 ,不同的水、N、P配合有不同的生物量积累 .因此 ,合理施肥、量水配肥是改善黄土高原因水肥不协调而形成大面积低效林的有效途径

Coupling effect of water,N and P to poplar biomass

According to the inconsistency of water and fertilizer on the Loess Plateau,coupling effect of water,N and P to poplar biomass was studied by centering on coupling of water and fertilizer,using regression design with three factors and five levels,and based on pot experiments and quantitative analysis.The results show that the coupling and alternating effects of three factors to poplar biomass exist and the different conditions of water,N and P produce the different biomass.Therefore,fertilizing properly is an effective method to improve the large area inferior forests caused by the inconsistency of water and fertilizer.