1年生欧美107杨地上生物量水肥耦合效应

摘要

An experiment was conducted to study the aboveground biomass of one-year-old Populus × euramericana ‘ 74/76’ under different water and fertilizer conditions by split plot design, in order to make an optimal plan of irrigation and application for high quality P. ×euramericana '74/76'. Based on the quadratic regression of aboveground biomass, a regressionbased mathematical model was set up. Result showed that an increase in irrigation amount and nitrogen application rate could promote the aboveground biomass of P. ×euramericana ‘ 74/76’. Nitrogen fertilizer exhibited the most obvious effect on aboveground biomass, followed by the combination of water and nitrogen fertilizer and irrigation amount in sequence.The optimal combination of irrigation and nitrogen fertilizer for the aboveground biomass greater than 900 g per tree was obtained as irrigation amount 35.14-41.35 kg per tree and nitrogen application rate 9.18-11.68 g per tree ( urea application rate 831.70-1058.24 kg/hm2 ).%为制定培育欧美107杨优质苗木的灌溉施肥方案,采用田问裂区试验设计,研究不同灌溉施肥下1年生欧美107杨地上生物量生长情况.通过对地上生物量结果进行二次回归拟合,建立了水肥回归数学模型.结果表明,增加灌溉量和氮肥施用量均有增产效应,水肥交互作用表现为正效应,对地上生物量影响作用由高到低依次为:氮肥施入量、水肥互作、灌溉量.欧美107杨地上生物量大于900 g/株的水肥方案为:灌溉量35.14～41.35kg/株,氮施入量9.18～11.68g/株,即施尿素831.70～1058.24 kg/hm2.