滴灌下欧美107杨苗高水肥耦合效应

水分和氮肥是影响欧美107杨Populus×eurame ric ana‘74/76’生长的重要因素.以1年生欧美107杨为试验材料,采用田间裂区试验设计,研究不同灌溉、氮施入量对欧美107杨苗高的影响,并建立水—苗高的水肥回归模型.结果表明:不同水肥处理下苗高之间有极显著差异(P＜0.01),各因素效应顺序为氮施入量＞水肥互作＞灌溉量.欧美107杨苗高在300～360 cm的水肥方案为灌溉量8.45～19.25 kg·株-1,施氮肥量4.57～9.12g·株-1,即施尿素413.94～826.31 kg·hm-2;苗高在360～400 cm的水肥方案为灌溉量36.02～41.87 kg·株-1,施氮肥量8.68～ 11.43 g·株-1,即施尿素786.08～1 035.05 kg·hm-2.水肥优化管理方案可为定向培育1年生欧美107杨苗木提供理论依据.

Interaction of water and fertilizer on seedling height for first-year growth Populus × euramericana ‘ 74/76＇ with drip irrigation

Water and nitrogen fertilizer are important influences on plants.To optimize irrigation and fertilizer schemes for cultivation of high quality first-year growth Populus × euramericana ＇74/76＇,a split plot design with four water treatments,three nitrogen fertilizer treatments and three replications was used with ranges of seedling height growth.Water treatments were supplied at watering to 100%,80%,60% field capacity or no watering for trees;nitrogen treatments were supplied at 0,8.00 or 15.08 g·tree-1.Based on a quadratic regression of seedling heights,a regressive math model between seedling heights（y） and irrigation water（x1）,nitrogen（x2） was established：y=297.378＋1.737x1＋5.382x2-0.008x12-0.197x22-0.015x1x2.Results showed significant differences for seedling heights（P0.01） with an influence of nitrogen water and nitrogen water.For seedling heights between 300 and 360 cm,the optimum combination was：irrigation water of between 8.45-19.25 kg·tree-1 and nitrogen of between 4.57-9.12 g·tree-1;for seedling heights between 360 and 400 cm the best combination was：irrigation of between 36.02-41.87 kg·tree-1 and nitrogen of between 8.68-11.43 g·tree-1.This research could contribute to water and fertilizer saving for cultivation of high quality Populus × euramericana ＇74/76＇.