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为了研究水氮耦合效应对三倍体毛白杨林木生长状况的影响和机理,筛选有利于毛白杨生长的最佳水氮组合,于2008年在河北省邢台市威县采用不同水氮组合的随机区组设计对BT17三倍体毛白杨的生长状况进行连续二年研究。结果表明:不同生长时期,BT17三倍体毛白杨胸径和树高生长量快慢为:7月>6月>5月>8月>9月;方差分析结果表明,不同水氮处理间毛白杨生长指标差异显著,其中当土壤含水量为田间持水量的75%、施氮肥量(纯氮量)为240 g株-1时,胸径和树高的增长量最大,分别达到2.83±0.14 cm、3.40±0.31 cm。根据不同的施肥小区计算毛白杨林木的材积生长量,肥料和灌溉费用,计算出不同处理的经济效益,处理W3N3的经济效益最大,超过对照处理W1N0的两倍,每公顷纯利润高出两万多元。研究为毛白杨合理施肥和速生丰产林培育提供科学依据。
In order to study the effect and mechanism of water and nitrogen coupling on the growth of triploid Populus Tomentosa wood and to select the best combination of water and nitrogen to promote the growth of Populus tomentosa, we selected a random area with different water and nitrogen combinations in Wei County, Xingtai City, Hebei Province in 2008 Set design BT17 triploid Populus growth for two consecutive years. The results showed that the growth rate of DB17 and height of DB17 triploid poplar in different growth stages was: July> June> May> August> September. The variance analysis showed that the growth index of Populus tomentosa The results showed that when the soil water content was 75% of the field capacity and the nitrogen application rate (pure nitrogen content) was 240 g plant -1, the increment of DBH and tree height reached the maximum, reaching 2.83 ± 0.14 cm and 3.40 ± 0.31 cm. According to different fertilization plots, the volume growth, fertilizer and irrigation costs of Populus tomentosa were calculated, and the economic benefits of different treatments were calculated. The economic benefits of processing W3N3 was the highest, more than twice that of W1N0. The net profit per hectare was over 20,000 Multiple. The research provided the scientific basis for the rational fertilization of Populus tomentosa and the cultivation of fast-growing and high-yielding forests.