氮磷钾配施对杜仲中龄林生长的影响

Effects of Combined Application of Nitrogen,Phosphorus and Potassium Fertilizers on the Growth of Middle-aged Eucommia ulmoides Plantation

以杜仲中龄林为研究对象,采用“3414”完全施肥试验,分析不同水平氮磷钾肥配施对杜仲树高、胸径和冠幅生长的影响,探讨适宜杜仲中龄林的最佳肥料配比。结果表明:配施氮磷钾肥能够促进杜仲树高和胸径的生长,胸径的生长量随着施肥年限的延长显著增加,施肥2年后增加量可达未施肥条件下的1.7倍,树高的生长量在施肥第1年最高,可达未施肥条件下的1.4倍,此后随施肥年限的延长增加量趋于稳定。不同水平氮磷钾肥配施对杜仲生长的影响存在差异,中等氮磷肥配施钾肥对胸径生长的促进作用最为明显,而中等氮肥配施磷钾肥更有利于树高的增加。

Using Eucommia ulmoides as the study material,the“3414”complete fertilization experiment was carried out in the field to analyze the effects of different levels of nitrogen,phosphorus and potassium fertilizers application on the height and diameter of Eucommia ulmoides Oliv.,and to explore the best fertilization combination for the growth of Eucommia ulmoides.The results showed that the combined application of N,P and K fertilizers could promote the growth of Eucommia ulmoides height and DBH.The growth of DBH increased significantly with the extension of fertilization years,and the increase after 2 years of fertilization could reach 1.7 times of that without fertilization.The growth of tree height was the highest in the first year of fertilization,which could reach 1.4 times of that without fertilization,and then the increase tended to be stable with the extension of fertilization years.Different levels of nitrogen,phosphorus and potassium treatments had different effects on the growth of Eucommia ulmoidest.Medium nitrogen,phosphorus fertilizer combined with potassium fertilizer had the most obvious promotion effect on DBH growth,while medium nitrogen fertilizer combined with phosphorus and potassium fertilizer(N_(2)P_(1)K_(1))was more beneficial to the increase of tree height.