配方施肥对印楝人工林产量和生长性状的影响

对元谋干热河谷印楝人工林经3 a施肥试验表明,配方施肥对印楝林分的生长和结实产量均产生显著影响:(1)施肥当年对林分生长未显明显肥效,施肥效应主要表现在施肥后第1年,到施肥后第2年肥效总体呈下降趋势;各生长性状对施肥配方反应的敏感性排序为:冠幅＞株高＞地径＞胸径;以株高和冠幅生长为评价依据,第14处理(300 g氨肥+300 g磷肥+200 g钾肥)为最优施肥组合方案.(2)不同施肥配方处理间以及不同年份之间,印楝的结实产量均存在显著差异;有机肥与P、K肥的组合配方对印楝结实量产生明显增益,其中第1处理(8 kg有机肥+200 g磷肥+200 g钾肥)为增加印楝结实产量的最佳施肥方案;各年份施肥处理间结实产量的排序为:施肥后第1年＞施肥后第2年＞施肥当年.此外,施肥前的林分本底值对林木生长产生极显著影响,在一定程度上干扰了施肥效应.

Effect of Formulated Fertilization on Yield and Growth Characteristics of Azadirachta indica Plantation

3 years' test in Yuanmou dry-hot valley showed formulated fertilization had significant effect on the yield and growth of Azadirachta indica plantation.The first year didn't show distinct fertilization effectiveness on increment of stand,and the 2nd year' fertilization effectiveness were the most significant,while there was a downward trend in the 3rd year.The sensibility rank order of the growth response to fertilization are as follows: crown breadth> plant height> ground diameter>DBH.According to the eval...