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于上、中、下坡开展西南桦(Betula alnoides)幼林施肥试验,通过常规生长调查探明德宏州山地西南桦幼林的施肥效果及其坡位效应。结果显示:坡位、施肥以及两者的交互作用对西南桦胸径、树高和冠幅生长均影响极显著(P<0.01)。随着施肥量的增加,西南桦胸径、树高和冠幅生长量显著增大(P<0.05)。各处理的施肥效果因坡位而异;T1处理(对照)的西南桦胸径和树高生长量受坡位的影响不显著(P≥0.05),而T3处理的胸径和树高生长量随坡位下降显著增大;所有处理的冠幅生长量在中坡和下坡之间差异不显著,两者显著高于上坡。研究结果可为滇西山地西南桦幼林经营管理提供科学依据。
Fertilization experiment of young Betula alnoides was carried out on the upper, middle and downhill slopes. The fertilization effect and the slope position effect of Betula alnoides young plantations in the mountainous area of Dehong were determined by routine growth survey. The results showed that the effects of slope position, fertilization and their interaction on DBH, tree height and crown width were significant (P <0.01). With the increase of fertilizer application, the growth of DBH, tree height and crown width of Betula alnoides increased significantly (P <0.05). The results showed that the DBH and height growth of Betula alnoides were not significantly affected by the slope position (P> 0.05), while the DBH and tree height growth of T3 treatment varied with slope The decrease of crown growth was not significant between the mid-slope and the down-slope, and both of them were significantly higher than the uphill slope. The results provide a scientific basis for the management of Betula platyphylla young forests in western Yunnan.