Stability assessment of tree ring growth of Pinus armandii Franch in response to climate change based on slope directions at the Lubanling in the Funiu Mountains,China

Global warming will affect growth strategies and how trees will adapt.To compare the response of tree radial growth to climate warming in different slope directions,samples of Pinus armandii Franch were collected and tree-ring chronologies developed on northern and western slopes from the Lubanling in the Funiu Mountains.Correlation analyses showed that two chronologies were mainly limited by temperatures in the previous June-August and the com-bination of temperatures and moisture in the current May-July.The difference of the climate response to slopes was small but not negligible.Radial growth of the LBLO1 site on the northern slope was affected by the combined maximum and minimum temperatures,while that of the LBLO2 site was affected by maximum temperatures.With regards to moisture,radial growth of the trees on the north slope was influenced by the relative humidity in the current May-July,while on the western slope,it was affected by the relative humidity in the previous June-August,the current May-July and the precipitation in the current May-July.With the change in climate,the effects of the main limiting factors on growth on different slopes were visible to a certain extent,but the differences in response of trees on different slopes gradually decreased,which might be caused by factors such as different slope directions and the change in diurnal temperature range.These results may provide information for forest protection and ecological construction in this region,and a scientific reference for future climate reconstruction.

不同种源华山松的萌芽实验和幼苗生长量对比

为对比不同种源华山松(Pinus armandi Franch.)的育苗效果,选取东川、昌宁、昆明、会泽、马关的华山松种子进行试验。试验包括萌芽试验和幼苗生长量对比实验。萌芽试验结中,与其他种源华山松相比,昆明种源华山松萌芽率(95.2%)和年终成活率(79.3%)最高,而马关种源的萌芽速度(16 d)最快。生长量对比研究发现,昆明种源华山松的生长表现均优于其他种源华山松。在90、100、110天苗龄时,昆明种源华山松的苗高和地径均显著高于其他种源。综上所述,昆明种源华山松的育苗效果最佳,可将其作为待选种源进行筛选试验。