两种培育模式下闽楠生长及生物量研究

Research on growth and biomass of Phoebe bournei under two cultivation styles

在福建宁化国有林场开展了混交(马尾松:闽楠混交比例分别为1:1和2:1)和马尾松间伐后林下套种(25%和40%间伐强度)2种培育模式下闽楠生长、材积及生物量的研究。结果表明,造林后第1年,马尾松林下套种的闽楠成活率高于马尾松+闽楠混交林;造林后1-4年,闽楠树高、胸径和材积在马尾松林下套种和马尾松+闽楠混交林中没有显著差异;造林后7-9年,马尾松+闽楠1:1混交林中闽楠胸径、树高、单株材积和单株生物量均显著高于马尾松+闽楠2:1混交林;40%间伐处理后林下套种的闽楠胸径、树高、单株材积和单株生物量大于25%间伐处理。总体上,造林7年后混交林中闽楠生长量和生物量显著高于林下套种。因此,闽楠与马尾松营造混交林比在马尾松林下套种更有利于其生长,但确定适宜的混交比例和加强后期的抚育管理(如间伐)对于闽楠人工林培育仍是十分重要的。

Growth, stem volume and dry biomass of Phoebe bournei were studied in Pinus massoniana ＋ P. bourneimixed plantation （P. massoniana ： P. bournei = 1：1 and 2：1, respectively） and thinned P. massoniana plantation （25%and 40% thinning intensity） in Ninghua National Forest Farm, Fujian Province. The results showed that the survival rateof P. bournei at the first year after planting was higher in underplanted treatment than that in mixed plantation. From the1st to the 4th year after planting, tree height, diameter at breast height （DBH） and stem volume of P. bournei were nosignificant difference in underplanted and mixed stands. 7-9 years after planting, the tree height, DBH, individual stemvolume and biomass of P. bournei were significantly higher in the mixed plantation with1：1 mixed proportion than thatin the 2：1 mixed plantation. These variables were significantly higher in the 40% thinning treatment than that in the 25%thinning treatment. Overall, the growth and biomass of P. bournei were significantly higher in the mixed plantation thanthat in the underplanted treatment after seven years. Therefore, P. bournei could grow better in the P. massoniana ＋ P.bournei mixed plantation than under the P. massoniana plantation. It is important to determine the appropriate mixedproportions and forest management （such as thinning） for P. bournei plantation.