林地清理方式对杉木马尾松混交林幼林生产力的影响

Effects of different site preparations on productivity of young Cunninghamia lanceolata and Pinus massoniana mixed forest

通过野外调查分析了炼山和劈条带两种林地清理方式对杉木马尾松混交林生产力的影响。结果表明,劈条带处理不同坡位杉木马尾松混交林林下植被总生物量、灌木层生物量及草本层生物量均高于炼山处理;炼山处理杉木马尾松混交林同一坡位杉木和马尾松林分生长及杉木和马尾松地上部分总生物量及单株干、枝和叶等器官生物量均优于劈条带处理;同一林地清理方式不同坡位杉木马尾松混交林中杉木和马尾松生长及干、枝叶生物量均表现为:下坡>中坡>上坡。劈条带处理有利于提高杉木马尾松混交林幼龄期林分生产力,但炼山处理有利于提高杉木马尾松混交林幼龄期林木生长量。

The effects of burning-afforestation and non-burning-afforestation site preparations on productivity of young Cunninghamia lanceolata and Pinus masson/ana mixed forest were analyzed by on-the-spot-investigation. The results showed that the different slope of the total undergrowth vegetation biomass, shrub layer biomass and herb biomass treated by the non-burning-afforestation site preparation were larger than those of the forest treated by the bunting-afforestation site preparation. Under the same slope condition, the growth, aboveground part biomass, different organs biomass of stem, branch and leaf treated by burning-afforestation site preparation were larger than those treated by non-burning-afforestation site preparation. Under the same site preparation condition, the growth, different organs biomass of stem, branch and leaf exhibited the trend of lower slope 〉 middle slope 〉 upper slope. The non-burningafforestation site preparation had better effect on productivity of young C. lanceolata and P. massoniana mixed forest, but burning-afforestation site preparation had better effect on growth of young C. lanceolata and P. massoniana mixed forest.