杉桤混交效果及机理分析

Research on Effects and Mechanism of Mixed Forest with Cunninghamia lanceoiata(Lamb.) Hook. and Alnus cremastogyne Burk

摘要:

对20 a生杉木、桤木混交林丰产效果和机理进行研究,结果表明:混交林内桤木自然保存率低于杉木;杉木单株材积、单位面积材积分别大于桤木4.44%和28.1%.混交林下生物量是纯林的2.41倍,且植被种类、覆盖率及高度都显著大于纯林.混交林提高了土壤的透水和透气性能,土壤中有机质含量和主要营养元素含量均有所提高.杉木、桤木光饱和点、光补偿点有明显的差异,两树种混交对利用自然阳光有相互补充的作用.

Abstract:

The study is carried out on high-yield effects and mechanism of the 20-year-old Cunninghamia lanceoiata(Lamb.) Hook.and Alnus cremastogyne Burk mixed forests.The result shows that survival percentages of Aluns cremastogyne Burk is lower than Cunninghamia lanceoiata(Lamb.) Hook.in the mixed forests;the volume of individual plant and the volume of unit area of Cunninghamia lanceoiata(Lamb.) Hook.are separately more 4.44% and 28.1% than that of Aluns cremastogyne Burk.Biomass distribution which is below the mi...