不同立地类型火炬树人工林生物量初步研究

Study on biomass in Rhus typhina artificial forest at different sites

测定了生长在渭北黄土高原6个立地类型上的火炬树平均各器官的含水率和生物量。结果表明,各立地类型火炬树全株平均含水率为500.1～521.7g/kg,根的平均含水率为541.4～585.5g/kg,叶的平均含水率为548.3～591.7g/kg,茎枝的平均含水率最低,为410.2～419.7g/kg;不同立地类型火炬树生物量的排序为:阳坡上部(0.4308t/hm2)>峁顶(0.3195t/hm2)>阳坡下部(0.285t/hm2)>沟底(0.1478t/hm2)>阴坡上部(0.0887t/hm2)>阴坡下部(0.0626t/hm2);茎枝是火炬树生物量的主要组成部分,占全株总生物量的41.48%～60.19%,根占24.05%～37.86%,而叶仅占到13.46%～20.74%;6个立地类型上,火炬树各器官生物量以及全株生物量均表现出显著的差异性。

We had determined water content in different organs and biomass in Rhus typhina artificial forest under six different site types in Weibei Loess Plateau.The results show that water content was almost 500.1～521.7 g/kg of all tree in Rhus typhina artificial forest under different site types,water content of roots was almost 541.4～585.5 g/kg,water content of leaf was almost 548.3～591.7 g/kg,water content of stem was the lowest,almost 410.2～419.7 g/kg;the rankings of biomass in Rhus typhina artificial forest under different site types are as following:The top of slope facing south(0.430 8 t/hm^2)>The top of loess hill(0.319 5 t/hm^2)>Underside of slope facing south(0.285 0 t/hm^2)>The bottom of chimb\{(0.147 8 (t/hm^2))\}>The top of northern slope of mountains(0.088 7 t/hm^2)>Underside of northern slope of mountains(0.062 6 t/hm^2);the stems are the primary parts in Rhus typhina,almost 41.48%～60.19% of total of biomass in all tree,roots almost (24.05%)～37.86%,leaf almost 13.46%～20.74%;the biomass of different organs and total show remarkable difference in Rhus typhina artificial forest under different site types.