大兴安岭几种主要可燃物类型地被物灰分含量比较分析

Ash Contents of Several Principal Types of Fuels in Daxing’an Mountains

应用SX2-10-13型马福炉对黑龙江省大兴安岭林区主要可燃物类型地被物灰分含量进行了测定,分析了不同可燃物类型地被物层、同一可燃物类型不同地被物层灰分含量的差异,以及产生差异的原因。同一林型不同地被物层灰分含量从总体上看,半分解层的灰分含量最高,其次是落叶层,枯枝最低。这可能与微生物的活动以及树的各部位对矿质元素的积累不同有关。不同林型同一地被物层灰分含量也不同,白桦—山杨—落叶松混交林中半分解层灰分的质量分数最高(0.31%),其次是杜鹃—越橘—落叶松林(0.27%)、山杨林(0.24%)、樟子松林(0.22%)、樟子松—落叶松林(0.16%),白桦林最低(0.13%)。混交林各地被物种类灰分含量一般较含有相同主要树种的纯林高。

An experiment was conducted to measure ash contents of the main types of fuels in Daxing＇ an Mountains in Heilongjiang Province by SX2-10-13 muffle furnace. The differences in ash contents between different types of fuels and the same type of fuel from different ground cover layers were analyzed, and the cause of the difference was discussed. Generally, the ash content of semi-decomposition layer was the highest among the ash contents of different ground covers from the same forest type, and then followed by litter layer and deadwood layer, which might be related to the microbial activity in soil and the mineral element accumulation in each part of tree. Ash contents of the same ground cover layer in different forest types were also different. The ash content of semi-decomposition layer in Populus davidiana-Betula platyphylla-Larix gemelini mixed forest was the highest （0.31 percent）, and then followed by Rhododendron simsii-Vaccinium uliginosum - L. gemelini mixed forest （ 0.27 percent）, P. davidiana forest （ 0.24 percent）, Pinus sylvestris var. mongolica-L, gemelini mixed forest （0.16 percent）, and B. platyphylla forest （0.13 percent）. Ash content of each type of fuel in mixed forest was higher than that in pure forest formed by the same dominant tree species.