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首页> 外文期刊>Forest Ecology and Management >Proportion of above-ground biomass in commercial logs and residues following the harvest of five commercial forest species in Australia
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Proportion of above-ground biomass in commercial logs and residues following the harvest of five commercial forest species in Australia

机译：在澳大利亚收获了五种商品林物种之后，商品原木和残留物中地上生物量的比例

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摘要

A significant factor influencing the contribution of wood products to carbon (C) storage is the proportion of above-ground tree biomass (AGB) recovered in commercial logs at harvest. This study examined the proportion of AGB in logs and residues at the harvest of radiata pine, cypress pine, blackbutt, spotted gum and messmate. Messmate and spotted gum had the highest variation in stem diameter and height. The average AGB ranged from 2000 to 3000kg for the hardwoods and 220-1000kg for the softwoods. Blackbutt had the overall lowest proportion of AGB recovered in commercial logs (45.5%) and radiata pine the highest (65%). The proportion of AGB in the bark of the hardwoods was significantly lower than in the softwoods. The proportion of the AGB in forest residues following harvest ranged from 30 to 55% depending on the species. The proportion of AGB recovered in high quality commercial logs ranged from 15% for spotted gum to 63% for radiata pine. The differences were due to the natural characteristics of the selected species and variations in regional market availability. The highest retention rates of AGB in high quality hardwood commercial logs were obtained for trees with DBH between 500 and 600mm (messmate and blackbutt) and greater than 600mm for spotted gum. The mean moisture content of the wood of the different species ranged from 35 to 50%. Messmate and radiata pine logs had the highest moisture content (48 and 50%, respectively). The C concentration of blackbutt, radiata pine and cypress pine was slightly higher than 50%. The softwoods had significantly higher C concentration than the hardwoods. The C concentration between positions (cross-section, sapwood and heartwood) also varied for the different species. The highest proportion of the above-ground C was in the debarked log for all species with the exception of blackbutt. The cellulose concentration of the wood ranged from 56 to 64% for hardwoods and 40-52% for the two softwoods. The lignin concentration of the wood ranged from 16 to 19% for the hardwoods and 25-35% for the two softwoods. The hardwood species could not be distinguished from one another based on the cellulose, hemicellulose and lignin concentration, but within the softwood species, cypress pine and radiata pine formed separate clusters.
机译：影响木材产品对碳（C）储存的贡献的重要因素是在收获时在商业原木中回收的地上树木生物量（AGB）的比例。这项研究检查了在辐射松，柏树松，黑,、斑点树胶和使者的收获时原木和残留物中AGB的比例。梅香和斑点胶的茎直径和高度变化最大。硬木平均AGB为2000到3000kg，软木平均AGB为220-1000kg。 Blackbutt在商业原木中回收的AGB总体比例最低（45.5％），而辐射松最高（65％）。硬木树皮中AGB的比例明显低于软木。采伐后，AGB在森林残留物中的比例在30％至55％之间，具体取决于物种。高质量商业原木中回收的AGB比例从点胶的15％到辐射松的63％不等。差异是由于所选物种的自然特征和区域市场可用性的差异所致。 DBH在500至600mm（同伴和黑对接）之间的树木，斑点树胶大于600mm的树木，在高质量硬木商品原木中，AGB的保留率最高。不同物种的木材的平均含水量为35％至50％。梅草和辐射松的原木水分含量最高（分别为48％和50％）。黑but，辐射松和柏树松的碳含量略高于50％。软木的碳含量明显高于硬木。不同物种的位置（横截面，边材和心材）之间的C浓度也不同。除黑but外，所有物种的地上木中地上碳的比例最高。木材的纤维素浓度对于硬木为56％至64％，对于两种软木为40-52％。木材的木质素浓度对于硬木为16％至19％，对于两种软木则为25-35％。不能根据纤维素，半纤维素和木质素的浓度来区分硬木树种，但是在软木树种中，柏树松和辐射松形成了单独的簇。

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