新西兰已知年龄的12种土著森林和灌木林物种的特定物种基本树干木材密度

IF 1.5 4区 农林科学 Q2 FORESTRY
M. Marden, S. Lambie, L. Burrows
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引用次数: 0

摘要

背景:新西兰本土树木和灌木物种的树木碳估计主要基于新西兰各地数量有限的树木(通常年龄不详)和数量有限的地点的平均基本树干木材密度。然而,树干木材密度值直接反映在新西兰的国际和国家温室气体核算中。我们用12种本土森林和灌木林物种的新的年龄特异性值来扩充现有已发表的基本树干密度数据,包括在北纬35°至46°之间的21个广泛分布的地点中很少获得的6岁以下树木的值,并探索通常用于估计碳储量的关系。方法:采用水置换、烘干和称重的方法,测定478个全茎木盘的体积。回归分析用于确定基本树干木材密度与树高、根颈直径(RCD)和乳高直径(DBH)之间的可能关系。非平衡方差分析用于确定5年年龄组(即0–5岁、6–10岁等)基本树干木材密度的种间差异(P<0.05)。由于只有在一些研究地点才确定了杨梅科的特定分类群,我们将每个研究地点的数据结合起来,并使用了Kunzea spp。我们将我们的年龄和物种特异性结果与现有公布的数据进行比较,其中年龄是特定的,而非年龄特异性值。结果:Kunzea spp.和Leptispermum scoparium基本树干密度与树高、RCD和DBH呈正相关。没有建立任何关系的梅,Coprosma grandiflora,Weinmania racemosa?6岁,或对于小于6岁的罗汉松、澳大利亚玛瑙、葡萄和亚历山大松。小于6岁的铜针布和铁针布仅与DBH呈显著正相关,而涤纶针布则呈负相关。无论年龄如何,硬木物种L.scoparium和Kunzea spp.之间的基本树干木材密度没有差异。但明显大于(P=0.001)其余的,主要是同等年龄的软木物种。对于Kunzea spp.、L.scopearium、Coprosma grandiflora、Weinmania racemosa和Melicytus ramiflorus?6岁时,没有证据表明基本树干木材密度随树龄增加,其值在已发表和未发表的数据范围内。对于位于北纬35°至46°之间的Kunzea spp.自然恢复林分,基本树干木材密度值往往随着海拔降低和温度升高而增加。结论:Kunzea spp.的基本木材密度值随着海拔的降低和温度的升高而增加,这表明在有当地数据的地方,使用这些数据将提高当地和全国生物量估计的准确性。此外,完善现有混合软木物种群落、再生灌木林和本土物种新种植的生物量估计,将需要额外的基本树干密度值,以从树干体积扩展到总林分生物量。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Species-specific basic stem-wood densities for twelve indigenous forest and shrubland species of known age, New Zealand
Background: Tree carbon estimates for New Zealand indigenous tree and shrub species are largely based on mean basic stem-wood densities derived from a limited number of trees, often of unspecified age and from a limited number of sites throughout New Zealand. Yet stem-wood density values feed directly into New Zealand’s international and national greenhouse gas accounting. We augment existing published basic stem-wood density data with new age-specific values for 12 indigenous forest and shrubland species, including rarely obtained values for trees <6-years old, across 21 widely-distributed sites between latitudes 35° and 46° S, and explore relationships commonly used to estimate carbon stocks. Methods: The volume of 478 whole stem-wood discs collected at breast height (BH) was determined by water displacement, oven dried, and weighed. Regression analyses were used to determine possible relationships between basic stem-wood density, and tree height, root collar diameter (RCD), and diameter at breast height (DBH). Unbalanced ANOVA was used to determine inter-species differences in basic stem-wood density in 5-yearly age groups (i.e. 0–5 years, 6–10 years etc.) (P<0.05). As specific taxa of Kunzea ericoides (Myrtaceae) has only been identified at some study sites we combine the data from each site, and use the term Kunzea spp. We compare our age- and species-specific results with existing published data where age is specified versus non-age-specific values. Results: Kunzea spp. and Leptospermum scoparium exhibited positive correlations between basic stem-wood density and tree height, RCD, and DBH. No relationships were established for Melicytus ramiflorus, Coprosma grandiflora, Weinmannia racemosa ?6-years old, or for Podocarpus totara, Agathis australis, Vitex lucens, and Alectryon excelsus <6-years old. Dacrydium cupressinum and Prumnopitys ferruginea <6-years old exhibited a significant positive relationship with DBH only, while for Dacrycarpus dacrydioides, each correlation was negative. Irrespective of age, basic stem-wood density is not different between the hardwood species L. scoparium and Kunzea spp. but is significantly greater (P=0.001) than that of the remaining, and predominantly softwood species of equivalent age. For Kunzea spp., L. scoparium, Coprosma grandiflora, Weinmannia racemosa, and Melicytus ramiflorus ?6-years old there was no evidence that basic stem-wood density increased with tree age, and values were within the range of published and unpublished data. For naturally reverting stands of Kunzea spp. located between latitudes 35° to 46° S, basic stem-wood density values tended to increase with decreased elevation and increased temperature. Conclusions: Increasing basic wood density values in Kunzea spp. with decreased elevation and increased temperature suggest that where local data are available its use would improve the accuracy of biomass estimates both locally and nationally. Furthermore, refining biomass estimates for existing communities of mixed softwood species, stands of regenerating shrubland, and new plantings of indigenous species will require additional basic stem-wood density values for scaling from stem wood volume to total stand biomass.
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来源期刊
CiteScore
2.20
自引率
13.30%
发文量
20
审稿时长
39 weeks
期刊介绍: The New Zealand Journal of Forestry Science is an international journal covering the breadth of forestry science. Planted forests are a particular focus but manuscripts on a wide range of forestry topics will also be considered. The journal''s scope covers forestry species, which are those capable of reaching at least five metres in height at maturity in the place they are located, but not grown or managed primarily for fruit or nut production.
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