Carbon stores and fluxes in even- and uneven-aged Norway spruce stands

IF 1.7 3区农林科学 Q2 FORESTRY Silva Fennica Pub Date : 2013-01-01 DOI:10.14214/SF.1024

P. Nilsen, L. Strand

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引用次数: 24

Abstract

This investigation compares present C stores, fluxes and historic tree C sequestration in an uneven-aged and an even-aged Norway spruce stand under similar high productive soil conditions in south-eastern Norway. A selection cutting system has been performed in the uneven-aged forest stand for 81 years and the even-aged stand was established after clear-cutting 81 years ago. Timber productivity has been measured in the uneven stand for 81 years and in the even-aged stand for 52 years. C storage was determined based on tree measurements, tree biomass functions, soil samples and C analyses from trees and soil. Litter fall was sampled during one year and CO2 efflux from the soil was measured during one growing season. The present tree C storage (including roots) was 210 Mg C ha–1 in the even-aged stand and 76 Mg C ha–1 in the uneven-aged stand, while the corresponding figures for C in the soil was 178 and 199 Mg C ha–1. The long term timber production in the uneven-aged stand was measured to be 95% of the even-aged stand and the difference in net C sequestration was 37 Mg ha–1 in an 81 year period in favour the even-aged stand. The highest present CO2 efflux from soil was measured in the even-aged stand. The total net C sequestered in trees during 81 years minus the present soil C-stock accounts to 16 Mg ha-1 in favour the even-aged system.

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年龄均匀和不均匀的挪威云杉林的碳储量和通量

本研究比较了在挪威东南部类似高产土壤条件下，一个不均匀树龄和一个均匀树龄的挪威云杉林分目前的碳储量、通量和历史上的树碳封存。在81年的不均匀林分上实行了选择性采伐制度，81年前的完全采伐建立了均匀林分。对不均匀林分和均匀林分的木材生产力进行了81年和52年的测定。碳储量是根据树木测量、树木生物量功能、土壤样品和树木和土壤的碳分析来确定的。在一年的时间里对凋落物进行采样，并在一个生长季节测量土壤的CO2外排。平均林龄和不均匀林龄分别为210 Mg C ha-1和76 Mg C ha-1，土壤碳储量分别为178 Mg C ha-1和199 Mg C ha-1。非均匀林龄林分的长期木材产量为均匀林分的95%，在81年期间，净碳固存差异为37 Mg ha-1。平均树龄林分土壤CO2排放最高。在81年期间，树木吸收的净碳总量减去目前的土壤碳储量为16 Mg ha-1，有利于平均年龄系统。

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来源期刊

Silva Fennica 农林科学-林学

CiteScore

3.50

自引率

11.10%

发文量

审稿时长

3 months

期刊介绍： Silva Fennica publishes significant new knowledge on forest sciences. The scope covers research on forestry and forest ecosystems. Silva Fennica aims to increase understanding on forest ecosystems, and sustainable use and conservation of forest resources. Use of forest resources includes all aspects of forestry containing biomass-based and non-timber products, economic and social factors etc.