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Tree restoration and ecosystem carbon storage in an acid and metal impacted landscape: Chronosequence and resampling approaches
Forest Ecology and Management ( IF 3.7 ) Pub Date : 2020-05-01 , DOI: 10.1016/j.foreco.2020.118012
Michael D. Preston , Martin E. Brummell , Emily Smenderovac , Brittany Rantala-Sykes , Robyn H.M. Rumney , Geoff Sherman , Nathan Basiliko , Peter Beckett , Marc Hebert

Abstract Tree restoration on degraded land has been identified as an effective and affordable capture carbon strategy but it is unclear if carbon sequestration rates are comparable to rates on non-industrially impacted silvicultural forests. To this end, we resampled a jack pine (Pinus banksiana) and red pine (P. resinosa) chronosequence 16 years after the initial measurement to quantify carbon pools following ca. 40 years of regreening on an acid and metal impacted landscape. Measured carbon pools were then compared to those reported in an unpublished study to determine how carbon sequestration rates have changed over time and if repeated sampling at the stand level validates temporal trends estimated by the chronosequence. Total ecosystem carbon (TEC) within the stands ranged from 55 to 136 Mg ha−1 with a regional mean of 90.2 ± 9.6 Mg ha−1. On average, tree and soil organic pools (SOC) were the two largest carbon pools, representing 47% and 42% of TEC, respectively. Compared with unplanted sites, tree restoration resulted in a significant increase in the mean TEC among all sites of 54.4 ± 10.2 Mg ha−1 with a corresponding sequestration rate of 1.7 ± 0.3 Mg ha−1 yr−1. The chronosequence approach was only able to consistently detect a change in the tree carbon pool. In contrast, repeated sampling at the stand level identified changes in carbon sequestration rates within SOC, LFH and shrub carbon pools and showed that the chronosequence tree carbon sequestration rate was underestimated by a factor of 2.3. Chronosequence studies assume study sites have similar landscape history and environmental conditions, which may not be reasonable in highly degraded landscapes where past events (e.g., pollution, erosion, restoration) influence multiple landscape characteristics (e.g., local hydrology and topography). We conclude that tree restoration on impacted landscapes can sequester carbon at a rate comparable to silvicultural plantations in a similar climatic region and that reforestation of industrially damaged landscapes could be part of an effective carbon capture strategy.

中文翻译:

受酸和金属影响的景观中的树木恢复和生态系统碳储存:时间序列和重采样方法

摘要 退化土地上的树木恢复已被确定为一种有效且负担得起的碳捕获策略,但尚不清楚碳固存率是否与未受工业影响的造林森林的比率相当。为此,我们在初始测量后 16 年对针叶松 (Pinus banksiana) 和红松 (P.resinosa) 的时间序列重新采样,以量化大约 10 年之后的碳库。在受酸和金属影响的景观上重新绿化 40 年。然后将测量的碳库与一项未发表的研究中报告的碳库进行比较,以确定碳固存率如何随时间变化,以及在林分级别的重复采样是否验证了时间序列估计的时间趋势。林分内的生态系统总碳 (TEC) 范围为 55 至 136 Mg ha-1,区域平均值为 90.2 ± 9.6 Mg ha-1。平均而言,树木和土壤有机库 (SOC) 是两个最大的碳库,分别占 TEC 的 47% 和 42%。与未种植的地点相比,树木恢复导致所有地点的平均 TEC 显着增加 54.4 ± 10.2 Mg ha-1,相应的封存率为 1.7 ± 0.3 Mg ha-1 yr-1。时间顺序方法只能始终如一地检测到树木碳库的变化。相比之下,林分级别的重复采样确定了 SOC、LFH 和灌木碳库内碳固存率的变化,并表明时序树的碳固存率被低估了 2.3 倍。时间序列研究假设研究地点具有相似的景观历史和环境条件,这在过去事件(例如 、污染、侵蚀、恢复)影响多种景观特征(例如,当地水文和地形)。我们得出的结论是,受影响景观上的树木恢复可以以与类似气候区域中的造林人工林相当的速度固碳,并且重新造林受工业破坏的景观可能是有效的碳捕获策略的一部分。
更新日期:2020-05-01
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