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Above- and belowground carbon stocks are decoupled in secondary tropical forests and are positively related to forest age and soil nutrients respectively

机译:次生热带森林中地上和地下的碳储量解耦,分别与森林年龄和土壤养分成正相关

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Reducing atmospheric CO2 is an international priority. One way to assist stabilising and reducing CO2 is to promote secondary tropical forest regrowth on abandoned agricultural land. However, relationships between above- and belowground carbon stocks with secondary forest age and specific soil nutrients remain unclear. Current global estimates for CO2 uptake and sequestration in secondary tropical forests focus on aboveground biomass and are parameterised using relatively coarse metrics of soil fertility. Here, we estimate total carbon stocks across a chronosequence of regenerating secondary forest stands (40-120 years old) in Panama, and assess the relationships between both above- and belowground carbon stocks with stand age and specific soil nutrients. We estimated carbon stocks in aboveground biomass, necromass, root biomass, and soil. We found that the two largest carbon pools - aboveground biomass and soil - have distinct relationships with stand age and soil fertility. Aboveground biomass contained similar to 61-97 Mg C ha(-1) (24-39% total carbon stocks) and significantly increased with stand age, but showed no relationship with soil nutrients. Soil carbon stocks contained similar to 128-206 Mg C ha(-1) (52-70% total stocks) and were unrelated to stand age, but were positively related to soil nitrogen. Root biomass carbon stocks tracked patterns exhibited by aboveground biomass. Necromass carbon stocks did not increase with stand age, but stocks were held in larger pieces of deadwood in older stands. Comparing our estimates to published data from younger and older secondary forests in the surrounding landscape, weshowthat soil carbon recovers within 40 years of forest regeneration, but aboveground biomass carbon stocks continue to increase past 100 years. Above- and belowground carbon stocks appear to be decoupled in secondary tropical forests. Paired measures of above- and belowground carbon stocks are necessary to reduce uncertainty in large-scale models of atmospheric CO2 uptake and storage by secondary forests. (C) 2019 Elsevier B.V. All rights reserved.
机译:减少大气中的二氧化碳是国际优先事项。一种有助于稳定和减少二氧化碳的方法是促进废弃农业土地上的次生热带森林再生。然而,尚不清楚地上和地下碳储量与次生森林年龄和特定土壤养分之间的关​​系。目前全球对次要热带森林中二氧化碳吸收和封存的估计主要集中于地上生物量,并使用相对粗略的土壤肥力指标进行参数化。在这里,我们估算了巴拿马再生次生林分年龄(40-120岁)按时间顺序排列的总碳储量,并评估了地上和地下碳储量与林分年龄和特定土壤养分之间的关​​系。我们估算了地上生物量,坏死生物,根生物量和土壤中的碳储量。我们发现两个最大的碳库-地上生物量和土壤-与林分年龄和土壤肥力有着明显的关系。地上生物量的含量类似于61-97 Mg C ha(-1)(占总碳储量的24-39%),并且随着林分年龄的增长而显着增加,但与土壤养分没有关系。土壤碳储量与128-206 Mg C ha(-1)相似(占总储量的52-70%),与林分年龄无关,但与土壤氮呈正相关。根生物量碳储量跟踪了地上生物量表现出的模式。死灵的碳储存量并没有随着林分龄的增加而增加,但储存在较旧林分的较大的沉木中。将我们的估计值与来自周围景观中较年轻和较老的次生森林的已发布数据进行比较,我们发现森林再生后40年内土壤碳得以恢复,但过去100年中地上生物量碳储量继续增加。次级和热带森林中地上和地下的碳储量似乎解耦。为减少次生林对大气中二氧化碳的吸收和封存的大规模模型的不确定性,必须采用成对的地上和地下碳储量测量方法。 (C)2019 Elsevier B.V.保留所有权利。

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