Litter Traits of Native and Non-Native Tropical Trees Influence Soil Carbon Dynamics in Timber Plantations in Panama
Litter Traits of Native and Non-Native Tropical Trees Influence Soil Carbon Dynamics in Timber Plantations in Panama
复制标题
DOI：
10.3390/f10030209
复制
发表时间：
2019-02
期刊：
影响因子：
2.9
通讯作者：
Deirdre Kerdraon;J. Drewer;B. Castro;A. Wallwork;Jefferson S. Hall;E. Sayer
中科院分区：
文献类型：
--
作者：
Deirdre Kerdraon;J. Drewer;B. Castro;A. Wallwork;Jefferson S. Hall;E. Sayer
热带再造林倡议被广泛认为是缓解大气中二氧化碳浓度上升的关键战略。尽管幼龄次生林和人工林树木的快速生长可以吸收大量生物量中的碳(C)，但植树造林项目的树种选择至关重要，因为物种特性和多样性会影响微生物活动和通过植物凋落物输入的土壤碳循环。凋落物的腐烂速度在很大程度上取决于其化学和物理性质，不同凋落物混合物的性状互补性可以产生非加性效应，促进或延缓凋落物的分解。此外，微生物群落可能优先分解来自本地树种的凋落物（主场优势）。因此，关于不同树种如何影响土壤碳动态的信息可以为重新造林工作提供信息，以最大限度地提高土壤碳储量。本文在中美洲巴拿马建立了一项利用中生态系统和垃圾袋对本地黄檀单作人工林进行分解的试验。和亚马逊终端。不同凋落物类型和混合凋落物对土壤碳动态的影响。我们利用凋落物交互移植实验来评估不同类型人工林的田间优势和凋落物混合对分解速率和土壤呼吸的促进或拮抗作用。虽然凋落物性质可以解释凋落物分解的部分变化，但小气候和土壤性质也起着重要作用。群落微生物生物量C和凋落物分解量均低于原生人工林。黄檀凋落物混用对土壤分解和呼吸均有非加性影响，但对土壤呼吸的影响与人工林类型有关。此外，大地木和天竺葵人工林在土壤呼吸方面存在主场劣势。我们的研究结果表明，树种多样性在热带土壤的恢复力中起着重要作用，而种植本地树种的人工林可以帮助维持土壤固碳的关键过程。
Tropical reforestation initiatives are widely recognized as a key strategy for mitigating rising atmospheric CO2 concentrations. Although rapid tree growth in young secondary forests and plantations sequesters large amounts of carbon (C) in biomass, the choice of tree species for reforestation projects is crucial, as species identity and diversity affect microbial activity and soil C cycling via plant litter inputs. The decay rate of litter is largely determined by its chemical and physical properties, and trait complementarity of diverse litter mixtures can produce non-additive effects, which facilitate or delay decomposition. Furthermore, microbial communities may preferentially decompose litter from native tree species (homefield advantage). Hence, information on how different tree species influence soil carbon dynamics could inform reforestation efforts to maximize soil C storage. We established a decomposition experiment in Panama, Central America, using mesocosms and litterbags in monoculture plantations of native species (Dalbergia retusa Hemsl. and Terminalia amazonia J.F.Gmel., Exell) or teak (Tectona grandis L.f.) to assess the influence of different litter types and litter mixtures on soil C dynamics. We used reciprocal litter transplant experiments to assess the homefield advantage and litter mixtures to determine facilitative or antagonistic effects on decomposition rates and soil respiration in all plantation types. Although litter properties explained some of the variation in decomposition, the microclimate and soil properties in the plantations also played an important role. Microbial biomass C and litter decomposition were lower in Tectona than in the native plantations. We observed non-additive effects of mixtures with Tectona and Dalbergia litter on both decomposition and soil respiration, but the effect depended on plantation type. Further, there was a homefield disadvantage for soil respiration in Tectona and Terminalia plantations. Our results suggest that tree species diversity plays an important role in the resilience of tropical soils and that plantations with native tree species could help maintain key processes involved in soil carbon sequestration.