Carbon accumulation in soil layers under degraded, intact and planted forest cover types in tropical semi-deciduous and moist evergreen forests
Carbon accumulation in soil layers under degraded, intact and planted forest cover types in tropical semi-deciduous and moist evergreen forests
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DOI：
10.1007/s11056-022-09911-3
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发表时间：
2022-04
期刊：
影响因子：
2.2
通讯作者：
Samuel Mensah Opoku;A. Burton;E. Opuni‐Frimpong
中科院分区：
文献类型：
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作者：
Samuel Mensah Opoku;A. Burton;E. Opuni‐Frimpong
热带森林土壤可以通过在其土层中固碳和储存碳，为减缓气候变化做出重大贡献。然而，在西非，关于有多少碳储存在各种森林覆盖类型的深层土壤中并受到保护而不会进一步释放到大气中的知识仍然很少。我们量化了加纳热带土壤0-20 cm和20-50 cm处的碳（C）和氮（N）含量，通过比较半落叶林区的退化森林和完整森林，以及湿润万年青林区的完整森林、退化森林和农林复合种植园。在半落叶林中，完整林土壤C含量显著高于退化林，但由于容重的补偿性差异，完整林土壤全C含量并不高于退化林。两种森林的碳含量因深度而异，退化森林和完整森林0-20 cm处的碳含量分别为48.1和38.4 Mg ha− 1，20-50 cm处的碳含量分别为20.6和26.5 Mg ha−1。在湿润万年青林中，土壤C浓度在完整林、退化林和人工林之间相似，但在不同深度之间存在差异。其中，人工林下土壤由于容重较高，C含量最高。对于N，不同覆盖类型和土壤深度之间的差异遵循与C相似的模式。我们的研究结果表明，以前干扰或退化的森林获得更多的C的潜力主要在于活的森林生物量，而不是在土壤中，特别是如果森林一直保持植被覆盖的某种类型，因为干扰。深层土壤储存碳的潜在容量很大，而且对森林干扰的敏感性较低，使它们成为需要进一步量化和保护的重要土壤碳库。
Tropical forest soils can contribute significantly to mitigating climate change by sequestering and storing carbon in their layers. However, in West Africa, knowledge of how much carbon is stored in deeper soil layers of various forest cover types and protected from further release into the atmosphere remains scanty. We quantified the carbon (C) and nitrogen (N) contents of tropical soils in Ghana at 0–20 cm and 20–50 cm, by comparing a degraded forest and an intact forest in the semi-deciduous forest zone, and intact forest, degraded forest, and agroforestry plantations in the moist evergreen forest zone. In semi-deciduous forests, C concentration was significantly higher for intact forest than degraded forest, but total C content of soils from the intact forest was not greater than the degraded forest due to compensating differences in bulk density. C content differed by depth for the two forests, with values at 0–20 cm of 48.1 vs 38.4 Mg ha−1and at 20–50 cm of 20.6 vs 26.5 Mg ha−1, for degraded and intact forests respectively. In moist evergreen forests, soil C concentrations were similar between intact forest, degraded forest and plantations, yet, differed between the depths. Among the three, soils under plantations had the highest C content due to higher bulk density. For N, differences among cover types and soil depths followed similar patterns as those for C. Our results suggest the potential for formerly disturbed or degraded forests to gain more C lies primarily in live forest biomass, not in soil, especially if forests have maintained vegetative cover of some type since disturbance. The potentially large capacity for deeper soil layers to store C, and their reduced susceptibility to forest disturbance makes them an important soil carbon pool to further quantify and preserve.