Effect of charcoal production and woodland type on soil organic carbon and total nitrogen in drylands of southern Mozambique
Effect of charcoal production and woodland type on soil organic carbon and total nitrogen in drylands of southern Mozambique
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DOI：
10.1016/j.foreco.2019.117692
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发表时间：
2020-02
影响因子：
3.7
通讯作者：
S. Lisboa;E. Woollen;I. Grundy;C. Ryan;H. Smith;H. Smith;P. Zorrilla-Miras;Sophia Baumert;N. Ribeiro;F. Vollmer;M. Holland;A. Sitoe
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文献类型：
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作者：
S. Lisboa;E. Woollen;I. Grundy;C. Ryan;H. Smith;H. Smith;P. Zorrilla-Miras;Sophia Baumert;N. Ribeiro;F. Vollmer;M. Holland;A. Sitoe
非洲林地生态系统是土壤有机碳(SOC)和总氮(TN)的重要储存库。然而，这些生态系统功能对社会生态因素特别敏感，其影响仍未得到充分研究。在这里，我们研究了SOC、TN和其他土壤特性在不同林地类型之间的差异，以及木炭生产(研究区域林地干扰的主要来源)如何改变南部非洲干燥林地的这些因素，重点关注代表莫桑比克南部主要类型的三种林地生态系统：安德罗斯塔奇森林、谷仓林地和莫帕内林地。根据不同植被类型0-5 cm和0-30 cm深度以及距离和靠近活性碳生产地的土壤调查数据，我们估计马巴拉内区这些林地在0-30 cm处平均储存19×10(±SE)mg ha−1的有机碳和2.2×10±20.9 mg/ha−1的TN，显著低于该地区其他林地的报告值。我们的分析表明，不同林地类型土壤中有机碳和全氮的储存量没有差异，与非炭化土壤相比，炭窑土壤的有机碳(30.00±91.8万mg/ha−1)和全氮(4.5m g/ha−1)的含量是非炭化土壤的两倍。这项研究加深了我们对木炭生产对南部非洲干燥林地土壤SOC和TN的影响的理解，并展示了木炭生产的一些局部影响。鉴于该地区生态系统服务方案正在出现基于碳的支付，我们讨论了我们的研究结果的影响。
African woodland ecosystems function as important reservoirs for soil organic carbon (SOC) and total nitrogen (TN). However, these ecosystem functions are particularly sensitive to social-ecological factors, the impacts of which remain understudied. Here, we examine how SOC and TN and other soil properties vary across woodland types and how charcoal production, the main source of woodland disturbance in the study area, changes these factors in dry woodlands of southern Africa, focusing on three woodland ecosystems that represent the main types in southern Mozambique: Androstachys forest, Combretum woodland and Mopane woodlands. Drawing on data from soil surveys at 0–5 cm and 0–30 cm depth in different vegetation types as well as both distant from and proximate to sites of active charcoal production, we estimate that these woodlands in Mabalane District store on average 19 ± 10 (±SE) Mg ha−1of SOC, and 2.2 ± 0.9 Mg ha−1of TN at 0–30 cm, significantly lower than values reported for other woodlands in the region such as Miombo. Our analysis shows that the woodland types do not differ in terms of the amount of SOC and TN stored in soil, and that soil in the charcoal kilns had twice the amount of SOC (30.0 ± 1.8 Mg ha−1) and TN (4.5 ± 0.5 Mg ha−1) compared with non-charcoal soils. This study adds to our understanding of the impact of charcoal production on soil SOC and TN in dry woodlands of southern Africa, and demonstrates some localised impacts of charcoal production. We discuss the implications of our findings in the light of emerging carbon-based payments for ecosystem services programmes in the region.