Planting trees is one of the most effective activities in recovering soil organic carbon (SOC) stocks of degraded areas, but we still lack information on how different tree species can influence soil respiration, one of the main sources of carbon dioxide (CO₂) to the atmosphere. This study aimed to explore the influence of different tree species on the autotrophic and heterotrophic components of the total soil respiration in a bauxite mining area under reclamation. We analyzed the soil CO₂ efflux under five treatments: (i) monoculture of clonal Eucalyptus; (ii) monoculture of Anadenanthera peregrina (L.); (iii) a mixed plantation of 16 native tree species; (iv) a mined area without vegetation cover as a control site; and (v) a natural forest cover as a reference site. This design allowed exploring the soil CO₂ dynamics in a gradient of recovery, from a degraded area to natural vegetation. Additionally, we measured soil temperature, moisture, and soil attributes. Soil CO₂ efflux increased with increasing tree species cover in the rainy months. There was no significant change in CO₂ efflux among the tree species. However, heterotrophic soil respiration contributed to 64% of total soil CO₂ efflux and was associated with litter decomposition. Among the abiotic variables, increases in soil moisture had the most influence on CO₂ efflux. Therefore, these results help to understand the factors that underpin the loss of SOC and show that afforestation with different tree species can recovery the soil biological activity by improving litter deposition and is a promising way to restore soil quality in degraded areas.

中文翻译：

---

不同树种对复垦矿区自养和异养土壤呼吸的影响

植树是恢复退化地区土壤有机碳 (SOC) 储量的最有效活动之一，但我们仍然缺乏关于不同树种如何影响土壤呼吸的信息，土壤呼吸是二氧化碳 (CO ₂ )的主要来源之一。气氛。本研究旨在探讨不同树种对开垦铝土矿区总土壤呼吸的自养和异养成分的影响。我们分析了五种处理下的土壤 CO ₂流出：(i) 无性系桉树的单一栽培；(ii) Anadenanthera peregrina 的单一栽培(L.); (iii) 16 种本地树种的混合种植园；(iv) 没有植被覆盖的雷区作为控制点；(v) 作为参考地点的天然森林覆盖。这种设计允许在从退化区域到自然植被的恢复梯度中探索土壤 CO ₂动态。此外，我们测量了土壤温度、湿度和土壤属性。在雨季，土壤CO ₂流出量随着树种覆盖度的增加而增加。树种间CO ₂流出量无显着变化。然而，异养土壤呼吸贡献了总土壤 CO ₂流出的64%，并与凋落物分解有关。在非生物变量中，土壤水分的增加对二氧化碳的影响最大₂流出。因此，这些结果有助于了解导致 SOC 损失的因素，并表明不同树种的造林可以通过改善凋落物沉积来恢复土壤生物活性，是恢复退化地区土壤质量的有希望的方法。