Effects of environmental factors on soil organic carbon under natural or managed vegetation restoration
Effects of environmental factors on soil organic carbon under natural or managed vegetation restoration
复制标题
自然或管理植被恢复环境因素对土壤有机碳的影响
DOI：
10.1002/ldr.2876
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发表时间：
2018-03-01
影响因子：
4.7
通讯作者：
Su, Yi-Rong
中科院分区：
文献类型：
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作者：
Hu, Pei-Lei;Liu, Shu-Juan;Su, Yi-Rong
为了扩大对恢复生态系统中土壤有机碳（SOC）积累的科学理解，我们使用了来自岩石集水区的246个土壤样品（10.24 km2），并测定了不同植被恢复类型下环境因子的影响（管理的，包括饲料草地和种植园林，或自然的，包括草地、灌木林和次生林）对土壤有机碳含量（SOCC）和土壤有机碳密度（SOCD）的影响。自然植被的SOCC和SOCD显著高于管理植被和耕作地，但管理植被和耕作地的SOCC和SOCD无显著差异。岩石露头率、土壤容重、海拔、土壤深度、坡度、pH等环境因子对土壤有机碳的影响显著，自然植被恢复中土壤有机碳和土壤有机碳密度的变化由环境因子解释的比例高于人工植被恢复，且这一比例沿着演替梯度增加。然而，驱动SOCC和SOCD变化的环境因素因植被类型而异。土壤容重对土壤有机碳变化的影响最大，但牧草地除外，土壤有机碳的变化主要受土壤容重的影响。除耕地和牧草地的SOCD变化主要受海拔高度的驱动外，其他植被类型的SOCD变化主要受ROR的驱动。这一结果表明，自然植被恢复比管理植被恢复更有利于固碳，从而缓解全球气候变化。因此，未来的研究应考虑这些不同的环境驱动因素在不同的植被恢复类型的SOC建模和指导恢复管理。
To expand the scientific understanding of soil organic carbon (SOC) accumulation in restored ecosystems, we used 246 soil samples from a rocky catchment (10.24 km2) in an ecologically fragile karst area of southwest China and measured the effects of environmental factors under different vegetation restoration types (managed, including forage grassland and plantation forest, or natural, including grassland, shrubland, and secondary forest) on soil organic carbon content (SOCC) and soil organic carbon density (SOCD). Significantly higher SOCC and SOCD were found in natural vegetation than in managed vegetation and tillage land but no differences in SOCC or SOCD were detected between managed vegetation and tillage land. The environmental factors include rock outcrop ratio (ROR), bulk density, altitude, soil depth, slope gradient, and pH, all showing significant effect on SOC. The proportion of variations in SOCC and SOCD explained by environmental factors was higher in natural vegetation restoration than in managed vegetation restoration, and this proportion increased along the successional gradient. However, the environmental factors driving variations in SOCC and SOCD differed according to vegetation type. Soil bulk density had the strongest effect on SOCC variation in all vegetation types, except for forage grassland, in which the variation was instead controlled by ROR. The variation of SOCD was mainly driven by ROR in most vegetation types, except for tillage land and forage grassland, in which the driving factor was altitude. This results indicated that natural vegetation restoration is more beneficial to SOC sequestration than managed vegetation restoration and thus for mitigating global climate change. Accordingly, future studies should take these different environmental drivers under different vegetation restoration types into consideration when modeling SOC and guiding restoration management.