Wen Yue-rong, Dang Ting-hui, Tang Jun, Li Jun-chao
Ying Yong Sheng Tai Xue Bao. 2016 Jan;27(1):83-90.
The content and storage of soil organic carbon (SOC) were compared in six wood restoration modes and adjacent abandoned land on opencast coal mine dump, and the mechanisms behind the differences and their influencing factors were analyzed. Results showed that the contents of SOC in six wood lands were significantly higher (23.8%-53.2%) than that of abandoned land (1.92 g · kg⁻¹) at 0-10 cm soil depth, the index were significantly higher (5.8%-70.4%) at 10-20 cm soil depth than the abandoned land (1.39 g · kg⁻¹), and then the difference of the contents of SOC in the deep soil (20-100 cm) were not significant. The contents of SOC decreased with increase of soil depth, but the decreasing magnitude of the topsoil (0-20 cm) was higher than that of the deep soil (20-100 cm). Compared with the deep soil, the topsoil significant higer storage of SOC in different woods, the SOC storage decreased with the soil depth. Along the 0-100 cm soil layer, the storage of SOC in six wood lands higher (18.1%-42.4%) than that of the abandoned land (17.52 t · hm⁻²). The SOC storage of Amorpha fruticosa land (24.95 t · hm⁻²) was obviously higher than that in the other wood lands. The SOC storage in the shrub lands was 12.4% higher than that of the arbor woods. There were significantly positive correlations among forest litter, fine root biomass, soil water content and SOC on the dump. Consequently, different plantation restorations significantly improved the SOC level on the dump in 0-100 cm soil, especially the topsoil. But there was still a big gap about SOC level between the wood restoration lands and the original landform. To improve the SOC on opencast coal mine dump, A. fruticosa could be selected as the main wood vegetation.
对比了露天煤矿排土场上六种林木恢复模式及其相邻弃荒地土壤有机碳（SOC）的含量与储量，并分析了差异背后的机制及其影响因素。结果表明，在0-10cm土层深度，六种林地的SOC含量（1.92g·kg⁻¹）显著高于弃荒地（23.8%-53.2%），在10-20cm土层深度，该指标显著高于弃荒地（1.39g·kg⁻¹）（5.8%-70.4%），而深层土壤（20-100cm）中SOC含量差异不显著。SOC含量随土层深度增加而降低，但表土层（0-20cm）的降低幅度高于深层土壤（20-100cm）。与深层土壤相比，不同林地表土层SOC储量显著更高，SOC储量随土层深度降低。沿0-100cm土层，六种林地的SOC储量高于弃荒地（17.52t·hm⁻²）（18.1%-42.4%）。紫穗槐林地的SOC储量（24.95t·hm⁻²）明显高于其他林地。灌木林地的SOC储量比乔木林地高12.4%。排土场上森林凋落物、细根生物量、土壤含水量与SOC之间存在显著正相关。因此，不同的人工林恢复显著提高了排土场0-100cm土层，尤其是表土层的SOC水平。但林木恢复地与原始地貌的SOC水平仍存在较大差距。为提高露天煤矿排土场的SOC，可选择紫穗槐作为主要木本植被。
