采用空间代替时间的方法，研究了茂兰喀斯特森林自然恢复过程中土壤有机碳库特征，结果表明：土壤容重(0~10 cm土层0.94~1.15 g cm-3，>30 cm土层0.98~1.19 g cm-3)、石砾含量(0~10 cm土层19.93~26.61 %，>30 cm土层20.36~32.11 % )随恢复进展而减少，随土层加深而增加；土壤容积(0~10 cm土层20.13~22.02 m3，>30 cm土层4.16~6.87 m3)、有机碳含量(0~10 cm土层21.14~52.67 g kg-1，>30 cm土层11.15~25.93 g kg-1)、有机碳密度[(0~10 cm土层1.91~4.03 kg m-2，>30 cm土层0.39~1.96 kg m-2 )、有机碳储量(900m2样地0~10 cm土层0.538~0. 883 t，>30 cm土层0.039~0.137 t)、易氧化碳含量(0~10 cm土层5.28~33.25 g kg-1，>30 cm土层5.98~14.13 g kg-1 )均随恢复进展而增加，随土层加深而减少；随恢复进展0~20 cm土层有机碳稳定性增强、活性降低，>20 cm土层则相反；随土层加深有机碳稳定性增强、活性降低；土壤有机碳随恢复进展总体上具碳汇效应，且早期其量少质低、表聚性强、碳汇效应不显著、固碳潜力大，后期则相反。加强保护喀斯特森林，使其自然恢复，有利于土壤质量的提高和有机碳的累积。
To study evolution of the characteristics of the soil organic carbon pool in the Karst region of Maolan with the process of natural restoration of karst forest vegetation, the concept of space as a substitute for time was adopted. Results show that soil bulk density (0.94~1.15 g cm-3 in 0~10 cm soil layer and 0.98~1.19 g cm-3 in >30 cm soil layer) and rock fragment content (19.93~26.61% in 0~10 cm soil layer and 20.36~32.11% in >30 cm soil layer) increased with soil depth and decreased along with the process of the restoration; soil volume (20.13~22.02 m3 in 0~10 cm soil layer and 4.16~6.87 m3 in >30 cm soil layer), soil organic carbon content (21.14~52.67 g kg-1 in 0~10 cm soil layer and 11.15~25.93 g kg-1 in >30 cm soil layer), soil organic carbon density (1.91~4.03 kg m-2 in 0~10 cm soil layer and 0.39~1.96 kg m-2 in >30 cm soil layer), soil organic carbon storage (0.538~0. 883 t in 0~10 cm soil layer and 0.039~0.137 t in >30 cm soil layer in a sample lot 900 m2 in area) and readily oxidizable carbon (5.28~33.25 g kg-1 in 0~10 cm soil layer and 5.98~14.13 g kg-1 in >30 cm soil layer) increased with the process of the restoration and decreased with soil depth; soil organic carbon became more stable and less active with the process of the natural restoration in the 0~20 cm soil layer, but went reversely in the >20 cm soil layer and it increased in stability and decreased in activity with soil depth. The variation of soil organic carbon with the process of the natural restoration generally demonstrates that soil plays a role as a sink of atmospheric carbon dioxide. At the early restoration stages, soil organic carbon in the soil was low in quantity, poor in quality, and high in surface accumulation tendency, showing that the sink effect of the soil was not significant and that the soil was high in carbon sequestration potential, however, at the late stages, all went reversely. It is, therefore, essential to take strong measures to preserve karst forests and let them restore naturally, which helps improve soil quality and accumulate organic carbon.
黄宗胜,符裕红,喻理飞.喀斯特森林植被自然恢复过程中土壤有机碳库特征演化[J].土壤学报,2013,50(2):306-314. DOI:10.11766/trxb201204040106 Huang Zongsheng, Fu Yuhong, Yu Lifei. Characteristic evolution of soil organic carbon pool with the process of natural restoration of Karst forest vegetation[J]. Acta Pedologica Sinica,2013,50(2):306-314.复制