Lü Mao-Kui, Xie Jin-Sheng, Zhou Yan-Xiang, Zeng Hong-Da, Jiang Jun, Chen Xi-Xiang, Xu Chao, Chen Tan, Fu Lin-Chi
Ying Yong Sheng Tai Xue Bao. 2014 Jan;25(1):37-44.
By the method of spatiotemporal substitution and taking the bare land and secondary forest as the control, we measured light fraction and particulate organic carbon in the topsoil under the Pinus massoniana woodlands of different ages with similar management histories in a red soil erosion area, to determine their dynamics and evaluate the conversion processes from unprotected to protected organic carbon. The results showed that the content and storage of soil organic carbon increased significantly along with ages in the process of vegetation restoration (P < 0.01). The unprotected soil organic carbon content and distribution proportion to the total soil organic carbon increased significantly (P < 0.05) after 7-11 years' restoration but stabilized after 27 and 30 years of restoration. It suggested that soil organic carbon mostly accumulated in the form of unprotected soil organic carbon during the initial restoration period, and reached a stable level after long-term vegetation restoration. Positive correlations were found between restoration years and the rate constant for C transferring from the unprotected to the protected soil pool (k) in 0-10 cm and 10-20 cm soil layers, which demonstrated that the unprotected soil organic carbon gradually transferred to the protected soil organic carbon in the process of vegetation restoration.
采用时空替代法，以裸地和次生林为对照，对红壤侵蚀区具有相似经营历史的不同林龄马尾松林下土壤表层的轻组有机碳和颗粒有机碳进行测定，以确定其动态变化并评估未保护有机碳向保护有机碳的转化过程。结果表明，在植被恢复过程中，土壤有机碳含量和储量随林龄显著增加（P<0.01）。恢复7 - 11年后，未保护土壤有机碳含量及其占土壤有机碳总量的比例显著增加（P<0.05），但在恢复27年和30年后趋于稳定。这表明在恢复初期，土壤有机碳主要以未保护土壤有机碳的形式积累，经过长期植被恢复后达到稳定水平。在0 - 10 cm和10 - 20 cm土层中，恢复年限与碳从未保护土壤库向保护土壤库转移的速率常数（k）呈正相关，这表明在植被恢复过程中，未保护土壤有机碳逐渐向保护土壤有机碳转化。
