红壤侵蚀地马尾松人工林恢复过程中土壤非保护性有机碳的变化  

Dynamics of unprotected soil organic carbon with the restoration process of Pinus massoniana plantation in red soil erosion area

作　　者：吕茂奎[1,2] 谢锦升[1,2] 周艳翔[1,2] 曾宏达[1,2] 江军[1,2] 陈细香[1,2] 胥超[1,2] 陈坦[1,2] 付林池 

机构地区：[1]湿润亚热带山地生态国家重点实验室培育基地,福州350007 [2]福建师范大学地理科学学院,福州350007

出　　处：《应用生态学报》2014年第1期37-44,共8页Chinese Journal of Applied Ecology

基　　金："十二五"国家基础研究发展计划项目(2012CB722203);高等学校博士学科点科研基金专项(20113503130001);福建省自然科学基金项目(2010J01138)资助

摘　　要：选择红壤侵蚀区本底条件相似而恢复年限不同的马尾松林为对象，以侵蚀裸地和次生林为对照，结合时空代换法对侵蚀地植被恢复过程中表层土壤非保护性有机碳（轻组有机碳和颗粒有机碳）含量、分配比例及其向保护性有机碳转化过程进行研究．结果表明：在植被恢复过程中（0～30年）土壤有机碳含量及其储量随恢复年限极显著增加．植被恢复7～11年，土壤非保护性有机碳含量显著增加，其分配比例也明显升高，而恢复至27年和30年后分配比例保持在较稳定水平，说明植被恢复初始过程主要以非保护性有机碳的形式积累，而长期恢复后土壤有机碳呈相对稳定状态；0～10cm和10～20cm土壤非保护性有机碳向保护性有机碳的转化速率常数（k）与恢复年限分别呈极显著相关和显著相关，说明植被恢复过程中土壤非保护性有机碳逐渐向保护性有机碳转化．By the method of spatiotemporal substitution and taking the bare land and secondary for- est 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 protec- ted 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 sig- nificantly （P〈0.05） after 7-11 years＇ restoration but stabilized after 27 and 30 years of restora- tion. 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 res- toration. Positive correlations were found between restoration years and the rate constant for C trans- ferring 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.

关 键 词：退化红壤 轻组有机碳 颗粒有机碳 植被恢复过程 碳转化速率常数 马尾松林 

分 类 号：S791.248[农业科学—林木遗传育种]