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

应用生态学报

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

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^1,2

(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)

出版日期:2014-01-18 发布日期:2014-01-18

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

LU Mao-kui^1,2, XIE Jin-sheng^1,2, ZHOU Yan-xiang^1,2, ZENG Hong-da^1,2, JIANG Jun^1,2, CHEN Xi-xiang^1,2, XU Chao^1,2, CHEN Tan^1,2, FU Lin-chi^1,2

(¹Cultivation Base of State Key Laboratory of Humid Subtropical Mountain Ecology, Fuzhou 350007, China; ^2School of Geographical Science, Fujian Normal University, Fuzhou 350007, China)

Online:2014-01-18 Published:2014-01-18

摘要/Abstract

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;0～10 cm和10～20 cm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.

Abstract: 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.

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1,2. 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[J]. 应用生态学报.

LU Mao-kui1,2, XIE Jin-sheng1,2, ZHOU Yan-xiang1,2, ZENG Hong-da1,2, JIANG Jun1,2, CHEN Xi-xiang1,2, XU Chao1,2, CHEN Tan1,2, FU Lin-chi1,2. Dynamics of unprotected soil organic carbon with the restoration process of Pinus massoniana plantation in red soil erosion area.[J]. Chinese Journal of Applied Ecology.