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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.
Masson pine forests with similar recovery conditions and different restoration periods were chosen as the targets. The eroded bare soil and the secondary forest were used as a control. The spatial-temporal substitution method was used to study the effects of non-protective organic carbon Carbon and particulate organic carbon), their distribution ratio and their transformation to protective organic carbon were studied.The results showed that soil organic carbon content and its reserves increased significantly with the restoration period during the period of vegetation restoration (0 ~ 30 years). Vegetation restoration 7 to 11 years, soil non-protective organic carbon content increased significantly, the distribution ratio also increased significantly, and restored to 27 years and 30 years after the distribution ratio remained at a relatively stable level, indicating that the initial process of vegetation restoration to non- Organic carbon accumulated in the form of protective organic carbon, while soil organic carbon was relatively stable after long-term restoration. The conversion rate constant (k) of non-protective organic carbon to protective organic carbon at 0 ~ 10 cm and 10 ~ Respectively, showed extremely significant correlations and significant correlations, indicating that the transformation of non-protective organic carbon to protective organic carbon gradually progressed during the process of vegetation restoration.