庐山不同森林植被下土壤活性有机碳的季节变化

Dynamic Changes of Soil Active Organic Carbon Pool under Different Forest Vegetations in Mt.Lushan

摘要: 研究庐山森林土壤有机碳库动态变化，无论对预测和维护森林生态系统长期生产力，还是为全球气候变化研究提供基础数据方面，均具有重要意义。以庐山6种森林植被下土壤为研究对象，对不同森林植被下土壤各种活性有机碳的季节变化及相互关系进行分析。结果表明：1) 常绿阔叶林下ROC、WSOC、MBC含量均为最高，但其相应组分占TOC的比重较小，说明各组分有机碳的含量与植被类型有着密切关系。2) ROC的季节变化幅度较小，WSOC、MBC的季节变化较为复杂；总体上ROC与MBC含量表现为夏季高而冬季低，WSOC则完全相反。

Abstract: Studying forest soil organic carbon dynamic changes in Mt.Lushan has a significant meaning for forecasting and maintaining long-term productivity of forest ecosystems. It also provides basic data for the global climate change. In this paper, we take six kinds of soil under different forest vegetations in Mt.Lushan as samples to study changes of active soil organic carbon under various forest vegetations in different seasons and relationships between these soil organic carbons. The results showed that: evergreen broad-leaved forest has the highest levels in ROC, WSOC, MBC, but a smaller proportion of TOC comparing to other forest vegetations, which indicates that organic carbon has a close relationship with vegetation types. ROC’s seasonal change is not very big in extent. The seasonal variation in WSOC and MBC is more complicated. In a word, the content of ROC and MBC is high in warm seasons and low in cold seasons while WSOC is exactly the opposite.