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天然林改造为人工林后,由于植被覆盖类型和经营管理措施发生改变,从而显著影响土壤有机碳库的特征.测定浙江省临安市相邻的天然常绿阔叶林和板栗林(板栗林由常绿阔叶林改造而来,集约经营10年)表层(0~20 cm)和亚表层(20~40 cm)土壤有机碳储量和不同形态活性有机碳库,用固态核磁共振方法分析土壤有机碳的化学结构特征,研究天然常绿阔叶林改造为板栗林对土壤有机碳库的影响.结果表明:常绿阔叶林改造为板栗林后,土壤表层有机碳储量、水溶性有机碳、热水溶性有机碳、微生物生物量碳和易氧化碳含量分别下降19.7%、34.4%、25.8%、30.4%和25.2%,土壤亚表层的各指标分别下降13.5%、38.4%、19.8%、34.1%和22.2%.土壤表层烷氧碳含量、芳香碳含量以及芳香度显著降低,而烷基碳含量、羰基碳含量以及A/O-A值均显著增加;土壤亚表层烷氧碳含量显著降低,而烷基碳含量和A/O-A值显著增加,而芳香碳含量、羰基碳含量以及芳香度无显著变化.天然常绿阔叶林改造为板栗林并长期集约经营后,土壤有机碳储量和活性有机碳库均显著下降,有机碳的化学结构发生显著变化.
After the conversion of natural forest into artificial forest, the characteristics of soil organic carbon pool were significantly affected by the changes of vegetation cover types and management measures.Analysis of the natural evergreen broad-leaved forest and chestnut forest adjacent to Lin’an City in Zhejiang Province Evergreen broad-leaved forest, and intensive management for 10 years) of soil organic carbon storage and different forms of active carbon pool in the surface (0-20 cm) and subsurface (20-40 cm) soil samples were analyzed by solid state nuclear magnetic resonance Carbon chemical structure of the natural evergreen broad-leaved forest into chestnut forest soil organic carbon storage.The results showed that: After the evergreen broad-leaved forest transformed into chestnut forest, the surface soil organic carbon storage, water-soluble organic carbon, The contents of hot-water soluble organic carbon, microbial biomass carbon and readily oxidizable carbon decreased by 19.7%, 34.4%, 25.8%, 30.4% and 25.2%, respectively, and decreased by 13.5%, 38.4%, 19.8% and 34.1% % And 22.2%, respectively.The content of alkoxide, aromatic carbon and aromatic of soil surface were significantly decreased, while the contents of alkyl carbon, carbonyl carbon and A / OA were significantly increased, while the content of carbon and oxygen in soil sub-surface was significantly decreased Alkyl carbon content and A / OA Value of aromatic carbon content, carbonyl carbon content and aromaticity had no significant changes.After the conversion of natural evergreen broad-leaved forest into chestnut forest and long-term intensive management, the soil organic carbon storage and active carbon pool significantly decreased, The chemical structure of the significant changes.