天然常绿阔叶林改造为板栗林对土壤有机碳库的影响

发布时间：2018-01-07 02:16

本文关键词：天然常绿阔叶林改造为板栗林对土壤有机碳库的影响　出处：《应用生态学报》2016年07期 　论文类型：期刊论文

【摘要】：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.
[Abstract]:After the natural forest was transformed into artificial forest, the vegetation cover type and management measures changed. Therefore, the characteristics of soil organic carbon pool were significantly affected. The natural evergreen broad-leaved forest and chestnut forest were determined in Linan City, Zhejiang Province (Chestnut Forest was transformed from evergreen broad-leaved forest). Soil organic carbon storage and active organic carbon pool with different forms were observed in 10 years (0 cm) and 20 cm (20 cm) and 20 cm (20 cm) respectively. The chemical structure of soil organic carbon (SOC) was analyzed by solid-state nuclear magnetic resonance (SNMR), and the effect of natural evergreen broad-leaved forest on soil organic carbon pool was studied. The results showed that the evergreen broad-leaved forest was transformed into chestnut forest. The contents of soil surface organic carbon, water-soluble organic carbon, thermal water-soluble organic carbon, microbial biomass carbon and easily oxidized carbon decreased by 19.734. 4% and 25. 8% respectively. The contents of alkoxy and carbon in the surface layer of soil decreased by 38.4% and 22.2cm, respectively, at 30.4% and 25.20.The indexes of subsurface layer of soil decreased by 38.4and 19.80.The contents of alkoxy and carbon in the surface layer of the soil decreased respectively. Aromatic carbon content and aromaticity decreased significantly, while alkyl carbon content, carbonyl carbon content and A / O A value increased significantly. The alkoxy carbon content in the subsurface layer of the soil decreased significantly, while the alkyl carbon content and the A / O A value increased significantly, while the aromatic carbon content increased. There was no significant change in carbonyl carbon content and aromaticity. After transforming natural evergreen broadleaved forest into chestnut forest and intensive management for a long time, soil organic carbon storage and active organic carbon pool decreased significantly. The chemical structure of organic carbon changed significantly.
【作者单位】：浙江农林大学浙江省森林生态系统碳循环与固碳减排重点实验室;浙江农林大学亚热带森林培育国家重点实验室培育基地;
【基金】：国家自然科学基金项目(31170576) 浙江省自然科学基金项目(LY14C160007,LY15C160006)资助~~
【分类号】：S714.2
【正文快照】： 气候变暖是人类当前面临的最严峻的全球性生态环境问题,而CO2和CH4等温室气体浓度的上升与全球气候变暖有着密不可分的关系[1].土壤作为陆地生态系统最大的碳库,其碳库的动态变化与大气CO2浓度的动态变化有着非常紧密的联系[2-3].土地利用方式的改变,会引起植被覆盖类型和经营

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