间伐对马尾松人工林土壤活性有机碳的影响

发布时间：2018-07-08 08:03

本文选题：马尾松人工林 + 间伐强度　；参考：《生态学杂志》2017年03期

【摘要】：以南京市溧水区林场间伐9年后的29年生马尾松人工林为研究对象,探讨了不同间伐强度(对照:0%;弱度间伐:25%;中度间伐:45%;强度间伐:65%)对土壤3种活性有机碳含量及其在总有机碳中比例的影响。结果表明:与对照样地相比,中度间伐显著提高了土壤总有机碳含量,强度间伐显著降低了土壤总有机碳含量;土壤颗粒有机碳与易氧化有机碳含量对间伐的响应与总有机碳规律一致,土壤轻组有机碳含量在3种间伐强度下显著降低,表现为强度间伐弱度间伐中度间伐对照;土壤颗粒有机碳、轻组有机碳及易氧化有机碳在总有机碳中的比例分别为30.83%~64.59%、10.40%~26.92%、3.61%~4.62%。3种间伐强度显著降低了土壤轻组有机碳在总有机碳中的比例,对土壤易氧化有机碳在总有机碳中的比例无显著影响,中度间伐显著降低了土壤颗粒有机碳在总有机碳中的比例。中度间伐利于土壤总有机碳的积累,且土壤有机碳稳定性高。
[Abstract]:Twenty-nine years old Pinus massoniana plantation after 9 years of thinning in Lishui District of Nanjing City was used as the research object. The effects of different thinning intensities (control: 0; weak thinning: 25; moderate thinning: 45; intensity: 65%) on soil active organic carbon content and its proportion in total organic carbon were studied. The results showed that moderate thinning significantly increased soil total organic carbon content and intensity thinning significantly decreased soil total organic carbon content. The response of soil particulate organic carbon and easily oxidized organic carbon to thinning was consistent with the law of total organic carbon. The proportion of soil particulate organic carbon, light organic carbon and easily oxidized organic carbon in total organic carbon were 30.833% and 10.40% 10.40% respectively. The thinning intensity of soil particulate organic carbon, light group organic carbon and easily oxidized organic carbon in total organic carbon significantly decreased the proportion of soil light group organic carbon in total organic carbon. There was no significant effect on the proportion of soil easily oxidized organic carbon in total organic carbon, but moderate thinning significantly reduced the proportion of soil particulate organic carbon in total organic carbon. Moderate thinning is beneficial to the accumulation of total organic carbon, and the stability of soil organic carbon is high.
【作者单位】：南方现代林业协同创新中心;南京林业大学生物与环境学院;
【基金】：国家林业公益性行业科研专项项目(201104075)资助
【分类号】：S714.2

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