| 不同林龄鹅掌楸人工林土壤团聚体及其有机碳状况 |
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| 引用本文： | 冯文瀚,李金彪,周聪,蒋翔鹤,陈金林.不同林龄鹅掌楸人工林土壤团聚体及其有机碳状况[J].中南林业科技大学学报,2021(2). |
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| 作者姓名： | 冯文瀚 李金彪 周聪 蒋翔鹤 陈金林 |
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| 作者单位： | 南京林业大学现代林业协同创新中心 |
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| 基金项目： | 科技部基础性工作专项(2014FY120700);江苏高校优势学科建设工程资助项目(PAPD)。 |
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| 摘 要： | 【目的】研究鹅掌楸人工林土壤团聚体及其有机碳状况,为合理经营鹅掌楸人工林、促进林业可持续发展提供依据。【方法】以不同林龄鹅掌楸人工林(幼龄林、中龄林、成熟林)土壤为研究对象,通过野外调查和室内分析,测定各粒级土壤团聚体及其有机碳含量,分析土壤团聚体稳定性主要指标即平均重量直径(MWD)、几何平均直径(GMD),阐明土壤团聚体有机碳及其贡献率状况。【结果】不同林龄鹅掌楸人工林的土壤团聚体组成各不相同,但均以大团聚体(> 0.25 mm)为主,含量为54.98%~84.90%,且成熟林的大团聚体含量较幼龄林、中龄林分别显著提高了17.84%、25.52%;土壤团聚体稳定性指标:平均重量直径(MWD)和几何平均直径(GMD)均以成熟林的最大、幼龄林其次、中龄林最小,并且土壤团聚体稳定性指标存在明显垂直分布特征,随土层加深呈下降趋势;土壤团聚体有机碳含量及有机碳贡献率都以大团聚体中为最高;随着林龄增加,成熟林土壤团聚体有机碳含量显著高于幼龄林、中龄林,且于各林龄内,各粒级团聚体有机碳含量随土层加深呈下降趋势;土壤大团聚体有机碳贡献率随鹅掌楸林龄增加显著增大,并于成熟林土层达到80%;土壤团聚体与土壤团聚体有机碳含量相互联系,相辅相成。【结论】随鹅掌楸人工林的林龄增加,土壤大团聚体组成、团聚体稳定性、团聚体有机碳含量及土壤大团聚体有机碳贡献率总体呈增加趋势。
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| 关 键 词： | 鹅掌楸人工林 土壤团聚体 团聚体有机碳:有机碳贡献率 |
Soil aggregates and organic carbon status of Liriodendron chinense plantation at different ages |
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| FENG Wenhan,LI Jinbiao,ZHOU Cong,JIANG Xianghe,CHEN Jinlin.Soil aggregates and organic carbon status of Liriodendron chinense plantation at different ages[J].Journal of Central South Forestry University,2021(2). |
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| Authors: | FENG Wenhan LI Jinbiao ZHOU Cong JIANG Xianghe CHEN Jinlin |
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| Institution: | (Co-Innovation Center for Sustainable Forestry in Southern China,Nanjing Forestry University,Nanjing 210037,Jiangsu,China) |
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| Abstract: | 【Objective】To study the soil aggregates and organic carbon status of Liriodendron chinese Hemsl plantation,it can provide basis for rational management of Liriodendron plantation and sustainable development of forestry.【Method】The soil of Liriodendron chinense plantation(young forest,middle forest and mature forest)of different forest ages was taken as the research object.Through field investigation and indoor analysis,the content of soil aggregates and their organic carbon were measured.The main indexes of soil aggregate stability,namely the average weight diameter(MWD)and the geometric average diameter(GMD),were analyzed,and the organic carbon and its contribution rate of soil aggregates were clarified Condition.【Result】The composition of soil aggregates in different forest ages of Liriodendron chinense plantation was different,but they were mainly large aggregates(>0.25 mm),the content was 54.98%-84.90%,and the content of large aggregates in mature forest was significantly increased by 17.84%and 25.52%compared with that in young forest and middle-aged forest,respectively;the stability indexes of soil aggregates:the average weight diameter(MWD)and geometric average diameter(GMD)were all mature with the increase of forest age,the organic carbon content of soil aggregates in mature forest is significantly higher than that in young forest and middle forest,and the stability index of soil aggregates has obvious vertical distribution characteristics,showing a downward trend with the deepening of soil layer;the organic carbon content and contribution rate of soil aggregates are the highest in large aggregates;with the increase of forest age,the organic carbon content of soil aggregates in mature forest is significantly higher than that in young forest and middle forest,and at each forest age In addition,the organic carbon content of each particle aggregate decreased with the deepening of soil layer;the contribution rate of soil large aggregate organic carbon increased significantly with the increasing of Liriodendron tulip forest age,and reached 80%in the mature forest soil layer;the organic carbon content of soil aggregate and soil aggregate was interrelated and complementary.【Conclusion】With the increasing age of Liriodendron tulip plantation,the composition,stability,content and contribution rate of soil macroaggregate organic carbon increased. |
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| Keywords: | Liriodendron chinense soil aggregate aggregate organic carbon contribution rate of organic carbon |
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