| 川西亚高山天然次生林不同演替阶段土壤团聚体组成及有机碳分布特征 |
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| 引用本文： | 蔡蕾,候笔锋,冯秋红,刘前程,李旭华,潘红丽,刘兴良.川西亚高山天然次生林不同演替阶段土壤团聚体组成及有机碳分布特征[J].四川林业科技,2021(2):1-7. |
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| 作者姓名： | 蔡蕾 候笔锋 冯秋红 刘前程 李旭华 潘红丽 刘兴良 |
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| 作者单位： | 四川省林业科学研究院;四川卧龙森林生态系统国家定位观测研究站;阿坝州松潘国有林保护局;四川农业大学 |
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| 基金项目： | 国家“十三五”重点研发计划课题(2017YFC0505004,2016YFC0502104);省级基本科研项目(JB202016)。 |
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| 摘 要： | 川西亚高山天然次生林是西南亚高山林区水源涵养林的主要森林类型,在该区域森林生态系统的碳收支上有重要的作用。本文采用干筛法和重铬酸钾氧化-外加热法对不同演替阶段的次生林土壤结构及有机碳分布特征进行了研究,研究发现本区域各演替阶段次生林的土壤团聚性均比较强,大团聚体的含量为冷杉+桦木混交林最高,且大团聚体的形成与有机质含量呈负相关。有机碳的含量主要是存在于大团聚体中,以>5 mm粒径的土壤团聚体有机碳贡献率最高,表现为桦木+冷杉混交林>冷杉原始林>桦木林,且有机碳含量与土壤氮含量呈正相关。虽然冷杉原始林大团聚体含量较冷杉+桦木混交林低,但有机碳总含量最高。微团聚体含量随演替阶段的升高呈升高趋势,有机碳的含量随团聚体粒径减小而基本呈增加趋势,比较不同团聚体有机碳含量与贡献率发现,虽然<0.25 mm粒径的有机碳含量高但是贡献率低,说明微团聚体对有机碳的保护力更强,且桦木+冷杉混交林>桦木林>冷杉原始林。
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| 关 键 词： | 天然次生林 演替阶段 土壤团聚体 土壤有机碳 川西亚高山 |
Composition of Soil Aggregates and Distribution Characteristics of Organic Carbon in Different Sunccessional Stages of Subalpine NaturalSecondary Forest in Western Sichuan |
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| CAI Lei,HOU Bifeng,FENG Qiuhong,LIU Qiancheng,LI Xuhua,PAN Hongli,LIU Xingliang.Composition of Soil Aggregates and Distribution Characteristics of Organic Carbon in Different Sunccessional Stages of Subalpine NaturalSecondary Forest in Western Sichuan[J].Journal of Sichuan Forestry Science and Technology,2021(2):1-7. |
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| Authors: | CAI Lei HOU Bifeng FENG Qiuhong LIU Qiancheng LI Xuhua PAN Hongli LIU Xingliang |
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| Institution: | (Ecological Restoration and Conservation on Forest and Wetland Key Laboratory of Sichuan Province,Sichuan Academy of Forestry,Chengdu 610081,China;Sichuan Wolong Forest Ecosystem Research Station,Sichuan Academy of Forestry,Chengdu 610081,China;Aba Songpan state Foresty Protection Bureau,Aba 623300,China;Sichuan Agricultural University,Chengdu 611130,China) |
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| Abstract: | The subalpine natural secondary forest in western Sichuan is the main forest type of water conservation forest in alpine forest regions of southwestern China,which plays an important role in the carbon budget of forest ecosystems in this region.In this paper,the soil structure and organic carbon distribution characteristics of secondary forests in different successional stages were studied by dry-sieving method and potassium dichromate oxidationexternal heating method.It was found that the soil aggregates of secondary forests in each successional stage in this region was relatively strong.The content of large aggregates was the highest in Abies faxoniana and Betula spp.mixed forest,and the formation of large aggregates was negatively correlated with the content of organic matter.The content of organic carbon mainly existed in large aggregates,and the contribution rate of organic carbon in soil aggregates with particle size>5 mm was the highest,with the order of Abies faxoniana and Betula spp.mixed forest>Abies faxoniana forest>Betula spp.forest.The organic carbon content and soil nitrogen were positively correlated.Although the content of large aggregates in Abies faxoniana forest was lower than that in Abies faxoniana and Betula spp.mixed forest,the content of total organic carbon was the highest.The content of microaggregates increased with the increase of successional stage,and the content of organic carbon basically increased with the decrease of aggregate size.When comparing the organic carbon content and contribution rate of different aggregates,it was found that the organic carbon content of<0.25 mm particle size was high but the contribution rate was low,which indicated that the microaggregates had stronger protection for organic carbon and the ranking order was Abies faxoniana and Betula spp.mixed forest>Betula spp.forests>Abies faxoniana forests. |
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| Keywords: | Natural secondary forest Successional stage Soil aggregate Soil organic carbon Subalpine regions of western Sichuan |
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