油松林土壤有机碳储量变化及其影响因素  

Changes of soil organic carbon storage in Pinus tabulaeformis forest and its influencing factors

作　　者：王越 栾亚宁[1] 王丹 戴伟[1] WANG Yue;LUAN Yaning;WANG Dan;DAI Wei(College of Forestry,Beijing Forestry University,Beijing 100083,China;Songshan National Nature Reserve Administration,Beijing 102115,China)

机构地区：[1]北京林业大学林学院,北京100083 [2]北京松山国家级自然保护区管理处,北京102115

出　　处：《浙江农林大学学报》2021年第5期1023-1032,共10页Journal of Zhejiang A&F University

基　　金：国家林业和草原局业务委托项目(2019ZXFWLXY003)。

摘　　要：【目的】通过探究油松林Pinus tabulaeformis土壤有机碳质量分数和储量的垂直变化和时间变化特征,为油松林土壤碳储量预测和碳汇管理提供理论依据。【方法】基于1980−2017年文献数据,综合运用单因素方差分析、多重比较、相关性分析和通径分析等方法,探讨棕壤和褐土2种土壤类型下油松林土壤有机碳质量分数及储量变化特征,并结合不同时期中国森林经营措施和油松生长特征分析其驱动因素。【结果】油松林土壤有机碳质量分数和储量变化随土层深度增加而显著降低(P<0.05),0~20 cm土层是碳库的主要贡献层,占0~60 cm土层土壤有机碳储量的45%~50%;近40 a间土壤有机碳质量分数和储量呈先减少后增加的时间变化特征,其中,2000−2009年为最低点,而后出现较大幅度增加,在2017年达到储量最高点,为247.02 Tg。【结论】土壤容重、土壤全氮和林分郁闭度是油松林土壤有机碳质量分数(储量)变化的主要因素,不同时期森林经营和保护措施对三者的深刻影响是油松林土壤有机碳质量分数和储量呈现明显时间变化的重要原因。[Objective]The objective is to explore the vertical and temporal variation characteristics of soil organic carbon(SOC)content and storage in Pinus tabulaeformis forest,so as to provide a theoretical basis for soil carbon storage prediction and carbon sink management in P.tabulaeformis forest.[Method]Based on the literature data from 1980 to 2017,the characteristics of spatial and temporal variation for SOC content and storage in P.tabulaeformis forest under brown soil and cinnamon soil types were discussed using the methods of one-way ANOVA,multiple comparison,correlation analysis and path analysis,and the driving factors were analyzed combined with China’s forest management measures and growth characteristics of P.tabulaeformis in different periods.[Result]The change of SOC content and storage in P.tabulaeformis forest decreased significantly with the increase of soil depth(P<0.05),and 0−20 cm soil layer was the main contribution layer of carbon pool,accounting for 45%−50%of SOC storage in 0−60 cm soil layer.In the past 40 years,the content and storage of SOC showed the temporal variation characteristics of first decreasing and then increasing,among which 2000−2009 was the lowest,and then increased significantly,reaching the highest storage point of 247.02 Tg in 2017.[Conclusion]Soil bulk density,soil total nitrogen and stand canopy density are the main factors affecting the change of SOC content,and the profound effects of forest management and protection measures on the three factors are the important reasons for the significant temporal changes of SOC content and storage in P.tabulaeformis forest.

关 键 词：油松林 土壤有机碳储量 影响因素 通径分析 

分 类 号：S714.5[农业科学—林学]