不同造林年限马尾松林碳密度结构特征及其影响因素  

Characteristics and influencing factors of carbon density structure in Pinus massoniana forests with different afforestation years

作　　者：王冰怡 张勇 吴翠蓉 王增 傅伟军[1] WANG Bingyi;ZHANG Yong;WU Cuirong;WANG Zeng;FU Weijun(College of Environment and Resources,Zhejiang A&F University,Hangzhou 311300,China;Zhejiang Public Welfare Forest and State Forest Farm Management Station,Hangzhou 310020,Zhejiang,China;Zhejiang Academy of Forestry,Hangzhou 310023,Zhejiang,China)

机构地区：[1]浙江农林大学环境与资源学院,浙江杭州311300 [2]浙江省公益林和国有林场管理总站,浙江杭州310020 [3]浙江省林业科学研究院,浙江杭州310023

出　　处：《浙江农林大学学报》2025年第2期291-301,共11页Journal of Zhejiang A&F University

基　　金：浙江省自然科学基金资助项目(LY20C160004);浙江农林大学省部共建亚热带森林培育国家重点实验室开放基金(SKLSS-KF2022-07)。

摘　　要：【目的】解译典型亚热带马尾松Pinus massoniana人工林生长过程中碳的积累特征,探明马尾松林的固碳机制和固碳潜力。【方法】在浙江淳安县千岛湖镇姥山林场内,选取坡度、海拔基本一致的4个不同造林年限(分别为8、12、22、38 a)的马尾松人工林样地,采用多元统计方法结合冗余分析、结构方程模型,揭示不同造林年限的马尾松林碳密度特征以及影响马尾松林碳密度的主要因素。【结果】马尾松林总生物量在38 a(成熟林)时达到最大值,显著大于中幼林的生物量(P<0.05);草本层和凋落物层生物量在造林年限为22 a时达到最大值,分别为13.74和5.24 t·hm^(-2)。不同造林年限的乔木层碳密度随造林年限增加而增加,在38 a(成熟林)时达到最大值,为176.36 t·hm^(-2)。不同造林年限马尾松林的土壤碳密度存在显著差异(P<0.05),0~10和10~30 cm土层均在38 a(成熟林)时达到最大值,分别为38.60和57.13 t·hm^(-2)。冗余分析显示:全钾和速效钾质量分数、坡向为马尾松林碳密度的主要贡献因子,分别解释了各组分碳密度的28.70%、27.00%、9.90%,对整体土壤和植被碳的固定至关重要。结构方程模型显示:容重、植被密度、全钾质量分数对马尾松林碳密度具有重要影响。【结论】马尾松林碳密度在很大程度上与造林年限有关,其中成熟阶段的马尾松林固碳能力最强。此外,环境因子和土壤养分状况对马尾松林固碳潜力的提升至关重要。[Objective]The objective of this study is to interpret the carbon accumulation characteristics during the growth process of typical Pinus massoniana forests,and investigate the mechanism and potential of carbon sequestration in P.massoniana forests.[Method]Four different afforestation years(8,12,22,38 years)of P.massoniana plantations with similar slopes and altitudes were selected in Laoshan Forest Farm,Qiandaohu Town,Chun’an County,Zhejiang Province.Multiple statistical methods combined with redundancy analysis and structural equation modeling were employed to analyze the carbon density characteristics of P.massoniana forests with different afforestation years and the main factors affecting their carbon density.[Result]The total biomass reached its maximum value at 38 years(mature forest),which was significantly higher than that of young and middle-aged forests(P<0.05).The biomass of the herb layer and litter layer reached their maximum values at 22 years of afforestation,with values of 13.74 and 5.24 t·hm^(-2),respectively.Carbon density of the tree layer increased with the increase of afforestation years,reaching a maximum value of 176.36 t·hm^(-2) at 38 years(mature forest).There were significant differences in soil carbon density among different ages of P.massoniana forests(P<0.05).The carbon density in the soil layers of 0-10 and 10-30 cm reached their maximum values at 38 years(mature forest),which were 38.60 and 57.13 t·hm^(-2),respectively.Redundancy analysis revealed that total potassium,available potassium,and slope direction were the main contributing factors to carbon density of P.massoniana forests,accounting for approximately 28.70%,27.00%,and 9.90%of the carbon density of each component,respectively,and were crucial to overall carbon sequestration of soil and vegetation.The structural equation model demonstrated that bulk density,vegetation density,and total potassium content had significant effects on carbon density in P.massoniana forests.[Conclusion]The carbon density of P.massoniana fore

关 键 词：马尾松林 碳密度 分配特征 造林年限 影响因素 

分 类 号：S718.5[农业科学—林学]