南京林业大学学报（自然科学版）2025，Vol.49Issue(3)：25-32,8.DOI:10.12302/j.issn.1000-2006.202309037
不同林龄水杉人工林土壤颗粒有机碳和矿物结合有机碳的变化特征
The variation characteristics of particulate organic carbon and mineral-associated organic carbon during the development of Metasequoia glyptostroboides plantations
摘要
Abstract
[Objective]Plantations play significant roles in mitigating climate change.Understanding the dynamics of soil organic carbon(SOC),particularly through its key components-particulate organic carbon(POC)and mineral-associated organic carbon(MAOC)—is crucial for predicting carbon sequestration in soil.[Method]This study investigated Metasequoia glyptostroboides plantations of varying ages(7,16,21,26,31,36,42 and 46 a)located in the Dongtai Forest Farm,Jiangsu Province.For each forest age,four replicated field plots were established,and soil samples were collected from five distinct depths:[0,20),[20,40),[40,60),[60,80),and[80,100)cm.A range of soil physicochemical properties-including pH,ammonium nitrogen,nitrate nitrogen,total phosphorus,and available phosphorus-along with SOC fractions(POC and MAOC)were measured to examine the variation in POC and MAOC with the development of the plantations.[Result]POC in the[0,20)cm soil layer was the dominant contributor to the soil organic carbon pool,and its accumulation was enhanced during the plantation's development.Conversely,MAOC was the predominant fraction in the[20,40)cm soil layer,but its response to stand age and development was less pronounced.As the forest age increased,the stability of SOC in the[0,20)cm layer declined,making it more susceptible to decomposition and utilization.In contrast,SOC stability in the[20,100)cm layers remained higher,supporting longer-term organic carbon storage.Correlation analysis revealed that POC was more responsive to environmental changes driven by stand development compared to MAOC.[Conclusion]As plantations mature,soil organic carbon accumulates primarily in the surface layer[(0,20)cm]in the form of POC.The greatest accumulation occurs during the over-mature stage of the forest.Long-term plantation development significantly enhances the accumulation and retention of different fractions of surface soil organic carbon.Therefore,extending the primary cutting age of plantations would further optimize their role in mitigating global climate change.关键词
水杉人工林/颗粒有机碳/矿物结合有机碳/林分发育/深层土壤Key words
Metasequoia glyptostroboides plantations/particulate organic carbon(POC)/mineral-associated organic carbon(MAOC)/stand development/deep soil分类
林学引用本文复制引用
翟宁宁,石珂,阮宏华,倪娟平,方玉,曹国华,沈彩芹,徐亚明,霍建军..不同林龄水杉人工林土壤颗粒有机碳和矿物结合有机碳的变化特征[J].南京林业大学学报（自然科学版）,2025,49(3):25-32,8.基金项目
国家重点研发计划(2021YFD2200403) （2021YFD2200403）
国家自然科学基金项目(32071594) （32071594）
江苏省林业局揭榜挂帅项目(LYKJ[2022]01) （LYKJ[2022]01）
江苏林业局造林专项项目([2021-2022]). （[2021-2022]）
