株行距配置和无性系对杨树人工林碳储量的影响  

Effects of planting spacing configurations and clones on carbon storage in poplar plantations

作　　者：刘钰[1] 张艳华[1] 方升佐[1,2] LIU Yu;ZHANG Yanhua;FANG Shengzuo(College of Forestry and Grassland,Nanjing Forestry University,Nanjing,Jiangsu 210037,China;Co-innovation Center for the Sustainable Forestry in Southern China,Nanjing Forestry University,Nanjing,Jiangsu 210037,China)

机构地区：[1]南京林业大学林草学院,江苏南京210037 [2]南京林业大学南方现代林业协同创新中心,江苏南京210037

出　　处：《森林与环境学报》2024年第3期242-249,共8页Journal of Forest and Environment

基　　金：江苏省碳达峰碳中和科技创新专项“江苏省杨树人工林碳动态及减排增汇关键技术”(BK20220017)。

摘　　要：为探究不同株行距配置和无性系对杨树人工林碳储量的影响,采用林木生物量直接收获法对13年生南林-895杨(NL-895)4种株行距配置(6 m×6 m、4.5 m×8.0 m、5 m×5 m、3 m×8 m)、南林-95杨(NL-95)和南林-797杨(NL-797)6 m×6 m株行距配置林分的碳储量进行了研究。结果表明:不同林分单株生物量存在显著差异(P<0.05),以6 m×6 m株行距配置模式的NL-895单株生物量最高(400.96 kg·株^(-1));4种株行距配置的NL-895林分的生物量不存在显著差异,但在6 m×6 m株行距配置林分中,NL-895和NL-95的生物量显著高于NL-797(P<0.05)。杨树人工林各器官的碳含量(质量分数)在39.79%~47.76%之间,表现为树干>树枝>根系>树叶;不同株行距配置林分的林木碳储量变异趋势与林分生物量相似,6 m×6 m株行距配置NL-895林分的林木碳储量最高,3 m×8 m株行距配置的NL-895林分的林木碳储量最低。不同无性系和株行距配置对杨树人工林土壤(0~100 cm)碳储量有一定影响但不显著,其碳储量约占杨树人工林碳储量的71.7%。同一无性系不同株行距配置林分的总碳储量存在显著差异(P<0.05),而同一株行距配置不同无性系林分总碳储量无显著差异。总体来看,6 m×6 m株行距配置的NL-895林分总碳储量最大(192.46 t·hm^(-2)),分别是4.5 m×8.0 m、5 m×5 m、3 m×8 m株行距配置林分的1.17、1.31、1.38倍。综上所述,在江苏省类似的立地条件下,建议选择NL-895、株行距6 m×6 m的均匀配置作为碳汇林营造的经营模式。To understand the effects of clones and planting spacing on carbon storage in poplar plantations,the impacts of four planting spacings(6 m×6 m,4.5 m×8.0 m,5 m×5 m,and 3 m×8 m)for NL-895 and 6 m×6 m spacing for two clones(NL-95,and NL-797)on carbon storage in the plantations were investigated using the direct harvesting of forest biomass method.A significant difference in single tree biomass was evident among the investigated plantations(P<0.05).The highest biomass(400.96 kg·tree^(-1))occurred in the 6 m×6 m stand of NL-895.No significant variation was observed in biomass production per area among the four planting spacings for NL-895.The stand biomass production was significantly greater in clones NL-895 and NL-95 than in NL-797 at a planting spacing of 6 m×6 m(P<0.05).The carbon content in the poplar components ranged from 39.79%to 47.76%in the order stem>branch>root>leaf.The variation tendency of poplar carbon storage was similar to the biomass production of the plantations.The highest and lowest tree carbon storage was observed in the NL-895 plantation with a planting spacing of 6 m×6 m and 3 m×8 m,respectively.Soil carbon storage in the top 1 m accounted for approximately 71.7%of the total carbon storage.However,no obvious variation in soil carbon storage was detected among plantations.The total carbon storage among the plantations differed significantly with the four planting spacings in NL-895(P<0.05).By contrast,no significant difference was observed among the plantations with the three poplar clones at 6 m×6 m spacing.Overall,the highest carbon storage of 192.46 t·hm^(-2)was obtained in the 6 m×6 m plantation of NL-895;this level was 1.17-,1.31-,and 1.38-times the levels in the plantations with 4.5 m×8.0 m,5 m×5 m,and 3 m×8 m spacings,respectively.The collective findings indicate that using the clone NL-895 as the planting material and establishing a plantation with an even planting spacing of 6 m×6 m are optimal management patterns for carbon sequestration forests at similar sites in Jia

关 键 词：杨树 株行距 无性系 生物量 碳含量 土壤碳 碳储量 

分 类 号：S718[农业科学—林学] S757