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
刘钰 1张艳华 1方升佐2
作者信息
- 1. 南京林业大学林草学院,江苏 南京 210037
- 2. 南京林业大学林草学院,江苏 南京 210037;南京林业大学南方现代林业协同创新中心,江苏 南京 210037
- 折叠
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 6m×6m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6m×6m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,6m×6m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、3m×8m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6m×6m的均匀配置作为碳汇林营造的经营模式.
Abstract
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 Jiangsu Province.
关键词
杨树/株行距/无性系/生物量/碳含量/土壤碳/碳储量Key words
poplar/spacing/clone/biomass/carbon content/soil carbon/carbon storage引用本文复制引用
基金项目
江苏省碳达峰碳中和科技创新专项(BK20220017)
出版年
2024
国家科技期刊平台
NSTL
万方数据