Understanding Effects of Competition and Shade Tolerance on Carbon Allocation with a Carbon Balance Model

编号 010033903

推送时间 20220418

研究领域 森林生态 

年份 2022 

类型 期刊 

语种 英语

标题 Understanding Effects of Competition and Shade Tolerance on Carbon Allocation with a Carbon Balance Model

来源期刊 forest

期 第339期

发表时间 20220405

关键词 allometry;  black spruce;  carbon allocation;  competition;  jack pine;  ontogenetic drift;  plasticity;  thinning; 

摘要 A carbon-balance model based on mechanistic and allometric relationships (CroBas) was used to assess the effects of competition in C allocation in jack pine (Pinus banksiana Lamb.), a shade-intolerant species, and black spruce (Picea mariana (Mill.) B.S.P.), a moderately shade-tolerant species. For both species, model efficiencies ranged from 36 to 99%. The average model bias was lower than 11% and 18% for jack pine and black spruce, respectively. For both jack pine and black spruce, the total tree C increased over the years, with greater increases noted for decreasing competition. When considering a C compartment as a ratio of the total tree C, decreasing competition resulted for both species in decreasing stem C and increasing C in branches and foliage. When considering the amount of C in a given compartment, for jack pine, decreasing competition led to greater C stem, branches, foliage, and roots, whereas, for black spruce, it also increased its stem C but lately shifted at about 20 years, following thinning; thus, the changing C allocation over time results from both “passive plasticity”, reflecting environmentally induced variations in growth, and “ontogenetic plasticity”, referring to variations in the ontogenetic trajectory of a trait. Overall, the C allocation to stem and foliage relative to the total tree C generally decreased as competition decreased, supporting the optimal partitioning theory. These C-allocation patterns were related to the species’ shade tolerance and illustrated how jack pine and black spruce maximize their competitive fitness. View Full-Text

服务人员 王璐

服务院士 蒋有绪

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