Defining nutritional constraints on carbon cycling in boreal forests - towards a less 'phytocentric' perspective
Defining nutritional constraints on carbon cycling in boreal forests - towards a less 'phytocentric' perspective
复制标题
DOI：
10.1023/a:1019650226585
复制
发表时间：
2002-05-01
期刊：
影响因子：
4.9
通讯作者：
Finlay, RD
中科院分区：
文献类型：
--
作者：
Lindahl, BO;Taylor, AFS;Finlay, RD
对可能的全球气候变化的兴趣日益增加，这突出表明需要更好地了解生态系统各组成部分之间的碳分配如何受到养分供应限制的影响。微生物在所有生态系统中的碳和养分循环中发挥着根本性作用，但真菌的作用在北方森林生态系统中尤为关键。传统的养分循环模型基于农业系统中开发的方法和概念，其中微生物主要被认为是为植物提供无机养分的养分处理器。真菌的丝状本质，它们在不同基质之间转运碳和营养物质的能力以及外生菌根真菌利用有机营养物质的能力都在很大程度上被忽视了。在这篇文章中，提出了一个新的模式，强调分解生物和植物之间的有机养分的竞争，与植物依赖于其相关的菌根真菌的养分收购。分解者和菌根真菌之间的养分转移的拮抗作用被认为是养分循环的重要途径。由于分解真菌的营养保守特性，无机营养被认为对植物营养的重要性较低。新的养分循环模式对北方森林碳平衡的影响进行了讨论。
Growing interest in possible global climate change has underlined the need for better information concerning the way in which carbon partitioning between ecosystem components is influenced by constraints on nutrient availability. Micro-organisms play a fundamental role in the cycling of carbon and nutrients in all ecosystems but the role of fungi in particular is pivotal in boreal forest ecosystems. Traditional models of nutrient cycling are based on methods and concepts developed in agricultural systems where microorganisms are considered primarily as nutrient processors providing plants with inorganic nutrients. The filamentous nature of fungi, their ability to translocate carbon and nutrients between different substrates and the capacity of ectomycorrhizal fungi to utilise organic nutrients have all been largely ignored. In this article, a new model is suggested which emphasises competition for organic nutrients between decomposer organisms and plants, with the plants depending on their associated mycorrhizal fungi for nutrient acquisition. Antagonistic interactions involving nutrient transfer between decomposer and mycorrhizal fungi are proposed as important pathways in nutrient cycling. Due to the nutrient conservative features of decomposer fungi, inorganic nutrients are considered less important for plant nutrition. The implications of the new nutrient cycling model on the carbon balance of boreal forests are discussed.