A general biogeochemical model describing the responses of the C and N cycles in terrestrial ecosystems to changes in CO(2), climate, and N deposition.
A general biogeochemical model describing the responses of the C and N cycles in terrestrial ecosystems to changes in CO(2), climate, and N deposition.
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DOI：
10.1093/treephys/9.1-2.101
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发表时间：
1991-07
期刊：
影响因子：
4
通讯作者：
E. Rastetter;M. G. Ryan;G. Shaver;J. Melillo;K. Nadelhoffer;J. Hobbie;J. Aber
中科院分区：
文献类型：
--
作者：
E. Rastetter;M. G. Ryan;G. Shaver;J. Melillo;K. Nadelhoffer;J. Hobbie;J. Aber
建立了一个陆地生态系统碳氮循环模拟模型。该模型的基本原理是：陆地生态系统对CO（2）、气候和氮沉降变化的响应将包括酶反应、组织化学计量的变化、植物组织间生物量分配的变化、土壤有机质周转率和氮矿化率的改变，以及最终植被和土壤之间C和N的再分配。该模型是一个高度聚集的、基于过程的生态地球化学模型，旨在研究C和N在叶、细根、茎和土壤中的通量和分配的变化，以响应大气CO（2）浓度、温度、土壤水分、辐照度和无机氮输入的变化。我们使用该模型来探讨如何在CO（2）浓度，温度和N输入的变化影响两个生态系统中的碳储存：北极苔原和温带阔叶林。两个生态系统的定性反应相似。数量上的差异是由于植被和土壤之间的C和N的初始分布，在两个生态系统中的木本组织的数量，以及它们的相对程度的N限制。最后，我们对该模型的优点和缺点进行了批判性分析，并讨论了未来可能的发展方向。
A model that simulates carbon (C) and nitrogen (N) cycles in terrestrial ecosystems is developed. The model is based on the principle that the responses of terrestrial ecosystems to changes in CO(2), climate, and N deposition will encompass enzymatic responses, shifts in tissue stoichiometry, changes in biomass allocation among plant tissues, altered rates of soil organic matter turnover and N mineralization, and ultimately a redistribution of C and N between vegetation and soils. The model is a highly aggregated, process-based, biogeochemical model designed to examine changes in the fluxes and allocation of C and N among foliage, fine roots, stems, and soils in response to changes in atmospheric CO(2) concentration, temperature, soil water, irradiance, and inorganic nitrogen inputs. We use the model to explore how changes in CO(2) concentration, temperature, and N inputs affect carbon storage in two ecosystems: arctic tundra and temperate hardwood forest. The qualitative responses of the two ecosystems were similar. Quantitative differences are attributed to the initial distribution of C and N between vegetation and soils, to the amounts of woody tissue in the two ecosystems, and to their relative degree of N limitation. We conclude with a critical analysis of the model's strengths and weaknesses, and discuss possible future directions.