标题：Investigating the influence of two different flow routing algorithms on soil-water-vegetation interactions using the dynamic ecosystem model LPJ-GUESS作者：Tang, Jing; Miller, Paul A.; Crill, Patrick M.; Olin, Stefan; Pilesjo,Petter

来源出版物：ECOHYDROLOGY 卷：8 期：4 页：570-583 DOI：10.1002/eco.1526 出版年：JUN 2015

摘要：This paper compares two flow routing algorithms' influences on ecohydrological estimations in a northern peatland catchment, within the framework of an arctic-enabled version of the dynamic ecosystem model LPJ-GUESS. Accurate hydrological estimations are needed to fully capture vegetationdynamics and carbon fluxes in the subarctic peatland enviroment. A previously proposed distributed hydrological method based on the single flow (SF) algorithm extracted topographic indices has shown to improve runoff estimations in LPJ-GUESS. This paper investigates model performance differences caused by two flow routing algorithms, and importantly both permafrost processes and peatland hydrology are included in the model. The newly developed triangular form-based multiple flow (TFM) is selected due to its improved consideration of flow continuity and more realistic flow estimation over flat surfaces. A variety of measured data is included to assess both hydrological and ecological accuracy, and the results demonstrate that thechoice of flow algorithm does matter for mesoscale ecohydrology applications. The allowance of flow convergence and consideration of flow partition differences from different terrain forms in the TFM algorithm yield better correspondence with the observed hydrological processes and also carbon fluxes. By directing flow to only one downslope cell together with its poorer depiction of flow over flat areas, the SF algorithm can result in too high runoff estimations for low-flat regions and overestimate carbon uptake and release in the peatland. The results of this study also highlight the need for care when selecting flow routing algorithms for biogeochemical estimations, especially within hydrologically and climatically sensitive environments.

入藏号：WOS:000356628900004

文献类型：Article

语种：English

作者关键词：flow routing, dynamic ecosystem model, LPJ-GUESS, peatland, carbon fluxes, single flow, multiple flow

扩展关键词：DIGITAL ELEVATION MODELS; CARBON BALANCE; SUBSURFACE STORMFLOW; DIRECTION ALGORITHMS; DRAINAGE NETWORKS; NORTHERN SWEDEN; CLIMATE; RUNOFF; AREAS; TREE

通讯作者地址：Tang, Jing; Wuhan Univ, Dept Resource & Environm Sci, Wuhan 430072, Peoples R China

电子邮件地址：lu.gistangjing@gmail.com

地址：

[Tang, Jing]Wuhan Univ, Dept Resource & Environm Sci, Wuhan 430072, Peoples R China.

[Tang, Jing; Miller, Paul A.; Olin, Stefan; Pilesjo, Petter] Lund Univ, Dept Phys Geog & Ecosyst Sci, SE-22362 Lund, Sweden.

[Crill, Patrick M.] Stockholm Univ, Dept Geol Sci, S-10691 Stockholm, Sweden.

研究方向：Environmental Sciences & Ecology; Water Resources

ISSN：1936-0584

eISSN: 1936-0592