基于Biome-BGCMuSo的草地碳/水通量参数优化及其对极端气候的响应

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中图分类号：S812.6 文献标识码：A 文章编号：1007-0435（2026）04-1215-14

doi：10.11733/j.issn.1007-0435.2026.04.008

Abstract：The responses of carbon/water cycles in diferent grassland ecosystems to extreme climatic events and the underlying mechanisms varied.This study，employed the biogeochemical cycle model Biome-BGCMuSo （BGC with Multilayer Soil Module），integrated with eddy covariance data，conducted sensitivity analysis and parameter optimization to investigate variations in carbon/water fluxes across diferent grassland types and their responses to extreme climates. The results showed that carbon flux simulations were sensitive to vegetation photosynthetic physiology and carbon alocation parameters，while water flux simulations were sensitive to leaf and root parameters，with variations across grassland types. Optimizing highly sensitive parameters significantly improved carbon flux simulation accuracy，but water flux simulations stillrequire refinement.During growing season heatwaves，all three grassand types remained carbon sinks，though diurnal carbon sequestration decreased by 28.7% and 29.4% in temperate desert steppe and mountain meadows， respectively. Extreme rainfallenhanced carbon and water fluxes across all three grassands.Drought events increased carbon sequestration by 62.5% in temperate desert steppe but decreased it by 16.3% in mountain meadows. This study reveals distinct response mechanisms of carbon and water cycles in grasslands of arid-semiarid regions to extreme climatic events，providing scientific basis for predicting the evolution of grassand ecological processes under climate change.

Key words： Biome-BGCMuSo model; Grassland carbon/Water fluxes; Parameters optimization; Extreme cli mate events

草地生态系统作为陆地生态系统的重要组成部分，在全球碳循环和气候调节中扮演着关键角色，其碳储量仅次于森林，占全球陆地碳储量的40.5%[1] ，因此具备较大的碳汇潜力[2]。（剩余22676字）