Optimization of Grassland Carbon/Water Flux Parameters Based on Biome-BGCMuSo and Their Responses to Extreme Climate

doi:10.11733/j.issn.1007-0435.2026.04.008

Acta Agrestia Sinica ›› 2026, Vol. 34 ›› Issue (4): 1215-1228.DOI: 10.11733/j.issn.1007-0435.2026.04.008

Optimization of Grassland Carbon/Water Flux Parameters Based on Biome-BGCMuSo and Their Responses to Extreme Climate

WANG Xiao-yi, JING Chang-qing, WANG Gong-xin

College of Grassland Science, Xinjiang Agricultural University, Key Laboratory of Grassland Resources and Ecology, Key Laboratory of Grassland Resources and Ecology of Western Arid Region, Ministry of Education, Urumqi, Xinjiang 830052, China

Received:2025-05-26 Revised:2025-10-24 Published:2026-04-15

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

王晓毅, 井长青, 王公鑫

新疆农业大学草业学院, 新疆草地资源与生态重点实验室, 西部干旱荒漠区草地资源与生态教育部重点实验室, 新疆乌鲁木齐 830052

通讯作者: 井长青，E-mail：jingchangqing@126.com
作者简介:王晓毅（2001-），女，汉族，新疆塔城人，硕士研究生，主要从事草地生态遥感研究，E-mail：17590823770@163.com；
基金资助:
国家自然科学基金项目（42161024）；2025年中央财政林草科技推广示范项目（新[2025]TG09号）；新疆农业大学研究生科研创新项目（XJAUGRI2025001）资助

Abstract

Abstract: The responses of carbon/water cycles in different 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 different grassland types and their responses to extreme climates. The results showed that carbon flux simulations were sensitive to vegetation photosynthetic physiology and carbon allocation 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 still require refinement. During growing season heatwaves， all three grassland types remained carbon sinks， though diurnal carbon sequestration decreased by 28.7% and 29.4% in temperate desert steppe and mountain meadows， respectively. Extreme rainfall enhanced carbon and water fluxes across all three grasslands. 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 grassland ecological processes under climate change.

Key words: Biome-BGCMuSo model, Grassland carbon/Water fluxes, Parameters optimization, Extreme climate events

摘要： 不同草地生态系统碳/水循环对极端气候响应及其机制存在差异。本研究基于生物地球化学循环模型Biome-BGCMuSo（BGC with Multilayer Soil Module）结合涡度相关数据，通过敏感性分析和参数优化，探究了不同草地类型碳/水通量差异及其对极端气候的响应。结果表明，碳通量模拟对植被光合生理及碳分配参数敏感，水通量对叶片、根系参数敏感，且不同草地类型存在差异，优化高敏感参数可显著提升碳通量模拟精度，但水通量模拟仍有待进一步提高。生长季热浪期间，3种草地仍为碳汇，温性荒漠草原和山地草甸日间碳汇分别减弱28.7%和29.4%；极端降雨提升了3种草地的碳/水通量；干旱事件使温性荒漠草原碳汇增强62.5%，山地草甸碳汇减弱16.3%。本研究揭示了干旱-半干旱区草地碳/水循环对极端气候的不同响应机制，为预测气候变化下草地生态过程演变提供了科学依据。

关键词: Biome-BGCMuSo模型, 草地碳/水通量, 参数优化, 极端气候事件

CLC Number:

S812.6

WANG Xiao-yi, JING Chang-qing, WANG Gong-xin. Optimization of Grassland Carbon/Water Flux Parameters Based on Biome-BGCMuSo and Their Responses to Extreme Climate[J]. Acta Agrestia Sinica, 2026, 34(4): 1215-1228.

王晓毅, 井长青, 王公鑫. 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[J]. 草地学报, 2026, 34(4): 1215-1228.

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Optimization of Grassland Carbon/Water Flux Parameters Based on Biome-BGCMuSo and Their Responses to Extreme Climate

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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