基于DAYCENT模型的甘南高寒草甸土壤有机碳含量动态模拟及影响因素的灰色关联度分析  

Simulation of soil organic carbon content dynamics in Gannan alpine meadow based on DAYCENT model and gray correlation analysis of influencing factors

作　　者：田景 张美玲 王晨 张锐祺 李钊 TIAN Jing;ZHANG Meiling;WANG Chen;ZHANG Ruiqi;LI Zhao(Center for Quantitative Biology,College of Science,Gansu Agricultural University,Lanzhou 730070)

机构地区：[1]甘肃农业大学理学院,数量生物学研究中心,兰州730070

出　　处：《环境科学学报》2024年第6期384-394,共11页Acta Scientiae Circumstantiae

基　　金：国家自然科学基金(No.32260353);甘肃省重点研发计划(No.21YF5WA096);科技部高端外国专家引进计划(No.G2022042009L)。

摘　　要：全球土壤有机碳中的10%~30%是草地土壤有机碳,其在调节生态系统平衡方面发挥着重要的作用.本研究以甘南州高寒草甸为研究对象,通过野外实测数据和文献中的参数范围对DAYCENT模型进行参数校准,使其适用于甘南州高寒草甸土壤有机碳含量的模拟.利用灰色关联度量化海拔、气温和降水与土壤有机碳含量之间的关系.结果表明:1993—2023年土壤总有机碳含量呈下降趋势,与缓性、惰性土壤有机碳含量的变化一致.土壤总有机碳含量在土壤有机碳库中变化幅度是最大的,减少了0.1 g·kg^(-1).活性土壤有机碳含量由于占比较少,其变化幅度最小,减少了0.05 g·kg^(-1).空间上表现为由西南向东北逐渐减少,且有机碳的含量随着土层的增加而减少.土壤有机碳含量的变化与海拔和降水量的变动具有一致性,而与温度呈反向一致性.灰色关联度分析结果表明,降水对土壤有机碳含量的影响最大.Grassland soil organic carbon accounts for 10%to 30%of the global soil organic carbon,which plays an important role in regulating ecosystem balance.This study focuses on alpine meadows in Gannan.The parameters of the DAYCENT model are calibrated by using field data and parameter in literature to make it suitable for the simulation of soil organic carbon content of the research area.The relationship between elevation,temperature and precipitation and soil organic carbon content is analized by grey correlation degree.The results show that the soil total organic carbon content shows a decreasing trend from 1993 to 2023,which is consistent with the change of slow and passive soil organic carbon content.The total soil organic carbon content has the largest variation in the soil organic carbon pool,which decreases by 0.1 g·kg^(-1).Due to the small proportion,the organic carbon content of active soil has the smallest change,which decreases by 0.05 g·kg^(-1).The spatial distribution shows that it gradually decreases from southwest to northeast,and the content of organic carbon decreasea with the increase of soil layer.The variation of soil organic carbon content is consistent with the variation of elevation and precipitation,but reverse consistent with temperature.Grey correlation analysis shows that precipitation had the greatest effect on soil organic carbon content.

关 键 词：DAYCENT模型 土壤有机碳含量 高寒草甸 灰色关联度分析 甘南 

分 类 号：S812.2[农业科学—草业科学]