摘要
为深入了解我国冬小麦生长过程对区域碳循环的影响,本研究采用气象-生态在线耦合模式(WRF-VPRM)模拟了2020年我国冬小麦生长过程中的CO_(2)通量,该模式考虑了冬小麦光合和呼吸作用以及土壤微生物呼吸作用。结果发现,模式能够合理模拟CO_(2)通量、地表CO_(2)及大气CO_(2)柱浓度的时空变化特征(一致性指数IOA达0.64~0.89)。冬小麦生长过程碳通量对大气CO_(2)的影响主要发生在春季,抽穗期光合作用最强,而成熟期呼吸作用最强,具有明显的季节特征。冬小麦生长过程显著影响了华北地区近地面的大气CO_(2)浓度,且影响程度在不同物候期表现出较大差异,其中在冬小麦抽穗期降低最为显著,达到8.33μmol·mol^(-1)。从空间上看,豫皖交界处的冬小麦对CO_(2)的吸收作用更加明显,在抽穗期能够降低CO_(2)浓度达20μmol·mol^(-1)以上。冬小麦是春季本研究区域陆地生态系统碳循环的重要参与者,占比40%,2020年整个生长季对大气CO_(2)净吸收(以C计)达422.53 g·m^(-2),对区域碳循环过程有较大影响。
In order to better understand the impact of the winter wheat growth on regional carbon cycle in China,this study used a meteorological model online coupled with a vegetation photosynthesis and respiration module(WRF-VPRM)that considers winter wheat photosynthesis and respiration,as well as soil microbial respiration,to simulate the CO_(2) fluxes during the growth of winter wheat in China in 2020.The results showed that the model could reasonably simulate the spatiotemporal variation characteristics of CO_(2) flux,surface CO_(2) concentration,and atmospheric CO_(2) column(The agreement index,IOA reached 0.64-0.89).The impact of carbon flux on atmospheric CO_(2) during winter wheat growth mainly occurred in spring,with the strongest photosynthesis during heading stage and the strongest respiration during maturity stage,showing obvious seasonal characteristics.The growth process of winter wheat significantly affected the atmospheric CO_(2) concentration near the ground in North China,and the degree of influence varied greatly in different phenological periods,with the most significant decrease occurring during the heading stage of winter wheat,reaching 8.33μmol·mol-1.Spatially,the absorption of CO_(2) by winter wheat at the border of Henan and Anhui provinces was more pronounced,with CO_(2) concentration reduction exceeding 20μmol·mol^(-1)during heading stages.Winter wheat was an important participant in the carbon cycle of terrestrial ecosystems in the study area in spring,accounting for 40%.The net absorption of atmospheric CO_(2) by the entire growing season in 2020,calculated as C,reached 422.53 g·m^(-2),which has a significant impact on the regional carbon cycle process.
作者
刘静
孙伟伟
徐宏辉
赵淑雨
刘围围
杨刚
陈镔捷
任丽燕
冯添
LIU Jing;SUN Weiwei;XU Honghui;ZHAO Shuyu;LIU Weiwei;YANG Gang;CHEN Binjie;REN Liyan;FENG Tian(Department of Geography and Spatial Information Techniques,Ningbo University,Ningbo 315211,China;Zhejiang Institute of Meteorological Science,Hangzhou 310017,China;Ningbo Meteorological Bureau,Ningbo 315012,China)
出处
《农业环境科学学报》
CAS
CSCD
北大核心
2024年第10期2401-2415,共15页
Journal of Agro-Environment Science
基金
国家重点研发计划项目(2020YFA0607502)
宁波市“科技创新2025”重大专项(2022Z189,2022Z032,2023Z139)
浙江省自然科学基金联合基金项目(LZJMZ23D050002)。
