半干旱区农田和草地与大气间二氧化碳和水热通量的模拟研究  

Simulation of CO_2 and Sensible/Latent Heat Fluxes Exchange between Land Surface and Atmosphere over Cropland and Grassland in Semi-Arid Region

作　　者：姜纪峰[1,2] 延晓冬[2] 黄耀[1,3] 郭维栋[2] 刘辉志[3] 王淑瑜[2] 

机构地区：[1]南京农业大学资源与环境科学学院,南京210095 [2]中国科学院大气物理研究所东亚区域气候-环境重点实验室,全球变化东亚区域研究中心,北京100029 [3]中国科学院大气物理研究所大气边界层物理和大气化学国家重点实验室,北京100029

出　　处：《气候与环境研究》2006年第3期413-424,共12页Climatic and Environmental Research

基　　金：中国科学院知识创新工程重要方向项目KZCX3-SW-218;国家重点基础研究发展规划2002CB412503

摘　　要：集成生物圈模型(IBIS)是目前最复杂的基于动态植被模型的陆面生物物理模型之一。通过应用该模型对国际协调强化观测计划(CEOP)半干旱区基准站之一的吉林通榆观测站(44°25′N,122°52′E)草地和农田生态系统2003年全年的CO2和水、热通量变化进行模拟,并将结果与涡度相关法测定的观测值进行了对比分析,以检验IBIS模型在半干旱区的模拟能力。对比结果表明:除CO2通量模拟结果不够理想外,IBIS模型较好地模拟了通榆观测站的感热通量和潜热通量。模拟与观测比较的相关系数均通过了0.05以上显著性水平的信度检验。总体上看,模型对农田生态系统模拟的偏差小于对退化草地的模拟。The Integrated Biosphere Simulator （IBIS） is one of the most sophisticated models in simulating terrestrial biosphere processes based on dynamic vegetation schemes. For the purpose of validating IBIS in semi-arid region and eventually improving the model＇s capability for specific land cover types in China, a simulation for the whole 2003 year was conducted over cropland and degraded grassland in Tongyu field observation station （44°25′N, 122°52′E） in Jilin Province of China, which is one of the reference sites of international Coordinated Enhanced Observing Period （CEOP）. Model inputs include the site ecosystem characteristics and main meteorological variables. Comparisons between simulated land surface fluxes and observed eddy covariance （EC） measurements show that the model is capable of reproducing CO2, sensible and latent heat fluxes indicated by correlation coefficients exceeding the significant level of 0.05. In general, CO2 flux and sensible heat flux have obvious diurnal and seasonal variation both at the grassland and the cropland, while the latent heat flux, which is related to evapotranspimtion, only has diurnal variation during the growing season. Meanwhile, all fluxes at the cropland are larger than those at the degraded grassland, especially in the growing season, and one of possible reasons for these is that crops grow much better than degraded grass. The model generally estimates lower annual CO2 （underestimating 9. 29% in the grassland and 3. 73% in the cropland） and latent heat flux （with corresponding percents 4. 63% and 3. 48%）, and greater annual sensible heat flux （overestimating 9.90 M and 11.98 %, respectively） than measured by EC. And the simulations for the cropland are better than those for the grassland, with more reasonable model-measurement agreements.

关 键 词：IBIS模型 CO2通量 感热通量 潜热通量 

分 类 号：P435[天文地球—大气科学及气象学]