水稻不同生长期稻田能量收支、CO_2通量模拟研究

MODELING OF ENERGY AND CO_2 FLUXES DURING DIFFERENT GROWTH PERIODS OVER RICE FIELD BY USING SIB2

利用国家自然科学基金重大项目“长江三角洲低层大气物理化学过程与生态系统的相互作用”野外观测资料 ,将 1 999年常熟稻田水稻四个不同生长期 (插秧、拔节、抽穗和成熟 )的太阳辐射、水汽压、气温和水平风速及降水作为简化生物圈 (SiB2 )模式的 5个强迫变量 ,在合理设计模式参数的前提下 ,分别模拟了上述四个阶段的能量收支、CO2 通量。模拟结果表明 :在水稻不同生长阶段的感热、潜热和下垫面热通量占净辐射的比例不同 ;CO2 通量的模拟结果与 1 996年国际稻田试验结果相似。该研究为利用自动气象站网的资料估计各站能量收支、CO2 通量、土壤水分平衡。

SiB2, forced by five meteorological variables, was adopted to model the energy budget and CO 2 flux during stem extension, tassel and mature period over rice field in Changshu country of Jiangsu province, China. These meteorological variables are solar radiation, vapor pressure, air temperature, horizontal wind speed and precipitation from in situ observation. Result shows that the energy partitions over these periods are different, so do CO 2 fluxes. The related results are close to those of IREX96. The SiB2 was demonstrated with automatic weather station(AWS) data and could be used to estimate the energy components, CO 2 flux, soil wetness and soil temperature profile.