橡胶林通量足迹与源区分布

目的]分析橡胶林通量观测数据质量。方法]根据农业部儋州热带农业资源与生态环境重点野外试验站50米高通量观测塔2010年前6个月连续的通量观测资料,应用Schmid（1994）的FSAM（Flux-Source Area Model）模式分析不同大气条件下橡胶林干季通量足迹与源区分布特征。结果]不稳定条件下,传感器测得的通量信息源区比稳定条件时源区面积相对小;相同水平下非生长季的信息源区比生长季的信息源区大。在主风方向130°～270°,生长季不稳定条件下,通量测量的信息源区（P=80%）迎风方向范围在100～758m之间,垂直于迎风方向范围在-251～251m之间,非生长季不稳定条件下,迎风方向和垂直迎风方向的范围较均值略大些;生长季稳定条件下,分别为173～1858m,-534～534m,非生长季稳定条件下,迎风方向和垂直迎风方向的范围较均值略小些。风向在0°～130°、270°～360°时,相同大气条件下,其范围与主风向生长季的范围近似。结论]该研究为进一步通量计算和分析奠定了基础。

Fluxes Footprint and Source Area of Rubber Plantation

Objective] The paper was to analyze the quality of flux observation data of rubber plantation.Method]Based on the FSAM model,footprint and flux source area were analyzed according to the continuous flux measurement with the open-path eddy covariance system on the 50 m tower of Danzhou Key Field Station of Observation and Research for Tropical Agricultural Resources and Environments,Ministry of Agriculture from Jan 1 to Jun 30,2010.Result] Under unstable stratification,source areas were smaller than those under stable conditions,and source areas in the dormant season were larger than those in the growing season at the same level.In the main wind direction 130°-270°,the upwind range of source areas was in the magnitude of 100-758 m and vertical upwind range was-251-251 m at 80% level under unstable stratification in the growing season,and they were some large than those under the unstable stratification in the dormant season.The source areas of the upwind and vertical upwind ranges were 173-1 858,-534-534 m especially under stable stratification in the growing season,and they were smaller than those under stable stratification in the dormant season.In the other wind directions of 0°-130° and 270°-360°,the ranges were similar to those of the growing season in the prevailing wind direction under the same atmospheric conditions.Conclusion] The study would lay a foundation for the future flux calculation and analysis.