1. 第 28 讲 Application and Development of Agricultural System Model (RZWQM) 主讲人：Dr. Lajpat R. Ahuja 美国农业部农业研究局（USDA-ARS） 主持人：于 强 研究员 时 间： 2008年05月14日（星期三）09:00-10:30 地 点： 中科院地理科学与资源研究所2421会议室 （北京市大屯路甲11号） Dr. Lajpat R. Ahuja, soil scientist and research leader of great plains systems research unit in natural resources research center, worked for USDA-ARS. He discovered a mathematical similarity and a dimensional transformation for infiltration into crusted soils and a method to estimate both water retention curve and saturated conductivity from bulk density and field capacity, and a more general method to relate soil-water properties across dissimilar soil types; developed new simple power-form equations and Green-Ampt type models and an accelerated diffusion model and a non-uniform mixing model for estimating chemicals in runoff being used in EPA and industry models, and several new simpler methods of determining soil hydraulic properties and their spatial variability for applications. Now he focused on quantifying management effects on soil properties and processes, and development and national/international evaluation of ARS Root Zone Water Quality and GPFARM Decision Support System models. Dr. Lajpat R. Ahuja will introduce the application and development of agricultural model and some research in recent years. The experts and graduate students are welcome to the presentation. 主办单位：国家生态系统观测研究网络综合研究中心 中科院生态系统研究网络综合研究中心 中科院生态系统网络观测与模拟重点实验室