Liu Qin, male, Ph.D., associate researcher, deputy stationmaster of Jiangsu Changshu National Field Science Observation and Research Station of Farmland Ecosystem. In 1999, he received his Ph.D. degree from Nanjing Institute of Soil Research, Chinese Academy of Sciences. From October to December 23, he collaborated in research at Hohenheim University in Germany, from October to December 25 at Scottish Crop Research Institute, and from February to August 26, he was funded by Heinrich Hertz Fund to collaborate in research at Aachen University in Germany. Mainly engaged in the research work on nutrient cycling, pollutant migration and environmental effects of soil and farmland ecosystem.