林业板块1月20日跌3.88%，平潭发展领跌，主力资金净流出2.89亿元

Group 1 - The forestry sector experienced a decline of 3.88% on January 20, with Pingtan Development leading the drop [1] - The Shanghai Composite Index closed at 4113.65, down 0.01%, while the Shenzhen Component Index closed at 14155.63, down 0.97% [1] - Key stocks in the forestry sector showed mixed performance, with ST Jinggu rising by 2.59% and Pingtan Development falling by 5.85% [1] Group 2 - The net outflow of main funds in the forestry sector was 289 million yuan, while retail investors saw a net inflow of 329 million yuan [1] - Detailed fund flow data indicated that Fujian Jinsen had a net inflow of 372,400 yuan from main funds, while ST Jinggu had a net outflow of 251,200 yuan [2] - Pingtan Development showed a significant net outflow of 289 million yuan from main funds, despite a net inflow of 327 million yuan from retail investors [2]