基础建设板块9月15日涨0.42%，园林股份领涨，主力资金净流出2.93亿元

Group 1 - The infrastructure sector increased by 0.42% on September 15, with Garden Co. leading the gains [1] - The Shanghai Composite Index closed at 3860.5, down 0.26%, while the Shenzhen Component Index closed at 13005.77, up 0.63% [1] - Key stocks in the infrastructure sector showed significant gains, with Garden Co. rising by 10.01% to a closing price of 18.79 [1] Group 2 - Major stocks in the infrastructure sector experienced mixed performance, with some stocks like Huylv Ecological and Nongshang Environment declining by 8.13% and 4.67% respectively [2] - The infrastructure sector saw a net outflow of 293 million yuan from institutional investors, while retail investors contributed a net inflow of 190 million yuan [2][3] - The top stocks by net inflow included Construction Co. with 93.48 million yuan and Eastern Garden with 67.06 million yuan [3]