南宋大诗人、哲学家朱熹有诗云:“半亩方塘一鉴开,天光云影共徘徊;问渠那得清如许?为有源头活水来。”其中的美景令人遐想。山城重庆璧山县有群众说,他们的璧南河昔日也是如诗如画,是当地人的骄傲。然而,近年来璧南河流域渐渐被污染,而且越来越严重,已是不争的事实。 Southern Song Dynasty poet, philosopher Zhu Xi poem: “half an acre square a Kam Kai, a total of wandering clouds of light; ask that canal clear that? For the active living water to come.” One of the beauty is reverie. There are crowds in the mountain town of Bishan County, Chongqing. Their Bi Nan River was also picturesque in the past, and it is the pride of the locals. However, in recent years, the Pennan River Basin has been gradually polluted and more and more serious. It is an indisputable fact.