辽河的最上游，地处小腾格里、浑善达克两大沙地的交汇处。这里上古时期曾以“平地松林”命名。但是到了近代和现代，这里的生态环境却日渐脆弱起来。那绵亘千里的原始林海不知什么时候消失了，取而代之的天然次生林也越来越少，出现了许多流动、半流动沙丘。沙进林退，人们的 Liaohe most upstream, is located in small Tengger, Hunshandake two sand confluence. It was named “Pinus Pine Forest” in ancient times. However, in modern times and modern times, the ecological environment here is increasingly fragile. That stretch of thousands of miles of the original forest sea do not know when to disappear, replaced by the natural secondary forest is also less and less, there have been many mobile and semi-mobile sand dunes. Sand into the forest back, people’s