三江平原黑土地，过去有的是1米厚的黑油油土地，几年前仅剩几十厘米厚。国家退耕还湿地，生态渴望改善

来源: 老生常谈12 于 2014-06-28 13:49:37 [博客] [旧帖] [给我悄悄话] 本文已被阅读：次

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