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黑土地被认为是肥力最高、最适合农耕的土地。我国东北黑土区是世界3个黑土区之一,是重要的商品粮基地。然而,曾经的黑土地,正在面临水土流失、土层变薄、肥力下降等问题。黑土面临“变薄”东北黑土区主要包括松嫩平原、三江平原、大兴安岭山前平原、辽河平原等地区。黑土层是土壤中的腐殖质层,其厚薄是黑土地土壤肥力的重要标志。目前大部分地区黑土层只有30厘米。除了肉眼可见的“破皮黄”现象,黑土层变薄
Black land is considered the most fertile land, the most suitable for farming land. The black soil area in Northeast China is one of the three black soil areas in the world and is an important commodity grain base. However, once the black land was facing such problems as soil and water loss, thinning of the soil layer and fertility decline. Black soil faces “thinning ” Black soil area in northeast China mainly includes Songnen Plain, Sanjiang Plain, Daxinganling piedmont plain, Liaohe Plain and other regions. The black soil layer is the humus layer in soil, its thickness is an important symbol of soil fertility in black soil. At present, the black soil is only 30 cm in most areas. In addition to the naked eye “broken skin yellow ” phenomenon, the black soil thinning