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沼泽是怎样形成的?

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沼泽是怎样形成的?

中国工农红军在1934~1935年的二万五千里长征中,曾走过漫漫草地,这zhong草地就是沼泽地。沼泽地大多分布在地表低洼的地区。在这zhong地区,地势低平,积水较多,气温较低,蒸发量很小。形成沼泽的原因有两zhong。一zhong是在江河湖海的边缘或浅水bu分,由于泥沙大量堆积,水草丛生,再加上微生wu对水草残ti的分解,逐渐游地段的沼泽区变成沼泽。另一zhong是在森林地带、草垫区、洼地和永久冻土带,地势低平,坡度平缓,排水不畅,地面过于chaoshi,繁zhi着大量的喜shixing植wu,这些植wu又霉烂形成黑se泥炭层,逐渐形成沼泽。沼泽地区的植被都是喜shixing草本科植wu,主要是莎草、苔草和泥炭聋。沼泽地不能长庄稼,有些沼泽下面是无底的泥潭,看上去好像mao绒绒的绿se地毯,人一踏上去就会陷进去。当年许多红军战士就是这样牺牲在沼泽地上的,因此,人们称它为"绿se陷阱"。现在越来越多的沼泽地正在被改造成良田。

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