淮南地区采煤塌陷湿地氮素分布特征的初步研究
首发时间:2009-09-17
摘要:采煤塌陷湿地是在人为干扰下形成的一类特殊水体。通过对淮南地区潘北矿采煤塌陷湿地水体、沉积物和土壤中各种形态氮素分布特征的研究表明,水体中含量相对较低,沉积物中含量最高;在塌陷形成的斜坡的表层土壤中,总氮和硝态氮沿斜坡从低处季节性积水区到高处非积水区基本呈现了逐渐降低的趋势,而铵态氮则呈现出相反的趋势。这基本说明了采煤塌陷会导致水体周围农田中的氮素沿斜坡流失并积聚在水体沉积物中。
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Distribution Characteristics of Nitrogen on Coal Mining Subsidence Wetland in Panbei Coal Mine
Abstract:Coal mining subsidence forms anthropogenic wetland. Nitrogen was selected as the biogeochemical indicator to address the environment effect of coal mining subsidence wetland in Panbei Coal Mine, Huainan. Contents of total nitrogen (TN), NO3-N and NH4-N of water, sediment and topsoil in coal mining subsidence wetland were measured. Distribution characteristics of nitrogen (in various forms)contents in water, sediments and topsoil in coal mining subsidence wetland indicated that their contents in water were relative lower, and highest contents in sediments were found, which reflected the nutrient absorption and accumulation in the sediment. In Panbei coal mining, the characteristics of distributions of nitrogen contents in topsoil of coal mining wetland generally decreased along the slope from flooded area to top of the basin. The phenomena indicated that the gradient formed by coal underground mining led to the nutrient losses in cropland and nutrient accumulaiton in sediments of catchment.
Keywords: coal mining subsidence wetland nitrogen distribution characteristics
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No.3524747720112531****
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