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采取路线调查与典型调查方式,对湘西地区部分在建和建成高速公路弃土场的表层土壤进行了采样,并对其肥力状况进行了测定。结果表明:湘西地区已建成高速公路调查弃土场的有机质、碱解氮、有效磷以及速效钾平均含量分别为8.04～13.46g/kg、13.29～16.40mg/kg、14.6～16.7mg/kg以及66.3～86.2mg/kg,在建高速公路调查弃土场的有机质、碱解氮、有效磷以及速效钾平均含量分别为38.65g/kg、5.24mg/kg、16.4mg/kg、123.7mg/kg;随时间的推移,湘西地区高速公路弃土场表层土壤中有机质、有效磷以及速效钾含量呈下降趋势,碱解氮总体呈上升趋势;湘西地区高速公路弃土场植被自然恢复的速度较快,可以采取封育治理等自然恢复措施。
Taking the route survey and the typical survey way, the surface soils of some highway under construction and built in western Hunan were sampled and their fertility status was measured. The results showed that the average contents of organic matter, available nitrogen, available phosphorus and available potassium in spoil grounds of the completed expressway in western Hunan were 8.04-13.46 g / kg, 13.29-16.40 mg / kg and 14.6-16.7 mg / kg, respectively 66.3-86.2mg / kg. The organic matter, alkali-hydrolyzable nitrogen, available phosphorus and available potassium in spoil grounds surveyed by the highway under construction were 38.65g / kg, 5.24mg / kg, 16.4mg / kg and 123.7mg / kg respectively Over the years, the contents of organic matter, available phosphorus and available potassium in the surface soil of expressway spoilage in western Hunan showed a decreasing trend, and the total amount of soluble nitrogen in the surface soil of the expressway in western Hunan showed an upward trend. , You can take the natural restoration measures such as sealing management.