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以铜尾矿砂为盆栽基质,加入不同比例腐熟风干巢湖底泥为处理模式,盆栽3种豆科植物菽麻(Crotalaria juncea)、紫穗槐(Amorpha fruticosa)和洋槐(Robinia pseudoacacia),研究巢湖底泥改良铜尾矿对豆科植物生长发育及基质无机氮素组分的影响.结果表明:1洋槐和菽麻叶绿素a、叶绿素b、叶绿素a+b值均表现最大;3种豆科植物叶绿素a/b比值在0.89至1.18之间,且随着巢湖底泥添加比例的增加,均有增大的趋势;在同一底泥比例处理方式中,菽麻叶绿素a、叶绿素b、叶绿素a+b值均显著高于紫穗槐和洋槐(P<0.05).2随着巢湖底泥比例的增加,3种植物叶片中SOD和POD酶活性均表现出逐渐变大的趋势.3添加巢湖底泥改良处理后,3种豆科植物生长的尾矿基质中均以硝态氮为有效氮的主要形态,达到总无机氮含量的85.5%~93.84%.4添加巢湖底泥改良处理后,尾矿基质中铵态氮、硝态氮含量分别表现为:紫穗槐是对照的1.00~1.34倍和1.18~1.57倍;菽麻是对照的1.33~3.24倍和0.74~1.10倍;洋槐是对照的0.85~1.16倍和1.03~1.09倍.综合分析表明,巢湖底泥可有效改良铜尾矿基质营养条件,促进植物生长;在改良条件下3种植物均可作为铜尾矿人工植物修复物种,其中菽麻最优.
Taking copper tailing sand as potting substrate and adding different proportions of matured dry Chaohu sediments, three kinds of leguminous plants Crotalaria juncea, Amorpha fruticosa and Robinia pseudoacacia were potted, The results showed that: 1 The chlorophyll a, chlorophyll b and chlorophyll a + b values of acacia and tabanua were the highest; the chlorophyll content of three leguminous plants a / b ratios ranged from 0.89 to 1.18, and both increased with the increase of sediment load in Chaohu Lake. In the same sediment proportion treatment, the contents of chlorophyll a, chlorophyll b, chlorophyll a + b (P <0.05) .2 As the proportion of sediment in Chaohu Lake increased, the activities of SOD and POD in the three plant species tended to increase gradually.3 Add the sediment of Chaohu Lake After the improved treatments, the main forms of available nitrogen in the three leguminous plant tailings were reached, which reached 85.5% ~ 93.84% of the total inorganic nitrogen.4 After adding Chaohu sediment, the tailings The contents of ammonium nitrogen and nitrate nitrogen in the matrix are as follows: Amorpha fruticosa is right According to the analysis, the sediments of Chaohu Lake were effective Improve the nutritional conditions of the copper tailings matrix, and promote plant growth; Under the improved conditions, the three kinds of plants can be used as copper tailings artificial plant repair species, of which the optimal flaxseed.