改良盐碱土和种植技术对土壤性质和树木成活率的影响

该试验在利用燃煤脱硫废弃物和改良剂改良土壤回填土的同时改良种植技术,即对树坑底部采取四种不同的垫层(无处理、稻草+黄沙垫层、黄沙垫层、石子+黄沙垫层),研究了改良的盐碱土和不同垫层对植树后坑内土壤的pH值和全盐含量和树木成活率的影响。试验结果表明:1)3个处理区不同深度土层的平均pH值较试验前下降了9.01%～12.10%(P0.01);对照区不同深度土层的平均pH值均有增加。试验区内稻草+黄沙垫层pH值降低效果最好(P0.05)。2)3个处理区不同深度土层的平均全盐含量较试验前下降了1.62%～67.59%(P0.01);对照区不同深度土层的平均全盐含量增加22.37%～58.21%。3个处理区稻草+黄沙垫层全盐含量降低效果最好(P0.05)。在树木种植后的45d、75d和165d分别测定了成活率,试验组间差异不显著(P0.05);3个处理与对照比较差异极显著(P0.01):国槐的成活率处理组比对照提高了28.7%～31.1%;白腊的成活率处理组比对照提高了88.3%～112.6%;云杉的成活率处理组比对照提高了46.0%～48.0%;西府海棠的成活率处理组比对照提高了26.5%～33.6%。

Influence of improved soil of alkaline-saline and planting techniques on soil properties and survival rate of trees

Soil was improved by flue gas desulphurization from coal-fired power plant and krilium before soil was filled into tree well,meanwhile,three different cushion rubbers were placed at the bottom of three well(haulm + sand,sand,cobblestone + sand).Soil pH,soil total salt content and tree survival rate were measured in this study.The results of this study showed that the average pH of different soil depths in the treatment plots decreased by 9.01%~12.10%(P<0.01),whereas that in the control plots increased gener...