滨海盐渍土改良剂的筛选及应用效果研究

针对天津滨海盐渍土结构性差、土壤养分匮乏、脱盐碱化现象严重等问题，进行了改良剂改良滨海盐渍土的试验研究。盆栽试验通过综合分析土壤含盐量、土壤养分含量、黑麦草长势情况，筛选出效果最佳改良剂配方。野外应用效果试验进一步表明，施用改良剂能抑制土壤脱盐碱化，提高土壤养分含量、明显改善土壤结构和肥力状况。土壤水解氮、速效磷、速效钾、有机质含量分别提高了123.8%、171.0%、22.0%、37.5%，土壤容重降低了15.54%，土壤总孔隙度增加了19.66%，土壤渗透性提高了127.78%，土壤微结构由面状孔隙转变为复杂堆积型孔隙。改良剂的施用非常利于土壤水肥气热状况的调节，是天津滨海盐渍土适宜的盐碱改良剂。

Selection and Application Effect of Soil Amendments on Coastal Saline Soil

According to the exit soil problems about bad soil structure, nutrient deficiency and desalting alkalization on coastal saline soil, the experiments were carried out on improving saline soil by using soil amendments. The pot experiment was selected the best amendment by synthetically analyzing the soil salt content, soil nutrients content and growth of regrass. The field application effect showed that the amendments could prevent desalting alkalization and improve soil nutrient content, soil structure and soil fertilizer. Soil alkaline hydrolytic nitrogen, available phosphorus, available potassium, organic matter were individually increased 123.8%, 171.0%, 22.0%, 37.5%. Soil bulk density was reduced 15.54%, soil porosity and soil infiltration were increased 19.66%, 127.78%. Soil microstructure was produced the transition from plane voids to complex packing voids. Using amendments was good to adjust water, fertilizer, air and heat, it was suitable soil amendment on coastal saline soil.