基质改良剂对滨海滩涂高钠盐粉土改良效果的试验研究

Test Study on Improving High Sodium Salt Floury Silt in Coastal Beach by Organic Substrate

采用桶栽试验,研究了不同施用量下,基质改良剂对江苏滨海高钠盐粉土理化性质及西红柿产量的影响。结果表明,与不使用改良剂处理(CK)相比,施用基质改良剂处理表层土壤干密度降低1.06%～9.39%,孔隙率增加1.10%～9.69%;土壤含盐量减少21.16%～25.64%;基质改良剂处理的土壤,其碱化度(ESP)、pH、土壤交换性Na+、土壤Na+和Cl-均较CK下降,且与基质施用量负相关;各处理土壤Ca2+和SO24-质量摩尔浓度分别较CK增加了150.00%～271.4%和3.8%～88.9%,且与施用量正相关。施用改良剂后,西红柿增产6.04%～30.95%,基质改良剂对江苏省滨海滩涂高钠盐粉砂土具有较好改良效果,其最佳施用量约为8.4～9.0t/hm2。

Different application amounts of organic substrate were used to study their effects on soil physical and chemical properties of the coastal high saline silt from Rudong,Jiangsu Province, as well as the tomato yield by pot experiments. The results showed that organic substrate could reduce soil bulk density by 1.06%-9.39% while increase soil total porosity by 1.10%-9.69% The total salt content of the treated soil with different amounts of organic substrate decreased by 21.16%-25. 64% compared with the control treatment（CK）. The soil exchangeable sodium percentage（ESP）, pH value（pH）, soil exchangeable Na^＋ , as well as concentration of Na^＋ and Cl^- also declined with the rising application amount of organic substrate. Ca^2＋ and SO4^2- concentration of the soil increased by 150.00%-271.4% and 3.8-88.9% respectively compared with CK. Tomato yield increased by 6.04%-30.95% compared with CK. The results above indicated that application of organic substrate was an effective way to improve coastal high sodium salt floury silt and the suitable application amount was about 8.4-9.0 t/hm^2.