防治城市绿地土壤次生盐渍化的改良材料研究

Study on the Improved Material of Preventing the Urban Green Space Soil Secondary Salinization

土壤次生盐渍化已成为阻碍城市绿地植物生长的主要问题,其中融雪剂的大量使用是导致哈尔滨市绿地土壤次生盐渍化加剧的一个重要因素。目前施用的土壤改良剂存在见效慢、效果不明显等问题。为了降低哈尔滨市绿地土壤盐分含量,采用二次回归正交试验设计,对褐煤腐植酸、沸石、玉米秸秆、磷石膏进行复配。结果表明,褐煤腐植酸、沸石、玉米秸秆和磷石膏对降低土壤盐分含量有极显著影响;改良城市绿地土壤盐渍化的最佳组合为每2 kg土壤(干重)施用褐煤腐植酸63.6 g、沸石14.4 g、玉米秸秆12.2 g、磷石膏3.9 g。

Soil secondary salinization has become the main problem which hinders the growth of plant in urban green space. The usage of large amount of snow melting agent is an important factor that leads to increase the secondary soil sa-linization in Harbin urban gardenland. Former application of soil ameliorant had some problems： slow and unclear effect, etc.. In order to reduce the soil salt content in Harbin urban green space, compound lignite humic acid, zeolite, corn straw and phosphorus gypsum were used in two times regression orthogonal experiment. The results showed that lignite humic acid, zeolite, corn straw and phosphorus gypsum all had signiifcant effects on reducing soil salinity. The best combination for reducing the urban garden soil salinity was 63.6g lignite humic acid, 14.4g zeolite, 12.2g corn straw, 3.9g phospho-rus gypsum per 2kg soil （dry weight）.