关键词: 盐地碱蓬, 播种量, 滨海盐碱土, 土壤酶活性, 土壤团聚性

Abstract: In order to study the effect of different seeding rates of Suaeda salsa on the restoration of saline-alkali soils in coastal region, a field experiment was used to set up seeding of 0 (CK), 30 (SF), 45 (LF), and 60(BF)kg·hm^-2. The effects of different seeding rates on soil enzyme activity and aggregation of coastal saline soil were studied. The results showed that different planting rates of Suaeda salsa had different effects on improving the nutrient status, reducing total salt content, increasing enzyme activity and enhancing soil agglomeration. The soil improvement effect of coastal saline soil under LF treatment was the best. Compared with CK, the total salt content in the soil under LF treatment was reduced by 42.48%, while the organic matter content and the catalase activity were increased by 80.52% and 30.24%, respectively, and soil agglomeration was enhanced. BF treatment was followed, which the alkaline phosphatase activity was increased by 256.67%, the average soil weight diameter was increased by 64.38%, and the percentage of soil aggregates was increased by 37.51%. Therefore, the sowing of 45 kg·hm^-2 Suaeda salsa could significantly improve the soil environment of coastal saline-alkali soils by reducing soil salinity and increasing the content of soil organic matter. The research provided theoretical basis and technical support for salt-accumulating phytoremediation of saline-alkali soils.

Key words: Suaeda salsa, seeding amount, coastal saline-alkali soil, soil enzyme activity, soil aggregation