碱蓬播种量对滨海盐碱地土壤酶活性和团聚性的影响

为研究盐地碱蓬(Suaeda salsa)不同播种量对滨海盐碱土的修复作用，采用大田试验，设置撒播0（CK）、30 (SF)、45 (LF)和60(BF)kg·hm^-2 4种播种量处理，研究不同播种量对滨海盐碱地土壤理化性质的影响。结果表明，盐地碱蓬不同播种量对滨海盐碱地土壤全盐量、有机质、土壤酶活性和土壤团聚性的改良存在一定差异。其中， LF处理下，滨海盐碱地土壤改良效果最佳，与CK相比，土壤全盐量降低42.48%，有机质含量增加80.52%，过氧化氢酶活性提高30.24%，土壤团聚性增强。其次是BF处理，碱性磷酸酶活性提高256.67%，土壤平均重量直径增加了64.38%，土壤大团聚体所占百分比增加了37.51%。因此，盐地碱蓬45 kg·hm^-2的播种量能够显著降低土壤盐分、提高土壤有机质含量、改良土壤理化性质，从而改善滨海盐碱地土壤环境，为积盐植物修复盐碱地提供理论基础与技术支持。

Effects of Suaeda Planting Rate on Soil Enzyme Activity and Aggregation of Coastal Saline Alkali Land

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.