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对辽河三角洲区域内典型的泥质海岸盐碱地段进行工程整地修筑台田,利用耐盐碱牧草苜蓿、田菁构建银中杨+苜蓿、银中杨+田菁两种林草生态模式,以银中杨纯林为对照进行改土效果研究,结果表明,3种模式林分郁闭度达到90%以上,保存率在89%以上,银中杨+苜蓿模式能显著促进树高、胸径生长,树高和胸径分别比银中杨+田菁模式和CK增加15.8%、16.7%和15.8%、16.6%。脱盐改土作用是银中杨+苜蓿模式好于银中杨+田菁模式好于CK;银中杨+苜蓿模式可显著降低土壤全盐量、pH、容重,增加土壤孔隙度,改善土壤水分状况,同时还能提高土壤有机质、全氮、全磷总量,增加土壤氮、磷有效性;其中,对0～10 cm土层的改良效果要好于10～30 cm土层和30～50 cm土层。
In the Liaohe River Delta region, the typical arboreous salty saline-alkali landslide site was constructed for the construction of Taitian. Using saline-alkali-tolerant alfalfa and Scutellaria barbata, two ecological models of Agropyrophytes yinzhong + Medicago sativa, Yang Chunlin was used as control to study the effect of soil improvement. The results showed that the canopy density reached more than 90% and the conservation rate was above 89% in three types of canopy. The model of Yinzhong + alfalfa could significantly promote the growth of tree height and DBH, And DBH increased by 15.8%, 16.7% and 15.8% and 16.6% respectively compared with that of Populus euphratica + Sesbania. The effect of desalination and soil improvement is that the mode of Yinzhong + alfalfa is better than the model of Zhongzheng + Yinjing and the model of CK is better than CK. The model of Yinzhong + alfalfa can significantly reduce the total salt content, pH and bulk density of the soil, increase the soil porosity and soil moisture While improving the total organic matter, total nitrogen and total phosphorus in the soil and increasing the availability of nitrogen and phosphorus in the soil. The improvement effect on 0 ~ 10 cm soil layer was better than that in the 10 ~ 30 cm soil layer and 30 ~ 50 cm soil layer Soil layer.