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利用建植 7年的紫花苜蓿草地 ,研究了人工草地对滨海盐渍土壤盐分特性和肥力的影响。结果表明 ,与空白地相比 ,紫花苜蓿草地 0～ 40cm土层可溶性盐总量明显降低 ,脱盐率达 6 5 5 %± 1 6 % ,而底层变化较小 ;不同土层盐分运移存在离子差异性 ,0～ 40cm土层盐分离子降低幅度为 :Cl->Na+>SO2 -4 >Mg2 +>HCO-3 ,Ca2 +略有增加趋势 ,K+和CO2 -3 基本无变化 ;紫花苜蓿草地土壤肥力提高 ,0～ 2 0cm土壤有机质含量提高 2 8 43 % ,全氮含量提高 42 5 4%。
The effects of artificial grassland on salinity characteristics and fertility of coastal salinized soil were studied by using alfalfa grassland planted for seven years. The results showed that compared with the blank, the total amount of soluble salt in 0 ~ 40cm soil layer of alfalfa grass decreased significantly, the desalination rate reached 65.5% ± 16%, while the bottom layer changed little. The content of ions The difference of salt ions in 0 ~ 40cm soil layer was: Cl-> Na +> SO2-4> Mg2 +> HCO-3, Ca2 + increased slightly, K + The soil fertility increased, soil organic matter content increased by 2843% and total nitrogen content increased by 42 5 4% in 0 ~ 20 cm soil layer.