| Trials were conducted in Ekenhuduge town in Alashan Youqi of inner Mongolia, Fine sand and thoroughly decomposed sheep manure were applied on the sulphuric-salinity soil to improve the soil. Shrubs, such as Amorpha fruticosa Linn, Tamarixramosissima。deciduous arbor, such as Robinia pseudoacacia Linn, Armaniaca sibirica Linn, Ulmus pumla Linn. ever-green arbor, such as Pinus sylvestris L. var. mongolica, herbaceous plants, such as Irls ensata Thunb, Medicago sativa Linn, Tall Fescue, etc. were planted. Research on the comparison of their adaptability reveals:Within the 60-cm-deep soil layer, salt content and PH value of the soil which is mixed with fine sand (the ratio between original soil and fine sand is 2:1) are obviously lower than that of the non-treatment soil (P＜0.05) . while the organic matter is higher, there is no obvious difference between the soil treated with thoroughly decomposed sheep manure (0.01 m~3/m~2) and the non-treatment (P＞0.05 ) soil. The performance of introduced plants grown in the soil mixed with fine sands (P＜0.05) are much better than that in the soil applied with thoroughly decomposed sheep manure and non-treatment soil; there's no obvious difference of plants' performance between the soil treated with thoroughly decomposed sheep manure and non-treatment soil (P＞0.05) . So it can be concluded that applying fine sand in the soil is an effective measure to improve soil, and its result is significant.The adaptability of introduced species from strong to weak are: Robinia pseudoacacia Linn＞Tamarixramosissma＞Amorpha fruticosa Linn＞Ulmus pumila L＞Armeniaca sibirica L＞Pinus sylvestris var. mongolica. Moreover, the adaptability of Robinia pseudoacacia Linn, Tamarixramosissima, Amorpha fruticosa Linn, lmus pumila L, Armeniaca sibirica L are all obviously stronger than that of Pinus sylvostris vat. mongolica (P＜0.01) . there are no sharp differences among Robinia pseudoacacia Linn, Tamarix ramosissima, Amorpha fruticosa Linn, Ulmus pumila L (P＞0.05), and the adaptability of Robinia pseudoacacia Linn and Tamarix amosissima (P＜0.05) are obviously stronger than that of Armeniaca sibiricn L。there are no obvious differences among Amorpha fruticosa Linn, Ulmus pumila L and Armeniaca sibirica L. Research on the comparison between the treatments of introduced species and the average importance value shows: the adaptability of different species from strong to weak are the same as the above, but the importance value of adaptability of different species are quite different from the above. The importance value of adaptability of Robinia pseudoacacia Linn and Tamarixramosissima are obviously higher than that of Ulmus pumila L, Armeniaca sibirica L and Pinus sylvestris vat. mongolica; the importance value of adaptability of Amorpha fruticosa Linn is obviously higher than that of Armeniaca sibirica L and Pinus sylvestris vat. mongolica, while extremely lower than that of Robinia pseudoacacia Linn, lower than that of Tamarixramosissima, and is no obvious difference with that of Ulmus pumila L; the importance value of adaptability of Ulmus puila L is extremely higher than that of Pinus sylvestris var. mongolica, and obviously higher than that of Armeniaca sibirica L; the importance value of adaptability of Armeniaca sibirica L is extremely higher than that of Pinus sylvestris var. mongolica. Meanwhile, in the treated soil, the importance value of adaptability of Robinia pseudoacacia Linn, Tamarixramosissima and Amorpha fruticosa Linn are all higher than 80%, while in the non-treated soil, only the importance value of Robinia pseudoacacia Linn is higher than 80%. To be concluded,such 3 species for garden beautification as Robinia pseadoacacia Linn, Tamarixramosissima and Amorpha fruticosa Linn can be successfully introduced through applying fine sand for soil treatment; and if the condition for improving soil is not favorable, Robinia pseudoacacia Linn can be successfully introduced and planted.Salt stress will weak the germination potential, germination rate and vitality of the seeds in the trial. The comprehensive analysis of the adaptability of seeds in the trial shows: the adaptability of seeds, from strong to weak, are Iris ensata Thunb＞Medicago sativa＞Tall Fescue. The average survival ratio to spend winter of Iris ensata Thunb and Medicago sativa are obviously higher than that of Tell Fescue (P＜0.05); there's no big difference of the average survival ratio to spend winter between Iris ensata Thunb and Medicago sativa (P＞0.05 ). The importance value of adaptability of Iris ensata Thunb and Medicago sativa are obviously higher than that of Tall Fescue, with a difference of over 20%; the importance value of adaptability between Iris ensata Thunb and Medicago sativa are almost the same, which means this two speci4es are strong in adaptability in the plot. In addition, large quantity of Tall Fescue will die in spring, and the coverage becomes lower and lower as the species growing in many years. From the. trial, it can be concluded that Iris ensata Thunb and Medicago satire are the species which are strong in salt and cold-resistance, and can be extended in a large area as a fine species for city beautification; Tall Fescue has weak integrated adaptability in the plot, and is not feasible to be extended in a large area.In the soil with heavy and normal salinity, the survival ratio of introduced species is directly related to the depth of root system. For most of the species whose roots are strong in salt-resistance, they can endure the stress of heavy salt and grow normally in summer and autumn, while part of them will be damaged in winter due to extremely low temperature. The Tall Fescue with shallow root which is introduced from foreign countries can endure the extremely low temperature, however, it may die in the next early spring. The reason is that large amount of salt will accumulate on the soil surface in spring, the shallow root, under the stress of heavy salt, will have poor vitality. Moreover, due to the big temperature difference in spring, the root of plants will be repeatedly frozen and melted, which will cause their death because of losing adaptability.
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