Study On The Propagation Of Selected Plants And Their Growth Adaptability In Saline Soil

To plant in saline-alkali soil and saline soil is a tough work, its success depends on the soil development and the selection of suitable plants.There are large area of saline soil in Shanghai, with the acceleration of new city construction,the speed of tree planting needs to be quicker and quicker. As the high cost of planting in saline soil, people now pay more attention to the selection of salt resistant plants, but there are little garden plants suit the saline environment so far, some native plants suit, but the seedlings limit, so does the development of planting in saline soil. It has both theoretical significance and application value to conduct study on the adaptability of plants and their propagation skills.This paper choices three kinds of plant to conduct the experiment of the adaptability compare and the propagation skills. The first type is the native plant adapts to saline soil, such as Salix matsudana Koidz., the second type is salt resistant species from other places, such as Lespedeza bicolor Turcz., Amorpha fruticosa L., and Caragana korshinskii Kom., the third type is garden plants well applicated in Shanghai, such as Rosa multiflora Thunb. ex Murr., Kerria japonica (L.) DC., Salix integra Thunb., Forsythia suspensa (Thunb.) Vahl, the followings are the results:1. Study on seedling propagation techniques(1) The root rate of Salix matsudana Koidz..could be increased to98%by adding garden soil and peat matrix to saline soil matrix, the root number also increased. With the Increase in volume of peat matrix, the root rate and number increased at the same time. By using IBA rooting powder of1000mg/L, the root rate of Salix matsudana Koidz., even could be raised to100%(2) By refining the saline soil and reducing its Salt content in lingang new city, the average root length of this four plants in garden soil could be2times of that in lingang soil. The root effect of Rosa multiflora Thunb. ex Murr. was the best comparing with three other plants in the three matrix, while the Forsythia suspensa (Thunb.) Vahl was the last.(3) Through making different preparation matrix,found the significant germination rate of substrate types, plus green matrix or Jane soil to the garden soil matrix, made the seed germination rate increase1-2times; The germination rate of Lespedeza bicolor Turcz. is higher than other plant, seedling stage required a short time; In the greenhouse, the condition could greatly improve the germination rate of plant.2.Study on suitability of seedling on salt soil (1) By planting four species in different habitats to study their growth, we could find the uphill was more suitable for plant to grow, as the plant growed faster and had a high survival rate; Only the Rosa multiflora Thunb. ex Murr. and Forsythia suspensa (Thunb.) Vahl could be survived in the downhill bare land, the growth amount was not high; The four plants in the grass habitat, death occurred since planting, all plants were dead after50days. Compared the growth of these plants in three kinds of habitats, Rosa multiflora Thunb. ex Murr. have the fastest growth rate, its rates were both more than90%in upper and lower bare land,the height increase of single branch was119.45cm in the uphill habitat. Comprehensive comparison, The ability to adapt of Rosa multiflora Thunb. ex Murr. was the strongest.(2) By planting the four species plant in the habitats of different saline level, we could conclude: when the salt content was6.21g/kg, most leaves of Salix Integra Thunb. were dry, but only a few leaves of the other three kinds of plants were dry with light green leaves and phenomenon of insects eating.When the salt content was9.66g/kg, all four plants could not grow normally,both Salix integra Thunb. and Kerria japonica (L.)DC died on September, the leaves of Forsythia suspensa (Thunb.) vahl and Rosa multiflora were little dry.Four plants could be classified by the degree of salt resistance, the first class was Rosa multiflora Thunb. ex Murr., it was mild salt demaged.the second class wasForsythia suspensa (Thunb.) Vahl., it was moderate salt demage; the third class was Kerria japonica (L.) DC., it was severe salt damage; the fourth class is Salix integra Thunb.,it was very severely salt damaged.(3) By conducting the methods of weeding and not weeding and comparing the growth of the shrubs within two months, we can find shrub grew large suppressively.