Effects of different vegetation restoration methods on contents of mineral elements in slope soil of Longcha highway

In order to determine the effects of different vegetation restoration methods on the soil，the contents of mineral elements，pH value and organic matter in slope soil were determined after treated for one year. The results showed that the nitrogen element content of samples with planting Verbena tenera，Photinia × fraseri and Rhododendron simsii increased the most，8.6 times of that of new soil. The phosphorus content of sample treated with coconut network protection plus spray sowing soil increased the most，which was 8.3 times of that of new soil， while the phosphorus content of sample treated with Indigofera pseudotinctoria increased by 7.7 times. The potassium content of sample treated with coconut network protection plus spray seeding increased the most，6.5 times of that of new soil. The Magnesium content of sample with I. pseudotinctoria increased the most，4.6 times of that of new soil. The pH values were less than 7 except the sample treated with Amorpha fruticosa. Compared to the new soil and coal gangue，the contents of organic matters of all treatments greatly improved，but far less than those of natural community. The organic matter content of sample treated with coconut network protection plus spray sowing increased the most，11 times of that of new soil. The organic content of the sample with planting I. pseudotinctoria and sample with glass were high. The less increase of organic matter content was found in the sample with Sedum lineare，4 times of that of new soil. Those results show that the coconut network protection plus spray sowing technology is the most suitable for the slope revegetation，because it could increase the contents of mineral elements in the soil and organic matter content in a relatively short time，which is conducive to the growth of plants.