Influence To Vegetation Restoration Of Soil Nutrients And Toxic Lements In Coal Wasting Lands

On the basis of analyzing and summarizing the domestic and international land reclamation and control techniques of coal wasting lands, applying ecology, forestry, agrology, environtology etc, utilizing field investigation and experiment, this paper researches discrepancy of soil nutrients and toxic elements in the different coal wasting lands and different extent of vegetation restoration, characteristics of plant absorbing toxic elements in coal wasting lands in Xinmi mining area, Yanzhou mining area and Tongchuan mining area. Furthermore, we firstly evaluate the pollution of soil heavy metallic elements in Tongchuan coal wasting lands by Geoaccumulation Index. The results showed as following:(1) There are significant differences in the content of soil nutrients in different coal wasting lands. Thereinto, there is a most significant difference in the content of available K between Xinmi mine and Yanzhou mine; there are significant difference in the content of total S and most significant difference in the content of hydrolysable N and available K between Xinmi mine and Tongchuan mine; there is a most significant difference in the content of total S between Tongchuan mine and Yanzhou mine.(2) There are significant differences in the content of toxic elements in different coal wasting lands. Thereinto, there is a most significant difference in the content of Cr between the random two in Xinmi, Tongchuan and Yanzhou mining area; there are significant difference in the content of Cu and most significant difference in the content of As between Xinmi and Yanzhou mining area; there are significant difference in the content of As and Cu between Xinmi and Tongchuan mining area; there is a significant difference in the content of As between Yanzhou and Tongchuan mining area.(3) There are significant differences in the content of soil nutrients in coal wasting lands in different extent of vegetation restoration. Moreover, with the increase of coverage rate of vegetation, the total N and organic matter content in the soil of coal wasting lands are increasing constantly, but content of hydrolyze N, available P, available K, total S and pH are reducing gradually. Thereinto, there is a most significant difference in the content of total N, Hydrolyze N and available P between 80% and 50% of coverage rate of vegetation; there is a...