The Effection Of Vegetation Restoration On Soil Environment In Wasterland Of Manganese Mine In Xiangtan

This dissertation studyed on the soil environment in the Xiangtan manganese mine wasteland improvement by different vegetation restoration ways. It could supply reference for restoration of the Xiangtan manganese mine wasteland and degeneration ecosystem of Hunan province or all over the country. The main results of the research are as follows:The soil average water content in different restoration plots were ranked as follows:The comparison plot> the artificial restoration plot>the naturally restoration plot; in surface layer soil (0-20cm), the soil bulk density (g/cm3) were:restore naturally plot (1.65)> The comparison plot (1.49)> the artificial restoration plot (1.40); The soil particle composition in the artificial restoration plot mainly was sandy silt, and few of fine sand; in the naturally restoration plot was coarse sand, and in the comparison plot was silt loam. The mean value pH in the artificial restoration plot is 7.59; in the natural restoration plot is 4.91, which is slightly is higher than the comparison place 4.49. The soil nutrient content in different plots ranked in:the artificial restoration plot> the naturally restoration plot> the comparison plot.The variety rule of Soil microbe quantity in different plots was as follows:The bacterium quantity in three main microorganisms of soil was the most, In different plots, the bacterium and the fungi quantity ranked in such rule:the artificial restoration plot> the comparison plot> the naturally restoration plot, which existed significant difference (p<0.05); but the actinomycetes quantity ranked in the naturally restoration plot> the artificial restoration plot> the comparison plot, which existed no significant difference (p>0.05). The microorganism quantity of soil in different plots decreased gradually with depth deeper. The change tendency of Soil microbe quantity existed significant difference (p<0.01) during the different months. The bacterium and the fungus quantity changed in such tendency:September> July> May> November But the actinomycetes quantity change tendency is not similarly obvious in different plots.The vertical distribution rule of soil enzyme activeness decreased with the depth of soil. The urease activeness of the artificial restoration plot and the naturally restoration plot seasonally changed in such rule:July> May> November> September. But the urease activeness in May of the comparison plot is the highest, in September is the least. During the different month the change tendency is:The man-power restores on the forest land July> May> November> September; the nature restores ground, then displays for May> in September> in July> in November; But compares on the forest land, then displays May> November> September> July. During different month change tendency:The man-power restores in the forest land:May> July> November> September.There is obvious correlation among soil microbe quantity and organic matter, N and P (p<0.05). But the correlation changes with the microbe breed In soil in microorganism quantity and soil organic matter, entire N and entire P content existence remarkable relevance (p<0.05); The Fe element content assumes the remarkable inverse correlation with the soil in (p<0.05), but other Ni, Zn, Mn, Pb, Cd six kind of elements in certain extent soil microorganism quantity performance for relevance.In the soil in the urease, the catalase and the sucrase and the soil the entire K content assumes the extremely remarkable inverse correlation (p<0.001); With the soil in entire Mg, the organic content assumes is extremely remarkable is being related (p<0.001); Between the catalase and the sucrase and the heavy metal have not displayed the remarkable correlationa dependence (p>0.05), but in the soil in the urease and the soil Ni, Zn, Mn, Pb, between the Cd heavy metal element displays the remarkable correlational dependence (p<0.05), explained that in the soil the urease is more sensitive to the heavy metal compound pollution.In soil besides urease activeness and soil bacteria, fungus, ray fungi quantity correlational dependence not big, in the soil catalase activeness and the bacterium, the fungus, ray fungi quantity become obviously extremely related (p<0.001); The sucrase and the bacterium, the fungus, ray fungi quantity assume obviously related (p<0.05).According to the soil fertility synthetic evaluation analysis to three type plots, the soil fertility synthetic evaluation index in various layers in different plots ranked in: the surface layer> the subsurface layer> deep layer and existed significant difference (p<0.01); in different plots but the same layer, the index of soil fertility synthetic evaluation ranked in:The comparison plot> the artificial restoration plot>the naturally restoration plot. It shows that the soil fertility in Xiangtan manganese mine wasteland, which has been filled with city garbage, calcareous and gangue slob, has been improved; what's more, the soil fertility in the artificial restoration plot id higher than that in the naturally restoration plot. Thus it also shows that the soil ecological environment benefit, which had been destroyed, in Xiangtan manganese mine wasteland, has been amended by the artificial vegetable restoration. It also can explain vegetable restoration the mining wasteland is feasible.