The Effect Of Phytoremediation On Soil Nutrient And The Content Of Heavy Metals In Mine Areas Wasteland

Because of the large accumulation of graphite gangue,the cinder pile of power house and flat coal waste rock pile,not only the misuse of arable land,and destruction of the landscape, but also seriously pollutes the surrounding environment.In order to address Heavy metals and restore damaged land resources,the need to phytoremediation the mine areas wasteland.In this paper,I choose the different types of Jixi mine areas wasteland for the study,for phytoremediation,through years in the field of physical planning,experiment and chemical analysis,the following conclusions:(1) The content of waste slag of Cd,Zn,Ni,such as Hg exceeded the standard in graphite gangue,the comprehensive indicators of gangue is 17.85;The content of waste slag of Hg exceeded the standard in the cinder pile of power house,it's comprehensive indicators is 5.25;The content of waste slag of Hg exceeded the standard in flat coal waste rock pile,it's comprehensive indicators is 1.67.And the comprehensive indicators that graphite gangue and the cinder pile of power house both reached the heavy degree of pollution,Hg was mainly due to the serious exceeded the standard。After burning the flat coal waste rock pile of the heavy metals pollution levels for light pollution。The forest soil comprehensive pollution indicators of mine areas wasteland is 0.92,the pollution level is still clean,but the content of Ni all exceed B standard,to the light pollution levels.(2) After Phytoremediation,the majority of the content of heavy metals are less than the original residues of mine areas wasteland and the by residue of natural recovery,it shows that the heavy metals pollution of there wastelands were clearly ameliorated by phytoremediation. Because of Cd,Zn,Ni and Hg exceeded the standard in graphite gangue,so we should mixed plant Lespedeza bicolor Turcz and Salix matsudana;in the cinder pile of power house,the best way is planting Hippophae rhamnoideso,applications should be promoted;in the flat coal waste rock pile,the best way is mixed planting Larix gmelini(Rupr.)Rupr and Hippophae rhamnoides sinensis,because they absorb heavy metals Hg which exceeded the standard best, we can try to promote large-scale cultivation.(3) After Phytoremediation,the majority of the content of soil nutrient are less than the original residues of mine areas wasteland and the by residue of natural recovery,it shows that the soil nutrient of there wastelands were clearly ameliorated by phytoremediation.Except the content of Phosphor,other soil nutrient is far blew that of the forest,the best effect is the Salix matsudana,applications should be promoted;the Hippophae rhamnoideso can increase the content of the soil nutrient in the cinder pile of power house clearly;the content of the soil nutrient were rise fast by phytoremediation in flat coal waste rock pile and close to the forest, we should mixed cultivation Larix gmelini(Rupr.)Rupr.and Sanguisorba off cinalis L,is expected to achieve the desired effect.From the ecological point of view,in the three mine areas wasteland we should plant Pioneer species,the first covering the surface,to achieve its objectives,in penman's opinion, because of soil conditions improve,we should plant like Pinussylvestris L.var.mongolica Litv and Pinus densiflora,to accelerate the pace of succession。...