The Response To Chemical Properties In Phenanthrene Simulated Soil By Adding Roots

Fine root has the function of water, nutrients and regarded as growth regulator.The release in the death of fine root decomposition process, can effectively improve the ecological environment of soil. Polycyclic aromatic hydrocarbons (PAHs) has strong "three letter" effect, causing harm to human health and ecological environment of soil. Phytoremediation of PAHs contaminated soil mainly using the plant stimulating effect, promote the rhizosphere zone of polycyclic aromatic hydrocarbon degrading microbial growth and reproduction, so as to promote the removal of polycyclic aromatic hydrocarbons in soil and plant stimuli including root exudates and fine root turnover in the decomposition of camp release of nutrients.The research of phenanthrene contaminated soil properties on the response of Koelreuteria paniculata root added, exploring the effect of plant root turnover and PAHs pollution of the soil, which will determine the effect of the bioavailability of contaminants in the soil environment, the study will provide a theoretical basis for the sustainable utilization of land resources and the phytoremediation of PAHs contaminated soil.1.The annual dynamic change of phenanthrene contaminated soil propertiesIn the 100mg·kg-1 of phenanthrene polluted level,the annual average of soil pH is Plant root, stem and leaf can absorb PHAs, and the plant root exudates has catalytic degradation, especially, the absorption of plant roots is the main way of removing some organic pollutants in soil.each sampling time (P<0.05), and with the extension of time, the trend has gradually increased. The annual average of soil organic matter content is higher than the control 39.79% and the difference is significant in each sampling time (P<0.05), and with the extension of time, generally show a downward trend after the first rise. The annual average of soil total N content is lower than the control 29.83%, except for the 180day, there are existing significant differences in 0-270days (P<0.05).The annual average of soil total P content is lower than the control 25.22%, and in the 0-360 days each time there are existing significant differences (P<0.05). The annual average of soil DOC content is higher than the control 24.82%, and in 60-270 days each time there are existing significant differences (P<0.05).In the 500mg·kg-1 of phenanthrene polluted levell, the annual average of soil pH is higher than the control 4.72%, and the different is significant in each sampling time (P<0.05), and with the extension of time, the trend has gradually increased. The annual average of soil organic matter content is higher than the control 47.43%, and the difference is significant in each sampling time (P<0.05), and with the extension of time, generally show a downward trend after the first rise. The annual average of soil total N content is lower than the control 30.44%, and in the 0-270days each time there are existing significant differences(P<0.05).The annual average of soil total P content is lower than the control 18.85%, and in Oday,15days,60days, there are existing significant differences (P<0.05).The annual average of soil DOC content is higher than the control 28.95% and in 30 days,60 days,270 days,360 days, there are existing significant differences (P<0.05).2.Fine root effects on physicochemical properties of phenanthrene contaminated soilIn the 100mg·kg-1 phenanthrene polluted level, the annual average of soil pH with adding root treatment is higher than no root treatment 0.28%,but each sampling time there is no significant difference (P>0.05).The annual average of soil organic matter content with adding root treatment is higher than no root treatment6.11%, and in 15 days,30 days,60 days,90 days, there are existing significant differences (P< 0.05). The annual average of soil total N content with adding root treatment is higher than no root treatment 11.75%, and in 30days,60days,90days, there are existing significant differences (P<0.05). The annual average of soil total P content with adding root treatment is higher than no root treatment 13.18%, and there was existing significant difference in 60 days (P<0.05). The annual average of soil DOC content with adding root treatment is higher than no root treatment 3.82%, but each sampling time there is no significant difference (P>0.05).In the 500mg·kg-1 of phenanthrene polluted level, the annual average of soil pH with adding root treatment is higher than no root treatment 0.17%, but each sampling time there is no significant difference (P>0.05). The annual average of soil organic matter content with adding root treatment is higher than no root treatment 9.39%,and in 30 days,60 days,90 days,there are existing significant differences (P<0.05). The annual average of soil N content with adding root treatment is higher than no root treatment12.12%, there are significant differences in 90 days,180days,270 days, there was significant difference (P<0.05). The annual average of soil total P content with adding root treatment is higher than no root treatment12.75%, and there was existing significant difference in 60days (P<0.05).The annual average of soil DOC content with adding root treatment is higher than no root treatment3.52%, but each sampling time there is no significant difference (P>0.05).3.The relationship between each factor of 3 and root treatmentThe correlation analysis showed that soil chemical properties between root conditions exist certain synergy.There were existed significantly relationship between the soil pH and organic matter, total N, total P (P<0.05). There were existed significantly relationship between soil organic matter and total N, total P (P<0.05), There were existed significantly relationship between n between total N and total P (P<0.05).Analysis of the effects of PAHs pollution and fine root on soil chemical properties showed that the chemical properties of PAHs pollution on Soil and fine roots were affected, and the effect of PAHs pollution on soil chemical properties of the larger. From the influence factors of the arrow point and its projection to extend the line can be seen, the fine root to add a greater impact on soil soluble organic carbon.In general, Fine root decomposition and PAHs pollution impact on soil chemical properties, especially the PAHs pollution. The PAHs pollution of soil pH, organic matter, the content of DOC was higher than that of the control, total N, total P content was lower than that of the control. Adding root treatment of soil pH, organic matter, total N, total P, DOC content were higher than that in non root treatment.