生物炭对镉污染土壤中紫花地丁的生长及生理生态的影响

该文选用玉米秸秆生物炭,通过盆栽模拟在镉污染土壤中施加生物炭并栽培紫花地丁(Viola philip-pica),研究生物炭不同施加量对紫花地丁生长及生理生态的影响.研究结果表明:在室内培养45 d后,在未施加生物炭的镉污染土壤中,紫花地丁的株高、鲜质量和叶绿素含量等指标随镉在土壤中质量分数的增加而显著降低(P<0.0...

The Effects of Biochar on the Growth and Physiological Ecology of Viola philippica in Cadmium-Contaminated Soil

Corn stalks biochar is selected to simulate the application of biochar to the cadmium-contaminated soil and cultivate Viola philippica in pots to study the effects of different applications of biochar on the growth of V. philippica and the transformation of cadmium forms in soil.The results show that after 45 d of indoor cultivation,the plant height,fresh weight and chlorophyll content of V. philippica decrease significantly(P<0.05)with the increasing concentration of Cd in the soil without biochar application,while its antioxidant enzyme indicators such as Superoxide Dismutase(SOD),Catalase(CAT)and Peroxidase(POD)increase significantly(P<0.05).In the Cd-contaminated soil with biochar application,the fresh weight and plant height of V. philippica show a trend of first increasing and then decreasing with the increase of biochar application,fresh weight and plant height of V. philippica are significantly(P<0.05)higher than those of the control groups at 2% of biochar application in different concentrations of cadmium-contaminated soil.The chlorophyll a(C_a),chlorophyll b(C_b)and total chlorophyll(C_t)of V. philippica show first increasing and then decreasing with the increase of biochar application,and significantly(P<0.05)higher than those of the control groups at 2% or 4% of biochar application,while chlorophyll a/b(C_a/C_b)shows a trend of decreasing with the increase of biocharapplication.The activity of superoxide dismutase(SOD)in the plants of V. philippica shows a trend of decreasing with the increase of biochar application and is lowest at 6% of biochar application,while the activity of catalase(CAT)and peroxidase(POD)shows a trend of first decreasing and then increasing with the increase of biochar application and significantly(P<0.05)lower than those of the control groups at 2% or 4% of biochar application.It is shown that the moderate amount of biochar can alleviate the inhibitory effects of cadmium pollution on the height,biomass,chlorophyll content and antioxidant enzyme activities of V. philippica.