生物炭对重金属镉污染土壤中玉米生长的影响

Effects of Biochar on Maize Growth in HeavyMetal Cadmium Polluted Soil

为了揭示原始生物炭和铁改性生物炭对重金属镉污染土壤中玉米生长的影响,本研究共设置5个处理,分别为:(1)CK组,土壤样品不添加任何改良剂;(2)3%OB组,土壤样品添加3%原始生物炭;(3)5%OB组,土壤样品添加5%原始生物炭;(4)3%IMB组,土壤样品添加3%铁改性生物炭;(5)5%IMB组,土壤样品添加5%铁改性生物炭。播种时间为2022年5月3日,定苗时间为2022年5月21日,收获时间为2022年9月6日。分别测定了各处理组玉米的农艺性状、土壤理化性质、土壤有效态镉和籽粒镉含量。结果显示,原始生物炭和铁改性生物炭均促进了镉污染土壤中的玉米生长,提高了镉污染土壤的pH值,升高了镉污染土壤的电导率,升高了镉污染土壤的有机质含量,降低了镉污染土壤的养分,降低了镉污染土壤有效态镉和籽粒镉含量。与原始生物炭相比,铁改性生物炭促进了镉污染土壤中的玉米生长,提高了土壤pH值,降低了土壤养分,降低了土壤有效态镉和籽粒镉含量。本研究表明,与原始生物炭相比,铁改性生物炭能有效促进镉污染土壤中玉米的生长,提高土壤pH值和养分,降低土壤有效态镉和籽粒镉含量。铁改性生物炭可能是更有利于促进镉污染土壤中玉米生长和土壤修复的改性剂。

In order to reveal the effects of original biochar and iron-modified biochar on the growth of maize(Zea mays L.)in heavy metal cadmium polluted soil,a total of 5 treatments were set up in this study,namely:(1)CK group,soil samples without any amendment;(2)3%OB group,soil samples added 3%original biochar;(3)5%OB group,soil samples were added with 5%original biochar;(4)3%IMB group,soil samples were added with 3%iron-modified biochar;(5)5%IMB group,soil samples were added with 5%iron-modified biochar.The sowing time was May 3,2022,the seedling setting time was May 21,2022,and the harvest time was September 6,2022.The agronomic traits,soil physical and chemical properties,soil available cadmium and grain cadmium content of each treatment group were measured.The results showed that both original biochar and iron-modified biochar promoted the growth of Zea mays L.in cadmium-contaminated soil,increased the pH value of cadmium-contaminated soil,increased the conductivity of cadmium-contaminated soil,increased the organic matter of cadmium-contaminated soil content,reduced the nutrients in cadmium-polluted soil,and reduced the content of available cadmium and grain cadmium in cadmium-polluted soil.Compared with the original biochar,the iron-modified biochar promoted the growth of Zea mays L.in the cadmium-contaminated soil,increased the soil pH value,decreased the soil nutrient,and decreased the soil available cadmium and grain cadmium content.This study showed that compared with original biochar,iron-modified biochar could effectively promote the growth of Zea mays L.in cadmium-contaminated soil,increase soil pH and nutrients,and reduce soil available cadmium and grain cadmium content.Iron-modified biochar may be a more favorable modifier for promoting Zea mays L.growth and soil remediation in cadmium-contaminated soils.