摘要
将玉米秸热解制备的生物炭施入铜、铅、镉复合污染土壤,通过土壤培养实验和小白菜盆栽实验,探究热解温度（400、700℃）和施加量（1％、2％、5％）对生物炭修复重金属污染土壤效果的影响.结果表明,施加400℃生物炭（BC400）和700℃生物炭（BC700）后土壤pH分别增加0.14～0.52和0.27～0.78.施加两种生物炭均可以使土壤重金属形态钝化,降低小白菜对重金属的吸收;而且生物炭施加量越大,效果越明显.对重金属生物有效性降低的改良效果顺序为BC700＞BC400.在生物炭施加量相同的情况下,BC400处理小白菜可食部干重大于BC700处理.同时,相对于施加量5％的BC700处理,施加5％的BC400能更明显地增加土壤微生物的生物量.
In this paper, two corn straw derived biochars prepared at 400℃ （BC400） and 700℃ （BC700） were added into soil co-contaminated by copper, lead, and cadmium to study the effectiveness of biochars incorporation on ameliorating co-contaminated soil by soil incubation experiment and pot experiment of pakchoi. The results showed that soil pH increased by 0.14-0.52 and 0.27-0.78 after BC400 and BC700 addition respectively. Both biochars had the ability to prompt the inactivation of heavy metals in soil, and reduce metals content of edible part and root of pakchoi. The effect of decreasing bioavailability of metals in soil enhanced as the application rate of biochar rose. The reducing bioavailability of metals by different biochar amendments was in the following order： BC700〉BC400. At a given bioehar content, compared with BC700, soil amended with BC400 resulted in elevated biomass dry weight of edible part of pakchoi. Meanwhile, compared with BC700, greater microbial biomass increase was observed with the BC400 application.
出处
《广东农业科学》
CAS
CSCD
北大核心
2014年第12期67-71,共5页
Guangdong Agricultural Sciences
基金
国家"十二五"科技支撑计划项目(2011BAD11B01
2011BAD11B02)
国家"948"重点项目(2011-G30)
江苏高校优势学科建设工程项目
