摘要
为了研究水分调控对材料钝化土壤重金属效果的影响,进行室内土壤培养试验。结果表明:添加复合钝化材料DLS可以显著提高土壤pH值,并降低土壤有效态Cu、Cd浓度;不同土壤含水率对土壤Cd钝化效应的影响不明显,但可显著影响土壤pH值和土壤有效Cu浓度;室内培养6天后,含水率为最大田间持水量40%处理的pH最高,20%处理最低,而对土壤有效态Cu的影响的结果相反,表现为最大田间持水量40%处理<80%<60%<100%<20%。结合旱地适宜的作物生长含水量范围一般为40%~60%,故在进行重金属污染田间修复实践过程中,推荐土壤湿度为最大田间持水量的40%~60%为宜。
An indoor soil culture experiment was conducted to study the effect of water regulation on thepassivation of heavy metals. The results showed that： soil pH could be significantly improved and the content ofavailable Cu and Cd in soil could be significantly reduced after adding the passivation material DLS; thebioavailability of Cd was not obviously influenced by the soil moisture content, but the soil pH and thebioavailability of Cu could be significantly affected by the soil moisture content; after the indoor cultureexperiment was conducted for 6 days, the highest pH appeared with the treatment of soil moisture contentbeing 40% of the maximum field water holding capacity, and the treatment of 20% was the minimum, however,the bioavailability of Cu was contrary to the soil pH, the bioavailability of Cu was shown as the treatment of soil moisture content was 40% 〈80% 〈60% 〈100% 〈20%. In the course of field planting, the suitable soilmoisture content range for plant growth was generally 40%-60%, therefore, in the process of field remediationof heavy metal contaminated soil, the soil moisture content should be kept in 40%-60% of the maximum fieldwater holding capacity, in order to achieve the best passivation effect of the alkaline passivation material.
出处
《中国农学通报》
2017年第35期88-93,共6页
Chinese Agricultural Science Bulletin
基金
国家“973计划”课题(2013CB934302)
赣鄱英才555工程
国家科技支撑计划课题(2015BAD05B01)
国家自然科学基金重点项目“典型区域大气氮沉降对土壤镉活化及作物镉累积的影响研究”(41571461)
关键词
土壤
重金属
钝化
水分调控
soil
heavy metal
passivation
water regulation
