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不同粒径羟基磷灰石对污染土壤铜镉磷有效性和酶活性的影响
崔红标,何静,吴求刚,巨星艳,范玉超,仓龙,周静,等
作者单位E-mail
崔红标 安徽理工大学地球与环境学院 cuihongbiao0554@163.com 
何静 安徽理工大学地球与环境学院  
吴求刚 安徽理工大学地球与环境学院  
巨星艳 安徽理工大学地球与环境学院  
范玉超 安徽理工大学地球与环境学院  
仓龙 中国科学院南京土壤研究所,江苏 南京  
周静 中国科学院南京土壤研究所,江苏 南京  
摘要:
为研究不同粒径羟基磷灰石对重金属污染土壤的修复效果,采用向污染土壤添加常规磷灰石(150 μm)、微米(3 μm)和纳米(40 nm)羟基磷灰石的田间原位实验方法,考察其钝化修复5年后对土壤铜镉磷有效性和酶活性的影响。结果表明:三种粒径羟基磷灰石均提高了土壤pH,降低了土壤交换性酸和交换性铝的含量,且微米羟基磷灰石处理效果最好。常规磷灰石、微米和纳米羟基磷灰石处理分别使离子交换态铜的含量降低了62.6%、74.3%和70.4%;离子交换态镉含量降低15.7%、25.3%和26.7%。三种材料均增加了土壤总磷含量,其中4.61%~17.4%和73.4%~89.8%分别转化为树脂磷和稳定态磷。微米羟基磷灰石处理分别使土壤脲酶活性和微生物量碳含量提高了4.66和0.66倍。研究显示,微米羟基磷灰石更有利于铜和镉由活性态向非活性态转化,增加土壤磷的有效性,提高土壤微生物活性,在我国南方重金属污染红壤区具有较好的应用潜力。
关键词:  羟基磷灰石  粒径        有效性  土壤酶活性
DOI:
分类号:X53
基金项目:安徽省高等学校自然科学研究项目 (KJ2016A191), 国家级大学生创新训练计划项目 (201510361006) 和安徽理工大学青年教师研究基金(QN201621)资助.
Effects of Availability of Cu, Cd and Phosphorus and Soil Enzyme Activities as Immobilization of Contaminated Soils Using Hydroxyapatite with Different Grain Sizes
cuihongbiao,et al
Abstract:
A in-situ field experiment was designed to study the effects of ordinary hydroxyapatite (HAP, 150 μm), micro-hydroxyapatite (MHAP, 3 μm) and nono-hydroxyapatite (NHAP, 40 nm) on the availability of copper (Cu), cadmium (Cd), and phosphorus (P) and soil enzyme activities. Results demonstrated that MHAP had the best efficiency in increasing soil pH and decreasing soil exchangeable acid and aluminum than the other amendments. The concentrations of exchangeable fraction of Cu were decreased by 62.6%, 74.3% and 70.4%, and by 15.7%, 25.3% and 26.7% for exchangeable fraction of Cu, respectively, in HAP, MHAP and NHAP treated soils. The three amendments all increased soil total P and 73.4~89.8% of them transported into stable-P, only 4.61~17.4% of them was changed into resin-P. Moreover, soil urease activities and microbial biomass carbon were 4.66 and 0.66 times of that in the control. The study showed that MHAP was more effective on transforming Cu and Cd from active to inactive fractions and increasing soil available P and soil microbial activity, which had good potential for the heavy metal-contaminated red soil in the southern of China.
Key words:  hydroxyapatite  grain size  Cu  Cd  phosphorus  availability  soil enzyme activity