十溴联苯醚与锌复合污染胁迫下土壤酶和呼吸强度的响应  

Effects of combined pollution of decabromodiphenyl ether and Zn^(2+) on soil enzyme and respiration

作　　者：付玲芳[1] 谢登科[1] 符安[1] 陈键准[1] 李英燕[1] 莫测辉[1] 秦华明[1] 

机构地区：[1]暨南大学环境学院广东省高校水土环境毒害性污染物防治与生物修复重点实验室,广州510632

出　　处：《生态学杂志》2015年第8期2260-2266,共7页Chinese Journal of Ecology

基　　金：国家自然科学基金委-广东联合基金项目(U0933002);中央高校基本科研业务费专项(21612103)资助

摘　　要：为了了解多溴联苯醚与重金属复合污染对土壤微生态的影响,采用室内模拟土培方法研究了十溴联苯醚(decabromodiphenyl ether,BDE-209)和锌(Zn SO4·7H2O)单一及复合污染处理对土壤过氧化氢酶和蔗糖酶活性及土壤呼吸强度的影响。结果表明:短期(1~7 d)处理条件下,土壤蔗糖酶和过氧化氢酶对BDE-209和Zn2+单一和复合污染均表现出较高的敏感性,但随着暴露时间的延长,酶活性有逐渐恢复至对照组水平的趋势;最高浓度100 mg·kg-1的BDE-209与最高浓度1000 mg·kg-1的Zn2+复合处理组,蔗糖酶和过氧化氢酶活性则始终处于受抑制状态;BDE-209和Zn2+复合污染处理对土壤过氧化氢酶活性的影响在暴露前期主要为拮抗作用,而后期以协同作用为主,对土壤蔗糖酶的影响在不同时期分别表现出加合作用、拮抗作用和协同作用;BDE-209与Zn2+复合处理对土壤呼吸的影响呈现"促进-抑制-促进-抑制"的规律,但无论是促进作用还是抑制作用,其强度随时间而减弱。An indoor simulation method was conducted to study the effects of decabromodiphenyl ether （BDE-209） and Zn2＋（ZnSO4 · 7H2O） on the activity of soil enzymes （catalase and sac- charase） and soil respiration during 93-day incubation. The results indicated that catalase and saccharase showed high sensitivities to single and combined pollution of BDE-209 and Zn2＋ in a short term （ 1-7 d）. With the extension of exposure time, the activities of catalase and saccha- rase showed a trend of gradual recovery even up to control levels. But the activities of catalase and saccharase in the treatment with the highest concentration of 100 mg · kg-1 BDE-209 com- bined with the highest concentration of 1000 mg · kg-1 Zn2＋ were always in inhibited states. The effects of combined pollution of BDE-209 and Zn2＋ on soil catalase activities were characterized by antagonism in the early exposure and dominated by synergy in the later exposure, and the effects on soil saccharase showed additive, antagonistic and synergistic interactions at different times. The effects of combined pollution of BDE-209 and Zn2＋ on soil respiration presented a pat- tern of ＂promotion-suppression-promotion-suppression＂, and the intensity of promotion or sup- pression decreased as the exposure time increased.

关 键 词：多溴联苯醚 锌 土壤酶 土壤呼吸强度 复合污染 

分 类 号：X53[环境科学与工程—环境工程]