近地层大气臭氧浓度升高对麦季土壤Zn生物有效性的影响  

Influence of elevated tropospheric ozone on the bioavailability of zinc in wheat-planted soil

作　　者：魏思雨[1] 王亚波[1] 邵阳[1] 韩书文[1] 杨婷婷[1] 尹微琴[1] 王小治[1] 

机构地区：[1]扬州大学环境科学与工程学院,江苏扬州225127

出　　处：《江苏农业学报》2016年第4期791-797,共7页Jiangsu Journal of Agricultural Sciences

基　　金：国家自然科学基金项目(41371294)

摘　　要：为明确大气O3浓度升高对麦季各生育期不同土层中Zn生物有效性的影响,利用开顶式气室（OTCs）设置正常大气和臭氧浓度升高（比周围大气高40 nmol/mol）处理,土壤设置外源加入0 mg/kg、200 mg/kg、400mg/kg Zn处理,在小麦苗期、分蘖期、拔节期、抽穗期和成熟期分别采集耕层0-50 cm、51-100 cm、101-150cm各土层土样,同时利用BCR连续提取法和DTPA提取法评价盆栽小麦土壤Zn生物有效性。结果表明,大气臭氧浓度升高对整个耕层土壤（0-150 cm）Zn的有效性影响不显著;在成熟期显著增加了无外源Zn污染土壤0-50 cm和101-150 cm土层中Zn的有效性,其DTPA提取态Zn增幅分别为150%和241%,但在51-100 cm土层中DTPA提取态Zn显著降低424%;在小麦生育早期显著增大了外源加入400 mg/kg Zn污染土壤0-50 cm和101-150 cm土壤Zn的有效性。BCR连续提取法与DTPA浸提法在衡量有效态Zn变化趋势上有相似的规律,但BCR连续提取法测定的有效态Zn数值大于DTPA浸提法,且土壤Zn含量低时差异显著。The objective of this study was to clarify the changes of the bioavailability of zinc in the soil affected by atmospheric elevated ozone( O_3) during wheat season. Open top chamber( OTCs) were used to set up normal atmospheric conditions and elevated atmospheric O_3( 40 nmol/mol higher). Three levels of exogenous zinc were applied( 0 mg/kg,200 mg / kg,and 400 mg / kg) soil samples collected at 0-5 cm,5. 1-10. 0 cm and 10. 1-15. 0 cm depth of topsoil at seedling,tillering,jointing,heading,and maturity respectively. The bioavailability of soil Zn was evaluated by the Community Bureau of Reference( BCR) sequential extraction and the DTPA extraction method. The elevated O_3 level had no significant influence on the bioavailability of soil zinc in the topsoil. The zinc availabilities in non-polluted soil at 0-5. 0 cm and 10. 1-15. 0 cm depths were increased at maturity by elevated O_3 level,with the increments of 150. 0% and 241. 0% using DTPA method,while in the soil at 5. 1-10. 0 cm the zince availability was decreased by 42. 4%. Exogenous zinc at the application rate of400 mg / kg boosted the soil zinc availabilities at 0-5. 0 cm and 10. 1-15. 0 cm depths. BCR method outperformed DTPA in describing the change of available zinc at low initial zinc concentration.

关 键 词：开顶式气室 臭氧浓度升高 锌 麦季 生物有效性 

分 类 号：X171.3[环境科学与工程—环境科学]