应用生态学报2018，Vol.29Issue(2)：547-553,7.DOI:10.13287/j.1001-9332.201802.022
O3浓度升高对小麦根际土壤酶活性和有机酸含量的影响
Effects of elevated ozone concentrations on enzyme activities and organic acids content in wheat rhizospheric soil
摘要
Abstract
The elevated concentration of tropospheric ozone (O3) is an important global climate change driver,with adverse impacts on soil ecological environment and crop growth.In this study,a pot experiment was carried out in an open top chamber (OTC),to investigate the effects of elevated ozone concentration on soil enzyme activities (catalase,polyphenol oxidase,dehydrogenase and invertase),organic acids contents (oxalic acid,citric acid and malic acid) at different growth stages (tillering,jointing,heading and ripening stages) of wheat,and combined with the rhizospheric soil physicochemical properties and plant root characteristics to analyze the underlying reasons.The results showed that,elevated ozone concentration increased soil catalase,polyphenol oxidase,dehydrogenase and invertase activities at wheat ripening period to different degrees,with the effects on the activities of catalase and polyphenol oxidase being statistically significant.At the heading stage,activities of dehydrogenase and invertase were significantly increased by up to 76.7％.At the ripening stage,elevated ozone concentration significantly increased the content of citric acid and malic acid and redox potential (Eh) in rhizospheric soil,but reduced soil pH,electrical conductivity,total carbon and nitrogen.For root characteristics,elevated ozone concentrations significantly reduced the wheat root biomass,total root length and root surface area but increased the average root diameter.关键词
开顶式气室/臭氧浓度升高/根际土壤/酶活性/有机酸Key words
open top chamber/elevated ozone concentration/rhizospheric soil/enzyme activity/organic acid引用本文复制引用
尹微琴,景浩祺,王亚波,魏思雨,孙月,王圣森,王小治..O3浓度升高对小麦根际土壤酶活性和有机酸含量的影响[J].应用生态学报,2018,29(2):547-553,7.基金项目
本文由国家自然科学基金项目(41371294)资助 This work was supported by the National Natural Science Foundation of China (41371294). （41371294）
