农业环境科学学报2016，Vol.35Issue(10)：1857-1866,10.DOI:10.11654/jaes.2016-0594
亚热带地区水稻（Oryza sativa L.）气孔臭氧通量和产量的响应关系
Stomatal ozone flux-response relationships of rice(Oryza sativa L.)in subtropical area
摘要
Abstract
Based on previous investigations on a fully open-air ozone(O3)fumigation experiment(O3-FACE), we established dose-response relationships using O3 dose index AOT40(accumulated [O3] above 40 nL·L-1)and PODY(phytotoxic O3 dose, accumulated stomatal flux of O3 above a threshold of Y nmol·m-2·s-1), and compared their performance on O3-induced rice yield loss evaluation. The aim of this study is to find the optimum threshold for exposure-based and flux-based dose-response relationships used for ozone risk assessment on rice. Our result showed that the R2-value of regression analysis increased with flux threshold Y[0~11 nmol O3·m-2 PLA·s-1(PLA:projected leaf area)] and exposure threshold X(0~50 nL·L-1)increase, respectively. When flux threshold Y was 11 nmol O3·m-2 PLA·s-1 and exposure threshold X was 50 nL·L-1, the O3 dose index POD11 and AOT50 had the strongest correlation with RY(relative yield)of rice, respectively. High R2-value was derived i.e. 0.70~0.75 and 0.70~0.745 when flux threshold Y was within the range of 8~13 nmol O3·m-2 PLA·s-1 and exposure threshold X was 46~58 nL·L-1, respectively. Previous studies have indicated that the rice yield loss caused by near-surface ozone pollution may range from 5%to 8%. These results were similar with our estimation on ambient[O3] treatment using POD9~10 and AOT40~45. The high-er R2-value 0.73~0.74 with POD9~10 compared to that of 0.64~0.69 with AOT40~45 indicated that flux-based assessment may have a supe-rior performance on O3-induced rice yield loss estimation. Further analysis found that when flux threshold Y=9 nmol O3·m-2 PLA·s-1, as-sessment of rice yield loss was more accurate, and the R2-value(0.73)was higher than that of POD6(0.57). Our results suggested that POD9 is suitable for evaluating rice yield loss due to O3 increase in subtropical area.关键词
气孔导度/水稻(Oryza sativa L.)/臭氧/通量响应关系Key words
stomatal conductance/rice(Oryza sativa L.)/ozone/flux-response relationship分类
农业科技引用本文复制引用
张继双,唐昊冶,刘钢,朱建国..亚热带地区水稻（Oryza sativa L.）气孔臭氧通量和产量的响应关系[J].农业环境科学学报,2016,35(10):1857-1866,10.基金项目
科技部国际科技合作与交流项目 （）
