Effects of elevated ozone on growth and yield of field-grown rice in Yangtze River Delta,China

• 作 者: CHEN Zhan WANG Xiaoke FENG Zha
• 机 构: Research Center for Eco-gnvironmental Sciences
• 出 处: 环境科学学报（英文版）
• 发表日期: 2004年期
• 关键词: ozone rice growth yield Yangtze Delta
• 基金项目: 国家自然科学基金;国家重点基础研究发展计划(973计划);中国科学院基金;the University of illinois,Urbana-Champaign for her valuable suggestions and grammar improvement

With rapid industrialization and urbanization in the Yangtze Delta,China,the tropospheric ozone concentration has increased to levels that induce orop yield loss.Rice,a widely grown crop in China,was investigated in field-established,open-top chambers.Four treatments were used:charcoal-filtered air (CF),non-charcoal-filtered air (NF),and charcoal-filtered air with two levels of additional ozone (O3-1 and O3-2).The AOT40s (accumulated hourly mean ozone concentration above 40 ppbv) were 0,0.91,23.24,and 39.28 ppmv.h for treatraent of CF,NF,O3-1,and O3-2,respectively.The rice height and biomass were reduced in the elevated ozone concentration.Less organic matter partitioning to roots under the elevated ozone significantly decreased rice root activity.The yield loss was 14.3% and 20.2% under O3-1 and O3-2 exposure,respectively.This was largely caused by a reduction in grain weight per panicle.