Effects of elevated ozone on growth and yield of field-grown rice in Yangtze
River Delta, China |
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Authors: | CHEN Zhan WANG Xiaoke FENG Zhaozhong ZHENG Feixiang DUAN Xiaonan and YANG Wenrui |
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Institution: | Research Center for Eco-gnvironmental Sciences,Chinese Academy of Sciences,Beijing 100085,China |
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Abstract: | 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. |
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Keywords: | ozone rice growth yield Yangtze Delta |
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