Dynamics of Reductive Organic Acid and the Relationship with Growth of Rice in Cold-waterlogged Paddy Soil
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摘要: 低产冷浸田在江南稻区分布广泛。在福建闽侯县单季稻生育期,比较分析冷浸田与同一微地貌单元内非冷浸田水稻根系土壤的还原性有机酸种类、浓度、动态及与水稻生长的关系。结果表明,冷浸田还原性有机酸主要以草酸为主,占有机酸总量的80%以上。垄口与垄中地形分别发育的冷浸田水稻各生育期有机酸均显著高于对应的非冷浸田。随着生育期的进程,有机酸与亚锰呈递增趋势,而亚铁呈递减趋势。还原性有机酸与水稻生物量及籽粒产量均呈显著负相关,回归方程表明,还原性有机酸对籽粒产量的障碍贡献要高于亚铁而低于亚锰。Abstract: Cold-waterlogged paddy field with low-yield are very common in south China.During growing period of the single-crop rice in Minhou County of Fujian,the kinds,concentrations and dynamics of reductive organic acids were analyzed in the soil around the rice roots grown in the cold-waterlogged paddy fields comparing to that of the non-cold soak fields within the same micro-geomorphic units,and the relationship between reductive organic and rice growth were also detected.The results showed that the organic reducing acids in the cold soak fields were mainly consist of oxalic acids,accounting for more than 80% of the total organic acids.Amount of organic acids in cold soak fields developed in different terrains significantly were higher than those in non-cold soak fields.As the rice growing,the amounts of organic acids and sodium manganese were correspondingly increasing,while ferrous decreasing.Significantly negative correlation between organic reducing acids and rice biomass and grain yield was found.Regression equations indicated that organic reducing acids showed higher inhibitive effect on the grain yield,compared to ferrous and manganite.
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Key words:
- cold-waterlogged paddy soil /
- reductive organic acids /
- ferrous /
- manganite /
- rice /
- yield
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