In order to understand the effects of water or N fertilizer on rice yield,quality and its physiological mechanism,a japonica hybrid rice cultivar Yongyou 2640 was grown in field,and two irrigation regimes,namely conti...
详细信息
In order to understand the effects of water or N fertilizer on rice yield,quality and its physiological mechanism,a japonica hybrid rice cultivar Yongyou 2640 was grown in field,and two irrigation regimes,namely continuously flooded(CF)and alternate wetting and moderate drying irrigation(AWMD),and three N rates,namely LN(120 kg N/ha),MN(240 kg N/ha),HN(360 kg N/ha)were *** effect of irrigation regimes and N rates on rice growth and development,yield formation,nutrient uptake,and rice quality were *** results showed that,at the same N rate and compared with CF,AWMD significantly increased grain yield by 6.7%-1 8.6%because of increases in the percentage of filled grains and 1000-grain *** the CF regime,the grain yield at HN and MN were 21.1%-23%and 12%-15.5%higher than LN,*** yield at HN was lower than MN due to the lower percentage of filled grains and lower 1000-grain *** the AWMD regime,grain yield showed no significance between MN and HN although both MN and HN exhibited a higher grain yield than that LN,with the increase by 23.7%-25.3%and 23.2%-24.4%,respectively.
大气二氧化碳(CO_2)浓度和气温增高是全球气候变化的重要特征,本研究旨在揭示未来气候变化条件下生长的水稻,其种子活力是否受这两个重要环境因子的影响。利用稻田FACE(Free Air CO_2Enrichment)系统,以常规水稻武运粳23为供试材料,设...
详细信息
大气二氧化碳(CO_2)浓度和气温增高是全球气候变化的重要特征,本研究旨在揭示未来气候变化条件下生长的水稻,其种子活力是否受这两个重要环境因子的影响。利用稻田FACE(Free Air CO_2Enrichment)系统,以常规水稻武运粳23为供试材料,设置对照(Ambient,环境空气)、CO_2浓度增高(比Ambient高200μmol/mol)、温度增高(比Ambient高2℃)和CO_2浓度与温度同时增高四个处理,成熟期收获种子进行实验室标准发芽实验。结果表明,与对照相比,单独CO_2浓度增加使成熟种子浸种24h浸出液电导率平均增加16.5%,但使种子露白率、发芽率、发芽势和发芽指数分别下降7.8%、10.0%、17.4%和8.9%。相似地,单独温度增高或CO_2浓度和温度同时增高处理对上述参数影响的方向一致,但影响的幅度变小,多未达显著水平。与环境生长温度相比,高温环境下全生育期CO_2浓度升高使成熟种子浸种24h浸出液电导率、露白率、发芽率、发芽势和发芽指数的影响变小,表现在CO_2浓度与温度处理间存在一定程度的交互作用。种子发芽后芽和根系性状对高CO_2浓度或高温均无显著响应。以上结果说明,大气CO_2浓度增高200μmol/mol环境条件下,常规粳稻武运粳23成熟种子露白率、发芽率、发芽势和发芽指数等指标均明显下降,但在同时适度增温的生长环境下这种负面影响有减弱的趋势。
暂无评论