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拔节期水稻光合碳输入的动态变化及其对施氮的响应:13C-CO2脉冲标记
摘要点击 449  全文点击 132  投稿时间:2017-02-24  修订日期:2017-07-13
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中文关键词  水稻光合碳  拔节期  施氮  13C脉冲标记  根际  非根际
英文关键词  rice photosynthesized carbon  jointing stage  nitrogen application  13C pulse-labeling  rhizosphere  bulk
作者单位E-mail
陈珊 中南林业科技大学环境科学与工程学院, 长沙 410004
中国科学院亚热带农业生态研究所, 亚热带农业生态过程重点实验室, 长沙 410125 
869283723@qq.com 
祝贞科 中国科学院亚热带农业生态研究所, 亚热带农业生态过程重点实验室, 长沙 410125  
袁红朝 中国科学院亚热带农业生态研究所, 亚热带农业生态过程重点实验室, 长沙 410125  
王久荣 中国科学院亚热带农业生态研究所, 亚热带农业生态过程重点实验室, 长沙 410125  
彭佩钦 中南林业科技大学环境科学与工程学院, 长沙 410004 pqpeng123@sina.com 
葛体达 中国科学院亚热带农业生态研究所, 亚热带农业生态过程重点实验室, 长沙 410125  
吴金水 中国科学院亚热带农业生态研究所, 亚热带农业生态过程重点实验室, 长沙 410125  
中文摘要
      水稻光合碳是稻田土壤有机碳的重要来源之一,其在土壤中输入与分配特征受水稻生长状况和土壤肥力的影响.施肥是影响水稻生长的关键因素,为了探讨施氮对水稻拔节期光合碳的传输动态的影响,应用稳定同位素13C-CO2脉冲标记技术,通过盆栽试验,研究光合碳在水稻-(根际/非根际)土壤系统中输入与分配的动态变化及其对施氮的响应.结果表明,施氮显著增加了水稻地上部和根系生物量,降低了水稻根冠比.随着水稻的生长,水稻植株的13C丰度逐渐下降,根际土和非根际土中13C丰度先减少再增加;施氮显著增加了根际土壤中13C丰度,较不施氮相比增加了9.5%~32.6%.施氮使水稻地上部和根系中光合13C含量显著增加,较不施氮处理分别增加了24.5%~134.7%和9.1%~106%.脉冲标记一次性输入的光合13C主要分配在水稻植株体内,不施氮和施氮条件下的分配率分别为85.5%~93.2%和91.3%~95.7%;施氮显著影响光合碳在水稻地上部、根际土和非根际土中的分配特征(P<0.01),标记后26 d,与不施氮处理相比,施氮使光合碳在水稻地上部的分配增加了13.4%,在根际土和非根际土中的分配分别减少了21.9%和52.2%.因此,施氮增加了光合碳在土壤-水稻系统中的分配,但降低了光合碳在土壤中的累积.本研究进一步探讨了施氮条件下水稻拔节期光合碳的分配,为明确氮素对光合碳在水稻拔节期的动态变化以及对土壤有机碳库的影响,和深入了解农田土壤有机质累积提供理论依据和数据支持.
英文摘要
      Photosynthesized carbon (C) is an important source of soil organic C in paddy fields, and its input and distribution are affected by rice growth and soil fertility. Fertilizer application plays an important role in rice growth. The 13C pulse-labeling method was used to quantify the dynamics and distribution of input photosynthesized C in the rice-(rhizosphere-and bulk-) soil system and its response to nitrogen fertilizer (N) application. The results suggested that N fertilization significantly increased the rice aboveground and the root biomass and decreased the rice biomass root/shoot ratio. The amount of assimilated 13C gradually decreased in the rice plants but gradually decreased over 0-6 days and increased over 6-26 days in the rhizosphere and bulk soil during rice growth. N fertilization significantly increased the amount of assimilated 13C in the rhizosphere soil by 9.5%-32.6% compared with the control. In comparison to the unfertilized treatment, the application of N fertilization resulted in higher photosynthetic13C in rice aboveground and in the root by 24.5%-134.7% and 9.1%-106%, respectively. With the N fertilized and unfertilized treatments, 85.5%-93.2% and 91.3%-95.7%, respectively, of input photosynthetic 13C was distributed in the rice plants. The results suggested that N fertilization significantly affected the distribution of photosynthesized C in the rice-soil system (P<0.01). After 26 days of pulse labeling, the distribution of photosynthetic 13C into rice aboveground was increased by 13.4%, while the distribution into the rhizosphere and bulk soil were decreased by 21.9% and 52.2%, respectively, in the N fertilized treatments compared with the unfertilized treatments. Therefore, the N application increased the distribution of photosynthesized carbon in the soil-rice system but decreased the accumulation in the rhizosphere and bulk soil. The findings of this study provided a theoretical basis for our understanding of the dynamic of photosynthetic C in the plant-soil system and the assimilation of the soil organic matter pool in the paddy soil ecosystem.

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