大气CO_2浓度和温度升高对水稻体内微量元素累积的影响  

Influence of elevated atmospheric CO_2 and temperature on microelement accumulation in rice

作　　者：李春华[1,2] 曾青[1] 沙霖楠 张继双[1,2] 朱建国[1] 刘钢[1] 

机构地区：[1]中国科学院南京土壤研究所土壤与可持续农业国家重点实验室,南京210008 [2]中国科学院大学,北京100080 [3]南京林业大学生物与环境学院,南京210037

出　　处：《农业环境科学学报》2017年第6期1021-1026,共6页Journal of Agro-Environment Science

基　　金：国家自然科学基金面上项目(41271310;31261140364);中国科学院知识创新方向项目(KZCX2-EW-414)~~

摘　　要：为明确水稻体内微量元素对未来气候变化的响应,应用T-FACE(Temperature and CO_2Free Air Controlled Enrichment)试验平台,以常规粳稻武运粳23为试材,研究大气CO_2浓度升高(对照+200μL·L^(-1))和增温(对照+1℃)对收获期水稻体内微量元素累积的影响。结果显示,高浓度CO_2促进了稻穗中微量元素的累积,2013年穗中Fe和2014年穗中Zn的累积量分别显著增加16.7%和30.8%;增温降低了水稻器官中元素的累积量,2013年穗中Fe以及叶中Mn和Zn的累积量显著下降,降幅分别为30.2%、40.2%和57.3%;CO_2+温度整体降低了营养器官中Fe、Mn和Zn的累积量,2013年叶中Zn累积量显著减少40.0%。另外,高浓度CO_2降低了籽粒中Fe的累积量,2013年Fe累积量显著下降47.5%,同时提高了Mn与Zn的累积量,2014年Zn累积量显著增加43.4%;增温明显降低了籽粒中Fe、Mn和Zn的累积量;CO_2+温度有降低籽粒中元素累积量的趋势,其中2013年降幅大于2014年。以上结果表明未来CO_2浓度升高可在一定程度上缓解增温导致的水稻体内微量元素累积下降的状况。To investigate the influence of elevated CO2 concentration（[CO2]）（＋200 μL·L-1）and elevated temperature（＋1 ℃）on microelement accumulation in rice（Oryza Sativa L.）in future climate conditions, a field experiment was carried out on the Temperature and Free Air CO2Enrichment（T-FACE）platform. The results showed that elevated [CO2] enhanced the accumulation of microelements in the panicle,with significant increases in Fe accumulation in 2013（16.7%）and Zn accumulation in 2014（30.8%）. Rising temperature significantly reduced the accumulation of Fe in the panicle and the accumulation of Mn and Zn in the leaf. The decreases were 30.2%, 40.2%, and 57.3%, respectively. There was a declining trend of accumulation of these microelements in vegetative organs under the elevated [CO2] and temperature combination. Specially, the Zn accumulation in the leaf decreased significantly, by 40.0%, in 2013. Additionally, elevated [CO2] reduced the Fe accumulation but increased the Mn and Zn accumulation in the grain. In particular, a significant reduction of 47.5% of Fe in 2013 and increase of 43.4% of Zn in 2014 were observed. Meanwhile, elevated temperature decreased the accumulation of Fe, Mn, and Zn in rice grain in both years. Declining trends for microelement accumulation in rice grain under the combination of elevated [CO2] and temperature were detected both in 2013 and 2014, but the degrees of reduction in 2013 were greater than those in 2014. All these results demonstrated that CO2 enrichment could, to some extent, alleviate the effects of rising temperature on microelement accumulation in the future.

关 键 词：CO2浓度升高 增温 水稻 微量元素 累积 

分 类 号：X511[环境科学与工程—环境工程]