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当前位置: 首页 > 文章 > 开放式空气二氧化碳浓度增高(FACE)条件下水稻的根系活力和氮同化能力 应用生态学报 2005,16 (8) 1482-1486
Position: Home > Articles > Root activity and nitrogen assimilation of rice(Oryza sativa)under Free-Air CO_2 Enrichment Chinese Journal of Applied Ecology 2005,16 (8) 1482-1486

开放式空气二氧化碳浓度增高(FACE)条件下水稻的根系活力和氮同化能力

作  者：
庞静;朱建国;谢祖彬;刘钢;陈改苹;张雅丽
单  位：
中国科学院南京土壤研究所土壤与农业可持续发展国家重点实验室
关键词：
FACE;CO2浓度升高;水稻;根系伤流液;根系活力;氨基酸合成
摘  要：
利用FACE(FreeAirCarbon-dioxideEnrichment)平台技术,用伤流量法研究了低氮(LN150kg.hm-2)和常氮(NN250kg.hm-2)水平下,大气CO2浓度升高对水稻分蘖、抽穗期和穗后35d根系活力和根系N同化能力(氨基酸合成能力)的影响.结果表明,就整株水稻来看,CO2浓度升高和N处理对根系活力无显著影响;但由于FACE条件下水稻分蘖数增加14.5%(LN)和20.7%(NN),使每茎根系活力(伤流强度)降低1.4%~21.7%.在分蘖和抽穗期,虽然FACE处理促进了根系吸收的无机N向氨基酸转化,根系伤流液中氨基酸氮/无机氮提高11.1%~143.1%,但氨基酸浓度和合成总量和对照相比无明显差异.在穗后35d,FACE处理减弱了水稻根系的N同化能力,表现为根系伤流液中氨基酸/无机氮降低38.1%(LN)和29.2%(NN);同时氨基酸浓度降低34.0%(LN)和44.7%(NN),氨基酸合成总量降低50.8%(LN)和40.0%(NN).提高施氮水平促进了抽穗期水稻根系对无机氮的吸收,伤流液中无机氮含量增加51.1%(对照)和155.2%(FACE),但并未增加氨基酸合成量,由此导致抽穗期氨基酸氮/无机氮显著降低19.5%(对照)和36.8%(FACE);同时,氮处理在这个时期与FACE处理表现出明显的交互作用.
译  名：
Root activity and nitrogen assimilation of rice(Oryza sativa)under Free-Air CO_2 Enrichment
作  者：
PANG Jing~(1,2),ZHU Jianguo~1,XIE Zubin~1,LIU Gang~1,CHEN Gaiping~1,ZHANG Yali~1(()~1State Key Laboratory of Soil and Sustainable Agriculture,Institute of Soil Science,Chinese Academy of Sciences,Nanjing 210008,China;~2Faculty of Resource and Environment,Hubei University,Wuhan 430062,China)
关键词：
FACE, Elevated CO_2, Rice, Xylem exudates, Root activity, Amino acid synthesis
摘  要：
With Free-Air CO_2 Enrichment(FACE)technique,this paper studied the root activity and amino acid(aa) synthesis of rice(Oryza sativa)at low N(LN,150 kgNhm~(-2))and normal N(NN,250 kgNhm~(-2))under ambient air and elevated atmospheric CO_2(Ambient+200 μmolmol~(-1)).Under elevated CO_2,the xylem exudates per hill changed little,while the xylem exudates per stem declined by 1.4%21.7% as the result of greater tiller numbers.At tillering and heading stages,elevated CO_2 increased aa N/inorganic N in xylem exudates by 11.1%143.1%,but did not affect the aa concentration in xylem exudates and the total amount of aa in roots significantly.However,at 35 days after heading,the aa N/inorganic N ratio decreased by 38.1%(LN)and 29.2%(NN)under elevated CO_2.FACE also declined the aa concentration in xylem exudates by 34.0%(LN)and 44.7%(NN),and the total amount of aa by 50.8%(LN) and 40.0%(NN),which meant the retarded capability of aa synthesis in roots.N amendment led to a decrease of aa N/inorganic N in xylem exudates by 19.5%(Ambient) and 36.8%(FACE) at heading stage,as the result of unaffected aa and increased inorganic N concentration.There existed a significantly antagonistical CO_2N interaction on aa N/inorganic N at heading stage.

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