Effect of Light Quality and Intensity on N_2O and NO_X(NO, NO_2)Emissions from Rice Phyllosphere and Roots at Tillering Stage in a Liquid Culture Medium System  

光照对分蘖期水稻叶际及根系-培养液体系N_2O和NO_X(NO,NO_2)排放的影响(英文)

作　　者：徐胜光[1] 李冰[2] 刘佳妮[1] 陈泽斌[1] 余磊[1] 赵凤[1] 耿开友[1] 王定康[1] 

机构地区：[1]昆明学院/云南省都市特色农业工程技术研究中心,云南昆明650214 [2]中科院昆明动物研究所,云南昆明650214

出　　处：《Agricultural Science & Technology》2016年第3期633-641,共9页农业科学与技术（英文版）

基　　金：Supported by National Natural Science Foundation of China(31160412;41361056);General Program of Basic Research of Yunnan Province(2011FZ183);Talent Introduction Project of Kunming University(YJL12012)~~

摘　　要：[Objective] N2Oand NOX（NO, NO2） are important nitrogen oxides gases（NOGs） in paddy fields, and rice plants play important roles in NOG emissions in paddy fields. However, the source of NOG emissions from rice phyllosphere and roots and their relationship to light quality and intensity still remain unclear. In this study, the relationship between light quality, intensity and N2 O, NOX（NO, NO2） emissions from rice phyllosphere and roots at tillering stage was investigated to clarify the contribution of rice plants to N2Oand NOX（NO, NO2） emissions and analyze the mechanism of light control, aiming at providing a scientific basis for revealing how light-control technology affects NOG emissions from rice at tillering stage in paddy fields. [Method] In this study, nitrogen content was controlled by a hydroponic system. A small electric incubator was used for light control. A simultaneous determination was designed to investigate the effect of different weak light qualities（yellow, green, white, red and blue lights） and intensities（dark, 0 lx; very weak, 2 000lx; weak, 4 000 lx; moderate, 6 000 lx; strong, 8 000 lx） on N2Oand NOXemissions from rice phyllosphere and roots at tillering stage in a liquid culture medium system. N2Oconcentration in air samples was determined by gas chromatography within 12 h, and NOX（NO, NO2） concentration was analyzed using 42 i NO- NO2-NOXgas analyzer. [Result] The results showed that：（1） Under a constant nitrogen condition（NH4NO3-N, 90 mg/L） when rice seedlings were treated with moderate（6 000lx） and strong（8 000 lx） light, the average emission rate of N2Oand NO from rice phyllosphere at tillering stage was 27.08, 32.33 μg/（pot·h） and 0.114, 0.057 μg/（pot·h）,respectively, accounting for 57.38%, 58.65% and 9.65%, 4.52% of the total release of N2Oand NO from the whole rice plant, respectively. It implicated that rice phyllosphere is an important source of N2Oemission at tillering stage in paddy fields.（2）When rice seedlings were [目的]该研究探讨光照对分蘖期水稻根、叶界面N_2O和NO_X排放的作用及其机制。[方法]试验在水培控氮、小型光控培养箱控光和同步测定条件下,探讨了不同光质、光强及光控处理对分蘖期水稻叶际及根系-培养液体系N_2O和NO_X排放的影响。[结果](1)在相同氮源(NH4NO3-N,90 mg/L)、日间光照为6 000、8 000lx条件下,分蘖期平均水稻叶际N_2O和NO排放速率分别为27.08、32.33μg/(pot·h)和0.114、0.057μg/(pot·h),分别占N_2O和NO总排放的57.38%、58.65%和9.65%、4.52%,水稻叶际是N_2O的重要排放源;(2)在光强(1 600 lx)一致条件下,LED黄、绿、白、红、蓝光处理的平均水稻叶际N_2O排放速率分别为6.83、9.40、9.73、2.82和4.08μg/(pot·h),光X强较高的红(3 000 lx)、蓝光(2 500 lx)处理能同步抑制分蘖期水稻根、叶界面N_2O的挥发(P<0.01),LED红、白光有促进日间水稻叶际NO排放的作用,LED蓝光则有同步抑制水稻根、叶界面NO挥发的作用效果,但不同光控处理下水稻根、叶界面均无明显的NO2净排放作用;(3)0～8 000 lx范围内随着光照增强,水稻根部NO及根、叶界面N_2O排放同步增加,但高光强(6 000～8 000 lx)下水稻叶际NO排放显著大幅下降(P<0.01)。[结论]水稻根、叶界面均以N_2O挥发为主;试验供氮水平下适度控制日间光强并同步增加红光、蓝光比例的技术,能同步抑制水稻根、叶界面氮氧化物的排放。

关 键 词：ILLUMINATION RICE N2O NOX（NO NO2） Emission 

分 类 号：S511[农业科学—作物学]