田间大豆植株N_2O通量的测定及光照的影响  

Field measurement of N_2O flux from soybean plant and effect of light on it.

作　　者：于克伟[1] 黄斌[1] 陈冠雄[1] 吴杰[1] 

机构地区：[1]中国科学院沈阳应用生态研究所,沈阳110015

出　　处：《应用生态学报》1997年第2期171-176,共6页Chinese Journal of Applied Ecology

基　　金：国家攀登计划基金! (No.2 7);中国科学院陆地生态系统痕量物质生态过程开放实验室基金

摘　　要：采用封闭式箱法 ,在田间自然状况下对大豆植株N2 O通量进行了测定 .结果表明 ,在主要生育期内 ,大豆植株N2 O通量有 2个释放高峰 ,分别位于苗期和开花结荚期 .大豆植株N2 O通量的昼间变化模式基本上为上午有 1个释放高峰 ,而下午有一个释放低谷 .施肥和对照小区N2 O平均通量分别为 2 .2 7和 1 .2 8μgN2 Om- 2 ·h- 1 .在较强的光照条件下( 1 0 4 lx数量级 ) ,大豆植株N2 O通量较低 ,甚至可吸收大气中的N2 O ,而在较弱光照条件下( 1 0 3～ 1 0 2 lx数量级 ) ,大豆植株N2 O通量较高 .The N 2O flux from soybean plant measured by closed chamber method under field condition shows that there exist two peaks of N 2O emission at soybean′s seedling and flowering stages,respectively. The general pattern of diurnal variation in N 2O flux from soybean plant is an emission peak in the morning and a valley in the afternoon,which is not altered by fertilization.The average N 2O emission rates are 2.27 and 1.28 μgN 2Om -2 ·h -1 for fertilized and control plots,respectively. Soybean plant has a lower N 2O flux under strong light condition (in the level of 10 4 lx), even absorbing the atmospheric N 2O.But under weak light condition (in the level of 10 3～10 2 lx),N 2O flux from soybean plant is higher.

关 键 词：大豆 植株 光照 一氧化二氮通量 

分 类 号：S565.101[农业科学—作物学]