摘要
首次采用封闭罩法 ,对阳生树木 (水曲柳、红松和赤杨 )及阴生树木 (椴树 )的连体及离体枝叶在不同光强下的N2 O释放进行了野外原位观测 .结果表明 ,阳生树木与阴生树木的N2 O释放对光的反应不同 .阳生树木的N2 O释放受光强的调节规律同以往对农作物等的研究结果一致 ;而阴生树木椴树的N2 O释放速率在强光下N2 O释放较多 ,弱光下释放减少甚至吸收大气N2 O ,其N2 O释放速率与光强呈显著线性正相关关系 .
This paper firstly measured in situ N 2 O emission from branches and leaves of sun plants ( Fraxinus mandshurica,Pinus koraiensis,Alnus hirsuta ) and shade tolerant plants ( Tilia amurrensis ) under different light irradiances in closed chamber. Light irradiance had contrast effects on N 2 O emission flux from sun and shade tolerant tree species. In the test sun plants,more N 2 O was emitted under weak light than under strong light. The emission rates decreased with increasing irradiances,and even absorption instead of emission of N 2 O was detected under strong light. In contrast to sun plants,in the shade tolerant plant T.amurrensis ,there was more N 2 O emission under strong light than under weak light,and N 2 O absorption from environment was detected under weak light.
出处
《应用生态学报》
CAS
CSCD
2002年第12期1563-1565,共3页
Chinese Journal of Applied Ecology
基金
国家自然科学基金项目 (4 970 10 16
3 9770 0 66)
中国科学院百人计划资助项目
关键词
光强条件
阳生树木
阴生树木
N2O释放
Light irradiances, Sun plant, Shade tolerant plant, N 2 O emission.
