摘要
以开顶式塑料薄膜气室[Open—Top Chamber,OTC]为设施,运用LI—6400便携式光合测定系统,研究了2年生盆栽香樟(Cinnamomum camphora(L.)Presl.)叶片的净光合速率和生长量在高CO2摩尔分数下的响应。结果表明:在各自生长环境下,处理组OTC1[(1000±100)μmol.mol-1]、OTC2[(700±100)μmol.mol-1]的香樟净光合速率在整个处理期间均高于对照组CK[(400±50)μmol.mol-1]的,同时光补偿点降低,光饱和点提高。叶片净光合速率的日变化最大值分别出现在8:00和14:00左右,有明显的光合午休现象;CO2摩尔分数增高可以提高叶片的净光合速率和瞬时水分利用效率,使蒸腾速率和气孔导度下降。在生长量方面,处理组OTC1、OTC2的株高、单叶面积、基茎、株鲜质量、株干质量分别比对照组CK的有显著提高,有利于其生长。
An experiment was conducted to study the responses of photosynthetic characteristics and growth of two-year-old potted seedlings of Cinnamomum camphora（L.） Presl.to the elevated carbon dioxide concentration by the open-top chamber and LI-6400 Portable Photosynthesis System（LI-COR）.The carbon dioxide levels were（1000±100）μmol·mol-1 for treatment 1,（700±100）μmol·mol-1 for treatment 2 and（400±50）μmol·mol-1 for CK.Results showed that the photosynthetic rates（Pn） of the leaves of C.camphora seedlings in treatment 1 and treatment 2 were higher than that in the natural condition（CK） throughout the whole test period.The light compensation point decreased,while light saturation point increased.The Pn showed two peaks at 08：00 and 16：00 respectively,with an obvious midday depression phenomenon.Pn and instantaneous water use efficiency increased and transpiration rate and stomatal conductance significantly decreased with the elevated CO2 concentration.Moreover,the elevated CO2 concentration also had an important influence on the growth of the seedlings.The increase in height,leaf area,stem base,fresh weight and dry weight of C.camphora seedlings in treatment 1 and treatment 2 was more obvious than that in the CK,which was favorable to their growth.
出处
《东北林业大学学报》
CAS
CSCD
北大核心
2011年第5期27-29,43,共3页
Journal of Northeast Forestry University
基金
国家"十一五"科技支撑计划项目(2006BAJ02A02
2006BAD2007B09)
景观绿化碳汇系统构建研究与应用研究(10DZ120030A)资助
关键词
香樟
CO2摩尔分数
光合速率
生长量
Cinnamomum camphora
CO2 concentrations
Photosynthetic rates
Growth
