引种红树与中国乡土红树幼苗光合特性研究  

Photosynthetic Characteristics of Introduced and Indigenous Mangrove Seedlings in China

作　　者：韩淑梅[1,2] 李妮亚[3] 何平[1,4] 钟才荣[5] 杨焰[3] 

机构地区：[1]北京林业大学林学院,北京100083 [2]海南大学农学院,海口570228 [3]海南师范大学生命科学学院,海口571158 [4]中国国际工程咨询公司农林水业务部,北京100044 [5]海南东寨港国家级自然保护区管理局,海口571129

出　　处：《西北植物学报》2010年第8期1667-1674,共8页Acta Botanica Boreali-Occidentalia Sinica

基　　金：海南省自然科学基金资助项目(30705);海南省自然科学基金资助项目(310104);海南省教育厅高等学校科研资助项目(Hjkj2008-08)

摘　　要：用Li-COR6400便携式光合作用测定系统对海南东寨港自然保护区人工育苗的中国乡土红树——海桑、引种红树——无瓣海桑和拉关木幼苗光合特性进行比较研究.结果显示：（1）无瓣海桑和拉关木叶片净光合速率日变化呈双峰曲线,最高峰出现在12：00,次高峰出现在15：00,而海桑呈现单峰曲线,峰值出现在12：00左右;无瓣海桑和拉关木叶片净光合速率的峰值均高于海桑.（2）3种红树叶片净光合速率和蒸腾速率的峰值均在同一时间（12：00）出现;胞间CO2浓度不随气孔导度的降低而减小,控制红树幼苗光合速率因子为非气孔限制;拉关木叶片水分利用效率要低于无瓣海桑和海桑.（3）与海桑幼苗相比,引种的无瓣海桑和拉关木幼苗的光补偿点和光饱和点均较低,而其表观量子效率较高,其光饱和净光合速率（Pmax）较大,且其CO2补偿点较低,CO2利用率较高,强光下的光合能力高.研究表明,无瓣海桑比海桑和拉关木具有更好的低光适应能力;拉关木有着较高的光合同化能力,其幼苗对生境的适应能力高于海桑属植物.The photosynthetic characteristics of Sonneratia caseolaris（L.） Engler,Sonneratia apetala Buch.-Ham.,Laguncularia racemosa in Dongzhai Harbor Mangrove Nature Reserve were investigated using Li-COR 6400 portable photosynthesis system.The results showed that the diurnal net photosynthetic rate（Pn） of S.caseolaris have one-peaked curves,the peaks occurred at 12：00,but the introduced S.apetala and L.racemosa in sunny day varied with double peak curves,the peaks occurred at 12：00 and 15：00;S.apetala and L.racemosa maintained higher photosynthetic rate than the indigenous S.caseolaris.The peak values of Pn and transpiration rate（Tr） appeared at the same time at 12：00.Intercellular CO2 concentration（Ci） did not decrease with the dropping of stomatal conductance and the mainly controlling factor of photosynthetic rate was non-stomatal limitation.The two Sonneratia species showed significantly overlap in water use efficiency（WUE）.Photosynthetic parameters derived from leaf photosynthetic light response curves and Pn-CO2 curves suggested lower carbon assimilation capacities for the indigenous S.caseolaris than for the introduced S.apetala and L.racemosa in the seedling.The photosynthetic ability of two introduced mangrove species were the highest because of the highest AQY,as well as the lowest CO2 compensation point（CCP）.The CO2 utilization rate of S.apetala and L.racemosa was higher.The lower light compensation point（LCP） of S.apetala indicated a better adaptation to a low light regime.The results also indicated that the photosynthesis of L.racemosa was inhibited insignificantly in their new habitats.

关 键 词：红树林 海桑属 拉关木 气体交换参数 光合特征参数 

分 类 号：Q945.79[生物学—植物学]