摘要
以神农架林区木鱼镇茶山上生长的8种不同类型植物为试验材料,于晴天选择其植株上东南朝向的顶部成长叶,采用LI-COR6400便携式光合测定系统、调制叶绿素荧光成像系统(IMAGING-PAM M-Series)及双通道PAM-100测量系统(Dual-PAM-100)和常规方法研究了其叶片特征、光合性能及相互间的关系,将有助于了解神农架植物的光合生产力及其植被管理。结果表明,不同类型植物叶片的叶片特征和光合性能存在明显的物种差异。比叶重(SLW)为乔木>灌木>草本;气孔参数以气孔导度(Cond)差异最大;草本植物的光合能力明显高于灌木和乔木,而灌木和乔木间的差异不大;叶绿素含量(Chl)及其组分的差异较小,类胡萝卜素(Car)和花青素含量(Ant)及其与Chl的比值差异极大。不同类型植物叶片特征和光合性能指标的变异系数在7.3%～73.0%间,Chla/Chlb最小,Car/Ant最大;Chla/Chlb、基于叶温的蒸汽压亏缺(VpdL)和胞间CO2浓度(Ci)小于15%,Cond、单位鲜重Car、PSII实际量子产量和PSI非光化学能量耗散的量子产量为40%～50%,单位干重Car、Ant、Chl/Ant和Car/Ant则大于60%,其他指标在20%～40%。相关分析显示,Pn受Cond、叶片含水量和单位干重Chl的正向调控,Ant和Car对Pn无决定性作用;PSII和PSI的实际量子产量依赖于Ci和Chl,Car过高导致其降低;PSI的光保护受SLW的负调控及单位鲜重Chl和单位干重Car的正调控;光合机构的光损伤受Ci的负调控和Chl/Car的正调控。
The top mature leaves facing southeast direction of eight plants in sunny day were used as the experimental materials including Camellia sinensis, Viburnum glomeratum Maxim, Rhus chinensis Mill, Herba Mosla, Castanea mollissima Blum, Lindera glauca Blume, Miscanthus floridulu Warb and Pueraria lobata Ohw grown in Tea Mountain of Muyu town, Shennongjia National Nature Reserve. Leaves characteristics and photosynthetic capacities of various plants were determined with LI-COR 6400 Portable Photosynthesis Measuring System, Modulated Chlorophyll Fluorescence System （IMAGING-PAM M-Series）, Dual-PAM-100 Measuring System and conventional methods and the their relationships were analyzed. The research results will contribute to realize plant photosynthetic productivity and vegetation management in Shennongjia National Nature Reserve. Leaves characteristics and photosynthetic capacities of various plants had the significant differences. The difference of stomatal conductance （Cond） was the largest among the stomatal characteristics of various plants; Photosynthetic capacity of herb was higher than those of tree and shrub, but the difference of later two was little; Specific leaf weight （SLW） was the order of tree 〉 Shrub 〉 herb. The differences of chloro- phyll content （Chl） and its component were lower, while the greater differences were in the carotenoid （Car）, anthocyanin （Ant） con- tents and the ratio of them to Chl. Coefficients of variation in determined indexes of various plants were 7.3%-73.0%, the minimum with the ratio ofChl a to Chl b （Chla/Chlb） and the maximum with the ratio of Car to Ant （Car/Ant）. Variations of the Chla/Chlb, leaf vapor pressure deficit （VpdL） and intercellular CO2 concentration （Ci） were lower than 15%, those of the Cond, Car content per fresh weight, actual quantum yield of PSII, quantum yield of non-photochemistry energy dissipation in PSI were 40%-50%, those of the Car per dry weight, Ant, Chl/Ant and Car/Ant were larger than 60%, those of others were 20%-40%. Correlation analysis indicated that the effects Ant and Car on Pn were no significant; Cond, leaf water content and Chl per dry weight could positively regulate Pn. Actual quantum yield of PSII and PSI mainly depended on Ci and Chl, and they would he decreased by excessive Car. Photo protection of PSI was negatively regulated by SLW and positively regulated by Chl per fresh weight and Car per dry weight; moreover, photo damage of photosynthetic apparatus were negatively regulated by Ci and positively regulated by Chl/Car.
出处
《生态环境学报》
CSCD
北大核心
2010年第1期165-171,共7页
Ecology and Environmental Sciences
基金
国家重点基础研究发展计划(973)项目(2009CB118504)
中国科学院知识创新工程重大项目(KSCX2-YW-N-059)
上海市博士后基金(07R214153)
关键词
神农架
不同类型植物
叶片特征
光合性能
Shennongjia National Nature Reserve
various plants
leaf characteristics
photosynthetic capacities
