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PHOTOSYNTHETIC RESPONSES OF PLANTS IN DIFFERENT SUBTROPICAL FORESTS ON INCREMENT OF ATMOSPHERIC CO2 CONCERTRATION
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- Author:
- No author available
- Journal Title:
- CHINESE JOURNAL OF APPLIED & ENVIRONMENTAL BIOLOGY
- Issue:
- 1
- DOI:
- 10.3321/j.issn:1006-687X.2000.01.001
- Key Word:
- 亚热带林地树种;光合速率参数;全球变化CO2浓度
Abstract： 以桃金娘、荷木及九节和罗伞分别代表生长在密林、中等疏密林和疏林植物.在较高空气CO2浓度下,随着光强增加,疏林的桃金娘光合速率(An/μmol m-2 s-1)与光强关系曲线的最初直线部分斜率为0.051,而中等疏密林的荷木和九节则分别为0.039和0.034,密林的罗伞则较低,仅为0.022.疏林桃金娘的不包括光呼吸的CO2补偿点为Γ*38.1 μL L-1,较荷木和九节分别约高8.8%和10.7%;较罗伞约高14.7%.除罗伞有较低光呼吸速率外,疏林的桃金娘和中等疏密林荷木及九节的光呼吸速率(Rd)相似.光合作用的Rup2饱和速率(Vcmax)80.2 μmol m-2 s-1,较荷木和九节分别高24.8%和22.9%,表明生长在疏林的桃金娘有较大羧化作用潜力.实际电子传递速率与Rup2再生有关,桃金娘的实际电子传递速率为102.7 μmol m-2 s-1,明显较荷木和九节高.罗伞有低的电子传导率,可能罗伞光合速率受Rup2再生的明显限制.桃金娘的光能转化效率δ为0.47 electrons/quantum.而中等疏密林的荷木和九节则为0.23和0.26 electrons/quantum.疏林植物生长快,光合产物库不受限制时,空气CO2浓度增高,有利于促进阳生阔叶树种的光合速率持续增高,促进其种群优势.图4 表1 参12
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