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摘要: 以杂交新美柳Salix matsudana alba幼苗为研究材料,采用LI?鄄6400便携式光合测定系统对其光合特性进行研究。结果表明:①自然生长季节,杂交新美柳叶片的净光合速率(Pn)日变化呈单峰曲线,最高峰出现在中午11 : 00,其最大净光合速率(Pmax)为20.8 molm-2s-1。②在控制二氧化碳摩尔分数和温度的条件下,光饱和点(PLS)为1 847.6 molm-2s-1,光补偿点(PLC)为58.1 molm-2s-1。杂交新美柳的光饱和点和光补偿点都较高,表明它是一种阳性植物。③在控制光照强度和温度的条件下,利用Farquhar模型对杂交新美柳叶片净光合速率-胞间二氧化碳摩尔分数的响应进行拟合,当胞间二氧化碳摩尔分数小于400 molmol-1时,可算得其最大羧化速率(Vcmax)为91.6 molm-2s-1,二氧化碳补偿点(Г *)为46.5 molmol-1,呼吸速率(Rd)为4.9 molm-2s-1;升高二氧化碳摩尔分数可使杂交新美柳的净光合速率增大,提高叶片对光能的利用率,其叶片二氧化碳饱和点(PCS)大约在1 000 molmol-1,同时可算得其最大电子传递速率(Jmax)为256.0 molm-2s-1;当二氧化碳过饱和(>1 000 molmol-1)时,可算得其磷酸丙糖利用速率(UTP)为19.7 molm-2s-1。图3表2参18
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关键词:
- 森林生物学 /
- 杂交新美柳 /
- 幼苗 /
- 光合特性 /
- Farquhar模型
Abstract: The LI-6400 portable photosynthesis measuring system was used to determine photosynthetic characteristics of leaves in one-year-old seedlings of Salix matsudana alba and then fitted to the Farquhar model. Results showed that (1) During the growing season,diurnal changes in leaf net photosynthetic rate (Pn) had a single-peak curve that appeared at 11 : 00 oclock with a maximum net photosynthetic rate (Pmax) of 20.8 molm-2s-1. (2) When CO2 concentration(350 molmol-1) and temperature(25 ℃) were controlled,the photosynthetic light saturation point (PLS) was 1 847.6 molm-2s-1,and the photosynthetic light compensation point (PLC) was 58.1 molm-2s-1 indicating a sun-tolerant plant. (3) The Farquhar model fitting the response of leaf Pn to intercellular CO2 concentration(Ci),with light intensity(1 500 molm-2s-1) and temperature(25 ℃) being controlled,showed that when Ci<400 molmol-1,the maximum carboxylation rate (Vcmax) was 91.6 molm-2s-1,the CO2 compensation point (Г *) was 46.5 molmol-1,and the respiration rate (Rd) was 4.9 molm-2s-1. From 400 to 1 000 molmol-1 of Ci,increasing the CO2 concentration increased leaf Pn and light utilization efficiency with a leaf CO2 saturation point (PCS) of about 1 000 molmol-1 and a maximum electron transport rate (Jmax) of 256.0 molm-2s-1. When Ci was supersaturated (>1 000 molmol-1),the rate of leaf triose phosphate utilization (UTP) was 19.7 molm-2s-1. [Ch,3 fig. 2 tab. 18 ref.]-
Key words:
- forest biology /
- Salix matsudana × alba /
- seedlings /
- photosynthetic characteristics /
- Farquhar model
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链接本文:
https://zlxb.zafu.edu.cn/article/doi/10.11833/j.issn.2095-0756.2010.03.004

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