Effect of CO_2 concentration on photosynthesis in deciduous broad-leaved tree species
CO_2浓度对落叶阔叶树种光合作用的影响
基本信息
- 批准号:03660150
- 负责人:
- 金额:$ 1.41万
- 依托单位:
- 依托单位国家:日本
- 项目类别:Grant-in-Aid for General Scientific Research (C)
- 财政年份:1991
- 资助国家:日本
- 起止时间:1991 至 1993
- 项目状态:已结题
- 来源:
- 关键词:
项目摘要
(1) Effects of CO_2 levels on net photosynthesis of single leaf in several deciduous broad-leaved tree species : P_n and the saturated PAR were generally increased with inceasing CO_2 levels in most species tested. From the light-photosynthesis curves, we classified fagus crenate(Fc) as low CO_2-weak light use type, Zelkova serrata(Zs) as high CO_2-weak light use type, Alnus firma(Af) as high CO_2-strong light use type, and Ginkgo biloba(Gb) as high CO_2-intermediate type.(2) Effects of short-term CO_2 levels and temperatures on the photosynthesis and respiration of some deciduous broad-leaved tree species seedlings : Temperature-photosynthesis curves in strong light showed a distinct optimum curves. The optimum temperatures were found at 15-35゚C, the values shifted from low to high temperatures with increasing CO_2 levels. Among five species, Af & W.hortensis(Wh), shrub species, had a higher P_n and the broad optimum ranges. Fc, Qc & Gb, tree species, exhibited a contrasting pattern. (3) Effects of CO_2 levels on a leaf photosynthesis in Qc, Q.dentata(Qd) and Wh seedlings : CO_2 levels that saturated P_n were found above 900ppm in 2Quercus species, and 600ppm in Wh. The water use efficiency enhanced with higher CO_2 levels irrespective of species.(4) Effects of high CO_2 levels and water stress on gas exchange in Alnus firma : The rates of Pn, Tr and g_s decreased with increasing water stress. The critical water potentials were found at -12, -10, -8 bars, respectively. COn_2 effects were observed in Pn and g_s under well-watered conditions above -8 bar water potentials.
(1) CO_2水平对几种落叶阔叶树单叶净光合作用的影响:大多数树种的P_n和饱和PAR均随CO_2水平的升高而升高。从光-光合作用曲线上,我们将麻豆(fagus crenate, Fc)划分为低co_2 -弱光利用型,泽尔科瓦(Zelkova serrata, Zs)划分为高co_2 -弱光利用型,桤木(Alnus firma, Af)划分为高co_2 -强光利用型,银杏(Ginkgo biloba, Gb)划分为高co_2 -中间型。(2)短期CO_2水平和温度对部分落叶阔叶树幼苗光合和呼吸的影响:强光条件下温度-光合曲线表现出明显的最优曲线。在15 ~ 35℃的温度下,随着CO_2浓度的增加,温度由低到高。5个树种中,灌丛树种(af&w .hortensis, Wh)的P_n值较高,且最适范围较宽。不同树种Fc、Qc和Gb表现出不同的变化规律。(3) CO_2浓度对Qc、Qd和Wh幼苗叶片光合作用的影响:2种栎的CO_2浓度大于900ppm, Wh的CO_2浓度大于600ppm。水利用效率随CO_2浓度的升高而提高。(4)高CO_2水平和水分胁迫对桤木气体交换的影响:Pn、Tr和g_s速率随水分胁迫的增加而降低。临界水势分别为-12、-10、-8 bar。在水势高于-8 bar的条件下,在Pn和g_s中观察到COn_2效应。
项目成果
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