Altitudinal changes in temperature responses of net photosynthesis and dark respiration in tropical bryophytes.

Altitudinal changes in temperature responses of net photosynthesis and dark respiration in tropical bryophytes.
复制标题

热带苔藓植物净光合作用和暗呼吸温度响应的海拔变化

DOI:
10.1093/aob/mcs267
复制
发表时间:
2013
期刊:
影响因子:
4.2
通讯作者:
M.Y. Bader
M.Y. Bader
中科院分区:
生物学2区
文献类型:
--
作者:
Wagner;G. Zotz;N. Salazar Allen ;M.Y. Bader

文献摘要

参考文献

被引文献

相似文献

在热带地区,随着海拔的升高,多水生物(苔藓、地钱和大型地衣)的数量显著增加。这项研究解决了这样一个假设,即在低地缺乏硼镁石是由于高温对碳平衡的影响。特别是,它是测试实验是否CO2交换率的温度响应将导致更高的呼吸碳损失在夜间,相对于潜在的每日收益,在低地相比,较低的山地forestsMethodsGas-exchange测量被用来确定水,光,三种海拔18种热带红树植物净光合作用和暗呼吸的CO2和温度响应曲线Key ResultsThe optimum temperature of net photosynthesis was closely related to the mean temperature in the hospitals which the species grow in different altitude.在平均环境昼夜温度下,暗呼吸与净光合作用的比率并没有像预期的那样随着海拔的升高而降低。水,光和CO2-反应不同物种之间,但不系统与altitude.ConclusionsDrivers以外的温度依赖性代谢率必须更重要的是在解释海拔梯度在britonite丰度。这并没有放弃近零的碳平衡作为一个主要问题的低地物种,但温度的主要影响可能在于增加蒸发率,从而限制了光合作用的时间碳增益,而不是在增加夜间呼吸速率。由于光合作用的最佳温度与栖息地温度的关系如此之好,我们分析了世界范围内已发表的bratite物种的温度反应,发现了与我们研究的热带山坡沿着相同的大尺度模式。
Background and AimsThere is a conspicuous increase of poikilohydric organisms (mosses, liverworts and macrolichens) with altitude in the tropics. This study addresses the hypothesis that the lack of bryophytes in the lowlands is due to high-temperature effects on the carbon balance. In particular, it is tested experimentally whether temperature responses of CO2-exchange rates would lead to higher respiratory carbon losses at night, relative to potential daily gains, in lowland compared with lower montane forests.MethodsGas-exchange measurements were used to determine water-, light-, CO2- and temperature-response curves of net photosynthesis and dark respiration of 18 tropical bryophyte species from three altitudes (sea level, 500 m and 1200 m) in Panama.Key ResultsOptimum temperatures of net photosynthesis were closely related to mean temperatures in the habitats in which the species grew at the different altitudes. The ratio of dark respiration to net photosynthesis at mean ambient night and day temperatures did not, as expected, decrease with altitude. Water-, light- and CO2-responses varied between species but not systematically with altitude.ConclusionsDrivers other than temperature-dependent metabolic rates must be more important in explaining the altitudinal gradient in bryophyte abundance. This does not discard near-zero carbon balances as a major problem for lowland species, but the main effect of temperature probably lies in increasing evaporation rates, thus restricting the time available for photosynthetic carbon gain, rather than in increasing nightly respiration rates. Since optimum temperatures for photosynthesis were so fine tuned to habitat temperatures we analysed published temperature responses of bryophyte species worldwide and found the same pattern on the large scale as we found along the tropical mountain slope we studied.
CO2交换与Rhacomitrium lanuginosum和Dicranum elongatum的生长
DOI: --
发表时间: 1975
期刊:
影响因子: --
作者:
P. Kallio;S. Heinonen
通讯作者: S. Heinonen
DOI: --
发表时间: 1994
期刊:
影响因子: --
作者:
O. Lange;B. Büdel;H. Zellner;G. Zotz;A. Meyer
通讯作者: A. Meyer
热带条件下地衣碳增益:巴拿马低山雨林中三种 Leptogium 物种的水关系和 CO2 交换
DOI: --
发表时间: 2000
期刊:
影响因子: --
作者:
O. Lange;A. Meyer;H. Zellner;B. Büdel;G. Zotz
通讯作者: G. Zotz
热带大型地衣 Sticta tomentosa 的水关系和 CO2 交换的原位研究
DOI: --
发表时间: 1998
期刊:
影响因子: --
作者:
G. Zotz;B. Büdel;A. Meyer;H. Zellner;O. Lange
通讯作者: O. Lange
DOI: --
发表时间: 1959
期刊:
影响因子: --
作者:
J. Tallis
通讯作者: J. Tallis