金合欢全株蒸腾作用对二氧化碳浓度的适应性。

Acclimation of whole-plant Acacia farnesiana transpiration to carbon dioxide concentration.

作者信息

Dugas W A, Polley H W, Mayeux H S, Johnson H B

机构信息

Blackland Research and Extension Center, Texas Agricultural Experiment Station, 720 E. Blackland Road, Temple, TX 76502, USA.

出版信息

Tree Physiol. 2001 Jul;21(11):771-3. doi: 10.1093/treephys/21.11.771.

DOI:10.1093/treephys/21.11.771

PMID:11470664

Abstract

Transpiration per unit leaf area of Acacia farnesiana (L.) Willd. plants grown at a CO2 concentration ([CO2]) of 385 micromol x mol(-1) was about twice that of plants grown at 980 micromol x mol(-1). However, whes plants grown for more than a year at 980 micromol x mol(-1) were exposed to 380 micromol x mol(-1) for 9 days, they transpired at half the rate of those that had been grown at 380 micromol x mol(-1)1. Similarly, plants grown at 380 micromol x mol(-1), when exposed to 980 micromol x mol(-1), transpired at twice the rate of those grown at 980 micromol x mol(-1). Thus, the effects of elevated [CO2] on whole-plant transpiration, like those on photosynthesis, respiration and stomatal conductance, cannot reliably be extrapolated from measurements made during short-term exposure to elevated [CO2].

摘要

在二氧化碳浓度（[CO₂]）为385微摩尔×摩尔⁻¹条件下生长的阿拉伯金合欢（Acacia farnesiana (L.) Willd.）植株，其单位叶面积的蒸腾作用约为在980微摩尔×摩尔⁻¹条件下生长植株的两倍。然而，当在980微摩尔×摩尔⁻¹条件下生长一年以上的植株暴露于380微摩尔×摩尔⁻¹环境9天时，它们的蒸腾速率仅为在380微摩尔×摩尔⁻¹条件下生长植株的一半。同样，在380微摩尔×摩尔⁻¹条件下生长的植株，当暴露于980微摩尔×摩尔⁻¹环境时，其蒸腾速率是在980微摩尔×摩尔⁻¹条件下生长植株的两倍。因此，[CO₂]升高对整株植物蒸腾作用的影响，与对光合作用、呼吸作用和气孔导度的影响一样，不能从短期暴露于升高的[CO₂]期间所做的测量中可靠地推断出来。