Balance between carbon gain and loss in warmer environments: impacts on photosynthesis and leaf respiration in four temperate tree species.

IF 3.5 2区 农林科学 Q1 FORESTRY
Zhaoguo Wang, Xiaochun Wang, Bingxin Han, Di Liu, Chuankuan Wang
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引用次数: 0

Abstract

The temperature sensitivities of photosynthesis and respiration remain a key uncertainty in predicting how forests will respond to climate warming. We grew seedlings of four temperate tree species, including Betula platyphylla, Fraxinus mandshurica, Juglans mandshurica and Tilia amurensis, at three temperature regimes (ambient, +2 °C, and +4 °C in daytime air temperature). We investigated net photosynthesis (Anet25), maximum rate of RuBP-carboxylation (Vcmax25) and RuBP-regeneration (Jmax25), stomatal conductance (gs25), mesophyll conductance (gm25), and leaf respiration (Rleaf) in dark (Rdark25) and in light (Rlight25) at 25 °C in all species. Additionally, we examined the temperature sensitivities of Anet, Vcmax, Jmax, Rdark and Rlight in F. mandshurica. Our findings showed that the warming-induced decreases in Anet25, Vcmax25 and Jmax25 were more prevalent in the late-successional species T. amurensis. Warming had negative impacts on gs25 in all species. Overall, Anet25 was positively correlated with Vcmax25 and Jmax25 across all growth temperatures. However, a positive correlation between Anet25 and gs25 was observed only under warming conditions, and gs25 was negatively associated with vapor pressure deficit. This implies that the vapor pressure deficit-induced decrease in gs25 was responsible for the decline in Anet25 at higher temperatures. The optimum temperature of Anet in F. mandshurica increased by 0.59 °C per 1.0 °C rise in growth temperature. While +2 °C elevated the thermal optima of Jmax, it did not affect the other temperature sensitivity parameters of Vcmax and Jmax. Rdark25 was not affected by warming in any species, and Rlight25 was stimulated in T. amurensis. The temperature response curves of Rdark and Rlight in F. mandshurica were not altered by warming, implying a lack of thermal acclimation. The ratios of Rdark25 and Rlight25 to Anet25 and Vcmax25 in T. amurensis increased with warming. These results suggest that Anet and Rleaf did not acclimate to warming synchronously in these temperate tree species.

较暖环境中碳增量和碳减量之间的平衡:对四种温带树种光合作用和叶片呼吸作用的影响。
光合作用和呼吸作用对温度的敏感性仍然是预测森林如何应对气候变暖的关键不确定因素。我们在三种温度条件下(环境温度、白天气温+2°C 和 +4°C)培育了四种温带树种的幼苗,包括桦树(Betula platyphylla)、梣树(Fraxinus mandshurica)、桉树(Juglans mandshurica)和椴树(Tilia amurensis)。我们研究了所有物种在 25°C 黑暗(Rdark25)和光照(Rlight25)条件下的净光合作用(Anet25)、RuBP 羧化最大速率(Vcmax25)和 RuBP 再生最大速率(Jmax25)、气孔导度(gs25)、叶肉间质导度(gm25)、叶片呼吸(Rleaf)。此外,我们还研究了 F. mandshurica 的 Anet、Vcmax、Jmax、Rdark 和 Rlight 对温度的敏感性。我们的研究结果表明,气候变暖导致的 Anet25、Vcmax25 和 Jmax25 下降在晚生物种 T. amurensis 中更为普遍。气候变暖对所有物种的 gs25 都有负面影响。总体而言,在所有生长温度下,Anet25 与 Vcmax25 和 Jmax25 都呈正相关。然而,只有在升温条件下 Anet25 与 gs25 才呈正相关,而且 gs25 与蒸气压差(VPD)呈负相关。这意味着在较高温度下,蒸汽压亏损引起的 gs25 下降是 Anet25 下降的原因。生长温度每升高 1.0°C,F. mandshurica 的 Anet 最适温度升高 0.59°C。虽然 +2°C 升高了 Jmax 的最适温度,但并未影响其他温度敏感参数 Vcmax 和 Jmax。任何物种的 Rdark25 都不受升温的影响,而 T. amurensis 的 Rlight25 则受到刺激。F. mandshurica 的 Rdark 和 Rlight 的温度响应曲线没有因升温而改变,这意味着缺乏热适应。这些结果表明,这些温带树种的 Anet 和 Rleaf 并未同步适应气候变暖。
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来源期刊
Tree physiology
Tree physiology 农林科学-林学
CiteScore
7.10
自引率
7.50%
发文量
133
审稿时长
1 months
期刊介绍: Tree Physiology promotes research in a framework of hierarchically organized systems, measuring insight by the ability to link adjacent layers: thus, investigated tree physiology phenomenon should seek mechanistic explanation in finer-scale phenomena as well as seek significance in larger scale phenomena (Passioura 1979). A phenomenon not linked downscale is merely descriptive; an observation not linked upscale, might be trivial. Physiologists often refer qualitatively to processes at finer or coarser scale than the scale of their observation, and studies formally directed at three, or even two adjacent scales are rare. To emphasize the importance of relating mechanisms to coarser scale function, Tree Physiology will highlight papers doing so particularly well as feature papers.
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