Respiration in light of evergreen and deciduous woody species and its links to the leaf economic spectrum
Respiration in light of evergreen and deciduous woody species and its links to the leaf economic spectrum
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DOI：
10.1093/treephys/tpad129
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发表时间：
2023-10-17
期刊：
影响因子：
4
通讯作者：
Cheng，Dongliang
中科院分区：
文献类型：
--
作者：
Li，Xueqin;Chen，Xiaoping;Cheng，Dongliang
叶片在光照下的呼吸（Rlight）对于理解单个植物和整个生态系统的净CO2交换至关重要。然而，Rlight在叶经济谱（LES）的背景下很少被量化，并且很少被讨论，特别是在植物功能类型（PFT）不同的木本物种（例如，万年青与落叶物种）。为了解决这一问题，测定了54种典型的亚热带万年青和落叶木本植物的Rlight、Rdark、光饱和光合速率（Asat）、单位面积叶干重（LMA）、叶片氮（N）和磷（P）浓度、最大羧化速率（Vcmax）和电子传递速率（Jmax）。除LMA外，在这项研究中量化的参数显着高于落叶树种比万年青树种。Rlight与LES性状如Asat、Rdark、LMA、N和P显著相关，Rlight与Rdark和N的关系在万年青和落叶树种之间具有共同的斜率，但在y截距上存在显著差异，其中在落叶树种中，对于任何给定的Rdark或N，Rlight的速率都是慢的或快的，分别一个基于三个特征的R光模型（即，Rdark、LMA和P）的解释力为84.9%。这些结果表明，Rlight和LES之间存在联系，并强调PFT是影响Rlight以及Rlight、Rdark和N之间关系的重要因素。因此，这项研究提供了信息，可以改善下一代陆地生物圈模型（TBMs）。
Leaf respiration in the light (Rlight) is crucial for understanding the net CO2exchange of individual plants and entire ecosystems. However,Rlightis poorly quantified and rarely discussed in the context of the leaf economic spectrum (LES), especially among woody species differing in plant functional types (PFTs) (e.g., evergreen vs. deciduous species). To address this gap in our knowledge,Rlight, respiration in the dark (Rdark), light-saturated photosynthetic rates (Asat), leaf dry mass per unit area (LMA), leaf nitrogen (N) and phosphorus (P) concentrations, and maximum carboxylation (Vcmax) and electron transport rates (Jmax) of 54 representative subtropical woody evergreen and deciduous species were measured. With the exception of LMA, the parameters quantified in this study were significantly higher in deciduous species than in evergreen species. The degree of light inhibition did not significantly differ between evergreen (52%) and deciduous (50%) species.Rlightwas significantly correlated with LES traits such asAsat,Rdark, LMA, N and P. TheRlightvs.Rdarkand N relationships shared common slopes between evergreen and deciduous species, but significantly differed in their y-intercepts, in which the rates ofRlightwere slower or faster for any givenRdarkor N in deciduous species, respectively. A model forRlightbased on three traits (i.e.,Rdark, LMA and P) had an explanatory power of 84.9%. These results show that there is a link betweenRlightand the LES, and highlight that PFTs is an important factor in affectingRlightand the relationships ofRlightwithRdarkand N. Thus, this study provides information that can improve the next generation of terrestrial biosphere models (TBMs).