Ruiping Tian, Luyao Li, Dongjia Zhang, Jun Zhang, Chuankuan Wang, Xiankui Quan
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The warming treatment significantly increased the maximum net photosynthetic rate (Pmax-a), photosynthetic nitrogen use efficiency (PNUE), maximum carboxylation rate (Vcmax), maximum electron transport rate (Jmax), triose phosphate utilization rate (TPU), mesophyll conductance (gm), leaf nitrogen content (Narea), and chlorophyll content (Chlm). Pmax-a was significantly positively associated with Vcmax, Jmax, TPU, gm, and Narea, and the slope of the linear regression between Pmax-a and Vcmax, Jmax, and TPU was greater in the warming treatment. The responses of Pmax-a, PNUE, Vcmax, Jmax, TPU, Narea, and Chlm to warming differed among provenances. As the aridity index of the original site increased, the magnitude of the warming treatment’s effect on Pmax-a, Vcmax, Jmax, and TPU represented a varying form of a bell-shaped curve. Overall, the warming treatment improved the photosynthetic capacity of L. gmelinii, but the extent of the improvement varied among provenances. 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引用次数: 0
摘要
达乌尔落叶松(Larix gmelinii)是北方森林的主要树种,其光合作用对气候变暖的响应对北方森林生态系统碳循环的建模和预测非常重要。1983 年,我们将 11 个产地的 L. gmelinii 树苗移植到两个气候条件不同(对照气候和气候变暖)的普通花园中。移植 40 年后,我们研究了叶片光合作用能力对气候变暖的响应及其在不同产地之间的差异。气候变暖处理明显提高了最大净光合速率(Pmax-a)、光合氮利用效率(PNUE)、最大羧化速率(Vcmax)、最大电子传输速率(Jmax)、磷酸三糖利用率(TPU)、叶绿体中层传导率(gm)、叶片含氮量(Narea)和叶绿素含量(Chlm)。Pmax-a与Vcmax、Jmax、TPU、gm和Narea明显正相关,Pmax-a与Vcmax、Jmax和TPU之间的线性回归斜率在升温处理中更大。不同产地的 Pmax-a、PNUE、Vcmax、Jmax、TPU、Narea 和 Chlm 对气候变暖的响应不同。随着原产地干旱指数的增加,加温处理对 Pmax-a、Vcmax、Jmax 和 TPU 的影响程度呈现不同形式的钟形曲线。总体而言,加温处理提高了 L. gmelinii 的光合能力,但不同产地的提高程度不同。这些发现为了解 L. gmelinii 对气候变暖的响应机制提供了启示。
Response of Photosynthetic Capacity to Climate Warming and Its Variation among 11 Provenances of Dahurian Larch (Larix gmelinii)
Dahurian larch (Larix gmelinii) is the dominant tree species in boreal forests, and its photosynthetic response to climate warming is important in modeling and predicting carbon cycling for boreal forest ecosystems. In 1983, seedlings of L. gmelinii from 11 provenances were transplanted into two common gardens with different climate conditions (control and warming climate). Forty years after the transplant, we investigated the response of leaf photosynthetic capacity to climate warming and its variation among provenances. The warming treatment significantly increased the maximum net photosynthetic rate (Pmax-a), photosynthetic nitrogen use efficiency (PNUE), maximum carboxylation rate (Vcmax), maximum electron transport rate (Jmax), triose phosphate utilization rate (TPU), mesophyll conductance (gm), leaf nitrogen content (Narea), and chlorophyll content (Chlm). Pmax-a was significantly positively associated with Vcmax, Jmax, TPU, gm, and Narea, and the slope of the linear regression between Pmax-a and Vcmax, Jmax, and TPU was greater in the warming treatment. The responses of Pmax-a, PNUE, Vcmax, Jmax, TPU, Narea, and Chlm to warming differed among provenances. As the aridity index of the original site increased, the magnitude of the warming treatment’s effect on Pmax-a, Vcmax, Jmax, and TPU represented a varying form of a bell-shaped curve. Overall, the warming treatment improved the photosynthetic capacity of L. gmelinii, but the extent of the improvement varied among provenances. These findings provide insights into the mechanisms underlying the responses of L. gmelinii to climate warming.
期刊介绍:
Forests (ISSN 1999-4907) is an international and cross-disciplinary scholarly journal of forestry and forest ecology. It publishes research papers, short communications and review papers. There is no restriction on the length of the papers. Our aim is to encourage scientists to publish their experimental and theoretical research in as much detail as possible. Full experimental and/or methodical details must be provided for research articles.