Photosynthetic phenological variation may promote coexistence among co-dominant tree species in a Madrean sky island mixed conifer forest
Photosynthetic phenological variation may promote coexistence among co-dominant tree species in a Madrean sky island mixed conifer forest
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光合物候变化可能促进马德雷天空岛混交针叶林共优势树种的共存
DOI：
10.1093/treephys/tpx076
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发表时间：
2017
期刊：
影响因子：
4
通讯作者：
Barron-Gafford, G.A.
中科院分区：
文献类型：
--
作者：
Potts, D.L.;Minor, R.L.;Braun, Z.;Barron-Gafford, G.A.
在北美西部的大部分地区，由于人为气候变暖，预计森林将经历从以雪为主到以雨为主的降水模式的转变。马德兰天空岛混合针叶林的大部分降水来自夏季的对流风暴，这可能是长期变暖后雪占主导的森林未来的一个镜头。为了更好地了解混合针叶林生理性状、气候变化与结构和功能之间的联系，我们测量了叶片光合作用(A)对内部co2浓度（Ci）受控变化的响应，以量化黄松（Pinus ponderosaLawson and C. Lawson）、西南白松（Pinus strobiformisEngelm.）和道格拉斯冷杉（Pseudotsuga menziesii(Mirb.)）的种间物候变化。弗朗哥)。在环境条件下（Anet），物种的净光合作用对夏季季风降水的开始有类似的正响应，但在一年中较冷的部分。黄栌树能够维持比p更大的湿度。menziesiiandP。strobiformis。此外,P。黄松对短暂有利的春季条件的反应比黄松和黄松都要强烈。menziesiiorP。strobiformis。季风降水与最大电子传递速率（Jmax）和羧基化速率（VCmax）的急剧上升有关。与p比较。ponderosaandP。strobiformis。相比之下，物种对冬季凉爽温度的反应具有相似的低jmaxin和vcmaxin值。相对气孔限制模式遵循基于物种海拔分布的预测，强化了气孔行为在维持水力传导性和形成生物气候限制中的作用。马德林混交针叶林共生树种间生态生理性状的物候变化可能促进资源的时间分配，从而促进物种的共存。此外，这些结果为预测北美混合针叶林目前从雪为主向雨为主转变的生态影响提供了生理基础。
Across much of western North America, forests are predicted to experience a transition from snow- to rain-dominated precipitation regimes due to anthropogenic climate warming. Madrean sky island mixed conifer forests receive a large portion of their precipitation from summertime convective storms and may serve as a lens into the future for snow-dominated forests after prolonged warming. To better understand the linkage between physiological traits, climate variation, and the structure and function of mixed conifer forests, we measured leaf photosynthetic (A) responses to controlled variation in internal CO2concentration (Ci) to quantify interspecific phenological variation inA/Ci-derived ecophysiological traits among ponderosa pine (Pinus ponderosaLawson and C. Lawson), southwestern white pine (Pinus strobiformisEngelm.) and Douglas-fir (Pseudotsuga menziesii(Mirb.) Franco). Species had similar, positive responses in net photosynthesis under ambient conditions (Anet) to the onset of summertime monsoonal precipitation, but during the cooler portions of the yearP. ponderosawas able to maintain greaterAnetthanP. menziesiiandP. strobiformis. Moreover,P. ponderosahad greaterAnetin response to ephemerally favorable springtime conditions than eitherP. menziesiiorP. strobiformis. Monsoonal precipitation was associated with a sharp rise in the maximum rates of electron transport (Jmax) and carboxylation (VCmax) inP. menziesiiin comparison withP. ponderosaandP. strobiformis. In contrast, species shared similar low values ofJmaxandVCmaxin response to cool winter temperatures. Patterns of relative stomatal limitation followed predictions based on species’ elevational distributions, reinforcing the role of stomatal behavior in maintaining hydraulic conductivity and shaping bioclimatic limits. Phenological variation in ecophysiologial traits among co-occurring tree species in a Madrean mixed conifer forest may promote temporal resource partitioning and thereby contribute to species’ coexistence. Moreover, these results provide a physiological basis for predicting the ecological implications of North American mixed conifer forests currently transitioning from snow- to rain-dominated precipitation regimes.
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球松（西南白松）林分动态、再生和干扰生态学：综述
DOI：
--
发表时间：
2013
期刊：
影响因子：
--
作者：
Christopher E. Looney;K. Waring
通讯作者：
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影响因子：
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DOI：
--
发表时间：
1988
期刊：
影响因子：
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作者：
J. A. Fites;R. Teskey
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R. Teskey
影响因子：
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作者：
F. Shreve
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DOI：
--
发表时间：
2008
期刊：
影响因子：
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作者：
S. Archer;K. Predick
通讯作者：
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