Coupling of Tree Growth and Photosynthetic Carbon Uptake Across Six North American Forests
Coupling of Tree Growth and Photosynthetic Carbon Uptake Across Six North American Forests
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DOI：
10.1029/2021jg006690
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发表时间：
2022-04
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通讯作者：
A. Teets;D. Moore;M. R. Alexander;P. Blanken;G. Bohrer;S. Burns;M. Carbone;M. Ducey;S. Fraver;C. Gough;D. Hollinger;G. Koch;T. Kolb;J. W. Munger;K. Novick;S. Ollinger;A. Ouimette;N. Pederson;D. Ricciuto;B. Seyednasrollah;C. Vogel;A. Richardson
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作者：
A. Teets;D. Moore;M. R. Alexander;P. Blanken;G. Bohrer;S. Burns;M. Carbone;M. Ducey;S. Fraver;C. Gough;D. Hollinger;G. Koch;T. Kolb;J. W. Munger;K. Novick;S. Ollinger;A. Ouimette;N. Pederson;D. Ricciuto;B. Seyednasrollah;C. Vogel;A. Richardson
将林分水平生物量增长的生物计量测量与基于塔式的碳吸收测量（总初级生产力和净生态系统生产力）联系起来，一直是众多生态系统水平研究的重点，旨在更好地了解调节碳分配到缓慢周转木材生物量池的因素。然而，这些研究中很少有研究前一年的吸收对增长的重要性。我们测试了木材生物量增量（WBI）和不同的时间段的碳吸收从当前和以前的几年之间的关系，调查固定碳的潜在滞后分配到6个成熟的，温带森林之间的增长。我们发现WBI与整个空间的碳吸收密切相关（即，不同地点的长期平均值），但在年度时间尺度上，WBI与碳吸收的相关性要小得多，这表明C固定和生物量分配之间的时间不匹配。我们在六个地点中的三个地点发现了前一年的碳吸收分配到WBI的滞后。年度WBI较高的站点与碳吸收的相关性总体上较强，与前一年的碳吸收相关性最强。只有一个研究中心的WBI与本年度的吸收率有很强的正相关关系，而与上一年无关。WBI率低的森林与前一年的碳吸收相关性较弱，与当年气候条件的关系较强。我们的工作显示了一个重要的，但不是普遍的，前一年的碳吸收的滞后分配的作用，在温带森林的增长。
Linking biometric measurements of stand‐level biomass growth to tower‐based measurements of carbon uptake—gross primary productivity and net ecosystem productivity—has been the focus of numerous ecosystem‐level studies aimed to better understand the factors regulating carbon allocation to slow‐turnover wood biomass pools. However, few of these studies have investigated the importance of previous year uptake to growth. We tested the relationship between wood biomass increment (WBI) and different temporal periods of carbon uptake from the current and previous years to investigate the potential lagged allocation of fixed carbon to growth among six mature, temperate forests. We found WBI was strongly correlated to carbon uptake across space (i.e., long‐term averages at the different sites) but on annual timescales, WBI was much less related to carbon uptake, suggesting a temporal mismatch between C fixation and allocation to biomass. We detected lags in allocation of the previous year's carbon uptake to WBI at three of the six sites. Sites with higher annual WBI had overall stronger correlations to carbon uptake, with the strongest correlations to carbon uptake from the previous year. Only one site had WBI with strong positive relationships to current year uptake and not the previous year. Forests with low rates of WBI demonstrated weak correlations to carbon uptake from the previous year and stronger relationships to current year climate conditions. Our work shows an important, but not universal, role of lagged allocation of the previous year's carbon uptake to growth in temperate forests.