Minor carbon sequestration under nitrogen deposition due to downregulated nitrogen uptake and use efficiency

IF 5.6 1区 农林科学 Q1 AGRONOMY
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Abstract

Global nitrogen (N) deposition substantially enhances ecosystem carbon cycling but usually results in minor carbon sequestration. The mechanisms underlying the minor stimulation of N deposition on carbon sequestration are not fully understood. Here, we used 22 sets of observations from a gradient N addition experiment with rates at 0, 2, 4, 8, 16, to 32 g N·m-2·year-1 in an alpine meadow ecosystem to constrain parameterization of the process-oriented Grassland ECOsystem (GECO) model. Our results indicate that the parameters related to plant N uptake and photosynthetic N use efficiency are proportionally downregulated with the rate of N addition. This is, the higher the rate of N addition, the larger the downward adjustment is in plant N uptake and use efficiency. GECO with parameter values not being adjusted to N treatments simulated higher annual GPP by 16.7 ± 7.1 %, 20.7 ± 6.7 %, 25.2 ± 8.2 %, 23.1 ± 7.0 %, and 49.5 ± 9.1 % under addition rates of 2, 4, 8, 16, and 32 g N·m-2·year-1, respectively, in comparison to these with parameter adjustment. Similarly, the ecosystem C storage simulated by GECO model without parameter adjustment was higher by 4.4 ± 2.5 % to 12.0 ± 3.0 % under these with parameter adjustment. Without adjustment of ecosystem physiological processes, such as the plant N uptake rate and use efficiency, Earth system models (ESMs) generally overestimate C uptake and storage under N deposition. Therefore, it is essential to incorporate these adjustments into ESMs to realistically predict global C dynamics under future N enrichment and its feedback to climate change.

氮沉降条件下,氮吸收和利用效率下调导致碳固存减少
全球氮(N)沉积大大加强了生态系统的碳循环,但通常只产生少量固碳作用。氮沉降对固碳的微弱刺激机制尚未完全明了。在此,我们利用在高山草甸生态系统中进行的氮添加率为 0、2、4、8、16 至 32 g N-m-2-year-1 的梯度实验的 22 组观测数据,来限制面向过程的草地生态系统(GECO)模型的参数设置。我们的研究结果表明,与植物氮吸收和光合作用氮利用效率相关的参数随氮添加速率的增加而呈比例下调。也就是说,氮添加率越高,植物对氮的吸收和利用效率的下调幅度越大。在添加率为 2、4、8、16 和 32 g N-m-2-year-1 时,参数值未根据氮处理进行调整的 GECO 模拟的年 GPP 分别比参数调整后的高 16.7 ± 7.1 %、20.7 ± 6.7 %、25.2 ± 8.2 %、23.1 ± 7.0 % 和 49.5 ± 9.1 %。同样,GECO 模型模拟的生态系统碳储量在未进行参数调整的情况下,在进行参数调整的情况下分别增加了 4.4 ± 2.5 % 和 12.0 ± 3.0 %。如果不调整生态系统的生理过程,如植物对氮的吸收率和利用效率,地球系统模式(ESM)通常会高估氮沉积下的碳吸收和储存量。因此,必须将这些调整纳入 ESM,以真实地预测未来氮富集下的全球碳动态及其对气候变化的反馈。
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来源期刊
CiteScore
10.30
自引率
9.70%
发文量
415
审稿时长
69 days
期刊介绍: Agricultural and Forest Meteorology is an international journal for the publication of original articles and reviews on the inter-relationship between meteorology, agriculture, forestry, and natural ecosystems. Emphasis is on basic and applied scientific research relevant to practical problems in the field of plant and soil sciences, ecology and biogeochemistry as affected by weather as well as climate variability and change. Theoretical models should be tested against experimental data. Articles must appeal to an international audience. Special issues devoted to single topics are also published. Typical topics include canopy micrometeorology (e.g. canopy radiation transfer, turbulence near the ground, evapotranspiration, energy balance, fluxes of trace gases), micrometeorological instrumentation (e.g., sensors for trace gases, flux measurement instruments, radiation measurement techniques), aerobiology (e.g. the dispersion of pollen, spores, insects and pesticides), biometeorology (e.g. the effect of weather and climate on plant distribution, crop yield, water-use efficiency, and plant phenology), forest-fire/weather interactions, and feedbacks from vegetation to weather and the climate system.
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