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首页> 外文期刊>Journal of Geophysical Research. Biogeosciences >Interpretation and evaluation of combined measurement techniques for soil CO_2 efflux: Discrete surface chambers and continuous soil CO_2 concentration probes
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Interpretation and evaluation of combined measurement techniques for soil CO_2 efflux: Discrete surface chambers and continuous soil CO_2 concentration probes

机译：土壤CO_2排放综合测量技术的解释和评估：离散表面室和连续土壤CO_2浓度探针

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摘要

Soil CO2 efflux is a large respiratory flux from terrestrial ecosystems and a critical component of the global carbon (C) cycle. Lack of process understanding of the spatiotemporal controls on soil CO2 efflux limits our ability to extrapolate from fluxes measured at point scales to scales useful for corroboration with other ecosystem level measures of C exchange. Additional complications are introduced by the effects of soil water content seasonality and rainfall on the performance of measurement techniques. In this paper we present measurements of soil CO2 efflux made at two contrasting sites within a characteristic subalpine forest of the northern Rocky Mountains. Comparison of measurements between the soil respiration chamber technique and the soil CO2 profile technique over daily and seasonal time scales indicated that soil water content plays a major role in the magnitude and seasonality of soil CO2 efflux, especially after snowmelt or following summer rainfall. Agreement between both techniques was limited during high soil water content conditions and after summer rainfall. Differences in diel hysteresis patterns of soil CO2 efflux between sites were controlled by the effects of canopy cover and temporal differences in photosynthetic activity of vegetation. Our results indicate that an accurate parameterization of soil water content heterogeneity in space and time must be a critical component of realistic model representations of soil CO2 efflux from heterogeneous landscapes.
机译：土壤CO2排放是来自陆地生态系统的大呼吸通量，是全球碳（C）循环的关键组成部分。缺乏对土壤CO2排放时空控制的过程理解，这限制了我们从点尺度测得的通量推断为可与其他生态系统水平的C交换度量相佐证的尺度的能力。土壤水分的季节性和降雨对测量技术性能的影响也带来了其他复杂性。在本文中，我们介绍了在落基山北部的一个特征性亚高山森林内两个对比点进行的土壤CO2排放量的测量。通过对土壤呼吸室技术和土壤CO2剖面技术在日常和季节性尺度上的测量结果进行比较，结果表明，土壤含水量在土壤CO2排放量和季节性中起着重要作用，尤其是在融雪或夏季降雨后。在高土壤水分条件下和夏季降雨后，两种技术之间的一致性受到限制。冠层覆盖效应和植被光合作用的时间差异可控制站点之间土壤CO2排放的狄尔滞后模式差异。我们的结果表明，在空间和时间上对土壤水分异质性进行准确的参数化必须是来自异质性景观的土壤CO2排放真实模型表示的关键组成部分。

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