Journal ArticleDOI
Separating root and soil microbial contributions to soil respiration: A review of methods and observations
TLDR
In this article, three primary methods have been used to distinguish hetero- versus autotrophic soil respiration including integration of components contributing to in situ forest soil CO2 efflux (i.e., litter, roots, soil), comparison of soils with and without root exclusion, and application of stable or radioactive isotope methods.Abstract:
Forest soil respiration is the sum of heterotrophic (microbes, soil fauna) and auto- trophic (root) respiration. The contribution of each group needs to be understood to evaluate implications of environmental change on soil carbon cycling and sequestration. Three primary methods have been used to distinguish hetero- versus autotrophic soil respiration including: integration of components contributing to in situ forest soil CO2 efflux (i.e., litter, roots, soil), comparison of soils with and without root exclusion, and application of stable or radioactive isotope methods. Each approach has advantages and disadvantages, but isotope based methods provide quantitative answers with the least amount of disturbance to the soil and roots. Pub- lished data from all methods indicate that root/rhizosphere respiration can account for as little as 10 percent to greater than 90 percent of total in situ soil respiration depending on vegetation type and season of the year. Studies which have integrated percent root contribution to total soil respiration throughout an entire year or growing season show mean values of 45.8 and 60.4 percent for forest and nonforest vegetation, respectively. Such average annual values must be extrapolated with caution, however, because the root contribution to total soil respiration is commonly higher during the growing season and lower during the dormant periods of the year. Abbreviations: TScer -t otal soil CO 2 efflux rate; f - fractional root contribution to TS cer; RC - root contribution to TScerread more
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Journal ArticleDOI
Comparing machine learning-derived global estimates of soil respiration and its components with those from terrestrial ecosystem models
Haibo Lu,Shihua Li,Minna Ma,Vladislav Bastrikov,Xiuzhi Chen,Philippe Ciais,Yongjiu Dai,Akihiko Ito,Weimin Ju,Sebastian Lienert,Danica Lombardozzi,Xingjie Lu,Fabienne Maignan,Mahdi Nakhavali,Timothy A. Quine,Andreas Schindlbacher,Jun Wang,Jun Wang,Ying-Ping Wang,Ying-Ping Wang,David Wårlind,Shupeng Zhang,Wenping Yuan +22 more
TL;DR: In this article, the authors developed models based on the global soil respiration database (version 50), using the random forest (RF) method to generate the global benchmark distribution of total soil (soil respiration) and its components.
Journal Article
Vertical and horizontal variation of carbon pools and fluxes in soil profile of wet southern taiga in European Russia
Hana Šantrůčková,Eva Kaštovská,Daniil Kozlov,Julya Kurbatova,Miluše Livečková,Olga Shibistova,Fedor Tatarinov,Jon Lloyd +7 more
TL;DR: In this article, the vertical and horizontal distributions of soil organic carbon, potential microbial activity and basic soil properties were studied in a boreal mixed forest (Central Forest Reserve, TVER region) to elucidate whether the soil CO2-efflux is related to basic soil characteristics that affect the C pool and activity.
Journal ArticleDOI
Wetland Soil Co2 Efflux Along a Latitudinal Gradient of Spatial and Temporal Complexity
TL;DR: In this paper, the authors investigated how different vegetation classes and abiotic factors along a latitudinal gradient of spatial and temporal complexity affect soil CO2 efflux, biomass, soil properties, and soil and air temperature were measured in July 2015 and January 2016 in situ at 10 sites along a 342-km Latitudinal gradient on the Atlantic coast of Florida.
Journal ArticleDOI
Seasonality of ecosystem respiration in a double-cropping paddy field in Bangladesh
TL;DR: In this paper, a tower-based eddy covariance technique was used to evaluate carbon dynamics in a double-rice cropping paddy field, and they found that the diurnal pattern of RE was driven by soil temperature (Ts) whereas the seasonal variation in RE was controlled primarily by Ts and soil water content (SWC).
Journal ArticleDOI
Contribution of root and rhizosphere respiration of Haloxylon ammodendron to seasonal variation of soil respiration in the Central Asian desert
TL;DR: In this paper, root and rhizosphere respiration originating from soil organic matter decomposition (Rd) were estimated from Rc (soil respiration under the crowns of Haloxylon ammodendron) and Rg (soIL respiration in the gaps between H. ammodenderron) of H.
References
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Journal ArticleDOI
The global carbon dioxide flux in soil respiration and its relationship to vegetation and climate
TL;DR: In this article, measured rates of soil respiration from terrestrial and wetland ecosystems were used to define the annual global CO 2 flux from soils, to identify uncertainties in the global flux estimate, and to investigate the influences of temperature, precipitation, and vegetation.
Journal ArticleDOI
Carbon Isotopes in PhotosynthesisFractionation techniques may reveal new aspects of carbon dynamics in plants
TL;DR: The fractionation of carbon isotopes that occurs during photosynthesis is one of the most useful techniques for investigating the efficiency of CO2 uptake and indicates that different strategies are needed for improving wateruse efficiency in different kinds of plants.
Journal ArticleDOI
Soil respiration and the global carbon cycle
TL;DR: In this paper, the authors provide a brief review for policymakers who are concerned that changes in soil respiration may contribute to the rise in CO2 in Earth's atmosphere, while simultaneously leaving a greater store of carbon in the soil.
Journal ArticleDOI
Model estimates of CO2 emissions from soil in response to global warming
TL;DR: In this article, the Rothamsted model is used to calculate the amount of CO2 that would be released from the world stock of soil organic matter if temperatures increase as predicted, the annual return of plant debris to the soil being held constant.
Journal ArticleDOI
Plant decomposition and soil respiration in terrestrial ecosystems
J. S. Singh,S. R. Gupta +1 more
TL;DR: In this article, a review deals with methodological approaches, measured rates, and environmental control of two major interdependent processes regulating the structure and function of terrestrial ecosystems, viz., plant decomposition and soil respiration.