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
Citations
More filters
Journal ArticleDOI
Soil respiration after six years of continuous drought stress in the tropical rainforest in Southwest China
Liguo Zhou,Liguo Zhou,Yuntong Liu,Yuntong Liu,Yiping Zhang,Yiping Zhang,Liqing Sha,Liqing Sha,Qinghai Song,Qinghai Song,Wenjun Zhou,Wenjun Zhou,D. Balasubramanian,D. Balasubramanian,Gnanamoorthy Palingamoorthy,Gnanamoorthy Palingamoorthy,Jinbo Gao,Jinbo Gao,Youxing Lin,Youxing Lin,Jing Li,Jing Li,Ruiwu Zhou,Ruiwu Zhou,Sai Tay Zar Myo,Sai Tay Zar Myo,Xianhui Tang,Xianhui Tang,Jin Zhang,Jin Zhang,Peng Zhang,Peng Zhang,Shusen Wang,John Grace +33 more
TL;DR: Wang et al. as discussed by the authors conducted a 2-year field experiment in the seventh and eighth year of long-term artificially droughted plots within a tropical rainforest in Xishuangbanna, southwest China.
Journal ArticleDOI
Effects of simulated increased grazing on carbon allocation patterns in a high arctic mire
TL;DR: In this article, an in-situ field experiment was conducted over 3 years in a high arctic mire at Zackenberg in NE Greenland, with five replicates of each (1) control, (2) vascular plants were removed (NV), (3) clipped twice each growing season in order to simulate increased muskox grazing.
Journal ArticleDOI
Partitioning heterotrophic and rhizospheric soil respiration in a mature Douglas-fir (Pseudotsuga menziesii) forest
TL;DR: Total belowground respiration was partitioned into heterotrophic (Rh) and rhizospheric (Rr) respiration to determine the amount of CO2 originating from each component in a coastal Douglas-fir forest to assess potential sources of error.
Journal ArticleDOI
Catchment-Scale Shifts in the Magnitude and Partitioning of Carbon Export in Response to Changing Hydrologic Connectivity in a Northern Hardwood Forest
TL;DR: In this article, a 5-year study of a northern hardwood forested catchment indicated that hydrologic connectivity affected both the magnitude and fate of carbon export, with less carbon export during relatively low discharge years.
Journal ArticleDOI
Internal recycling of respired CO 2 may be important for plant functioning under changing climate regimes.
TL;DR: This study infused a 13C label at the stem base of field-grown Populus deltoides Bartr.
References
More filters
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.