Soil respiration soc

Soils are the largest terrestrial carbon store and soil respiration is the second-largest flux in ecosystem carbon cycling. Across China's temperate region, climatic changes and human activities have frequently caused the transformation of soil respiration soc to woodlands, soil respiration soc. However, the effect of this transition on soil respiration and soil organic carbon SOC dynamics remains uncertain in this area.

Although many studies have reported net gains of soil organic carbon SOC after afforestation on croplands, this is uncertain for Chinese paddy rice croplands. Here, we aimed to evaluate the effects of afforestation of paddy rice croplands on SOC sequestration and soil respiration R s. Such knowledge would improve our understanding of the effectiveness of various land use options on greenhouse gas mitigation in China. The investigation was conducted on the Chongming Island, north subtropical China. Field sites were reclaimed from coastal salt marshes in the s, and soils were homogeneous with simple land use histories. SOC stocks and R s levels were monitored over one year in a paddy rice cropland, an evergreen and a deciduous broad-leaved plantation established on previous paddy fields and a reference fallow land site never cultivated. Laboratory incubation of soil under fast-changing temperatures was used to compare the temperature sensitivity Q 10 of SOC decomposition across land uses.

Soil respiration soc

The authors present results from a temporally extensive dataset providing insights into soil respiration dynamics in urban green spaces. The objectives were to distinguish differences in soil respiration rates measured in different types of tree-covered urban greenspace as well as assessing the impact of the UHI effect and increased irrigation on soil respiration. Results suggest that despite differences in sites, management, tree cover, SOC and soil temperature there were no distinct differences in soil respiration - possibly due to similar soil moisture contents across the sites. Overall, the paper is well written with clear objectives and conclusions supported by the results. The use of an ecosystem model to understand UHI effects and the impact of irrigation on soil respiration seems to be an interesting approach and encourages further studies to simulate the urban carbon cycle for different future scenarios. However, there is a need to add further information about the ecosystem model as outlined below. It also seems there are a lot of assumptions being made about model inputs and it is not always clear how these vary across the different sites and whether these introduce any uncertainties into the model results. P5 L Measurements were undertaken between 8 AM and 4 PM — did you notice any diurnal variations depending on the time of day the measurements were taken? And if so, how did this affect results? As mentioned above, this section is not very clear. It may help summarising the general inputs met data, vegetation data, soil characteristics and outputs of the model and how these were determined for the forest and park site.

However, the uniform soil texture under different land uses Table 1 and their common origin from estuarine sediments suggested that it was reasonable to assume similar SOC backgrounds at all sites before land use changes. Schindlbacher A, Zechmeister-Boltenstern S, soil respiration soc, Jandl R Carbon losses due to soil warming: Do autotrophic and heterotrophic soil respiration respond equally?

Microbial respiration soil respiration is defined as oxygen uptake or carbon dioxide evolution by bacteria, fungi, algae and protozoans, and includes the gas exchange of aerobic and anaerobic metabolism Anderson Soil respiration results from the degradation of organic matter e. This soil biological activity consists of numerous individual activities; the formation of C0 2 is the last step of carbon mineralization. In undisturbed soils no nutrient addition etc. Upon a disturbance, e.

Thank you for visiting nature. You are using a browser version with limited support for CSS. To obtain the best experience, we recommend you use a more up to date browser or turn off compatibility mode in Internet Explorer. In the meantime, to ensure continued support, we are displaying the site without styles and JavaScript. The sensitivity of soil microbial respiration to warming Q 10 remains a major source of uncertainty surrounding the projections of soil carbon emissions to the atmosphere as the factors driving Q 10 patterns across ecosystems have been assessed in isolation from each other. Here we report the results of a warming experiment using soils from sites across all continents and major biomes to simultaneously evaluate the main drivers of global Q 10 patterns. Compared with biochemical recalcitrance, mineral protection, substrate quantity and environmental factors, the soil microbiome that is, microbial biomass and bacterial taxa explained the largest portion of variation in Q 10 values.

Soil respiration soc

Thank you for visiting nature. You are using a browser version with limited support for CSS. To obtain the best experience, we recommend you use a more up to date browser or turn off compatibility mode in Internet Explorer. In the meantime, to ensure continued support, we are displaying the site without styles and JavaScript. The global soil-to-atmosphere or total soil respiration, R S carbon dioxide CO 2 flux is increasing 3 , 4 , but the degree to which climate change will stimulate carbon losses from soils as a result of heterotrophic respiration R H remains highly uncertain 5 , 6 , 7 , 8. Here we use an updated global soil respiration database 9 to show that the observed soil surface R H : R S ratio increased significantly, from 0.

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Search Search by keyword or author Search. Also, paddy soils had higher annual R s than afforested soils; R s abruptly increased after paddy fields were drained and plowed and remained distinctively high throughout the dry farming period. Glob Change Biol 8 : — SWC was only obtained during the growing season because the probe could not be fully inserted into the frozen soil in winter. Seasonal dynamics of soil respiration SR among five adjacent vegetation types. Abstract Changes in soil organic carbon SOC stability may alter carbon release from the soil and, consequently, atmospheric CO 2 concentration. Site characteristics and physical and chemical properties of topsoil 0—20 cm. The herbaceous layer of Siberian crabapple is dominated by Veronica linariifolia Pall. Environ Earth Sci — After 15—20 years of afforestation on paddy rice croplands, we observed increases in SOC concentrations at the soil surface 0—5cm. Publish with us For authors Language editing services Submit manuscript. Our study showed that the depositional profiles were enriched in SOC at subsoil depth and that they stored significantly more SOC than the non-eroding or eroding profiles Fig. The soil pH was measured with a calomel electrode on a paste of

Thank you for visiting nature. You are using a browser version with limited support for CSS. To obtain the best experience, we recommend you use a more up to date browser or turn off compatibility mode in Internet Explorer.

Mineral control of organic carbon mineralization in a range of temperate conifer forest soils. However, few reports on soil respiration and SOC dynamics are available. This would influence the calculation of regional carbon balance in China. View Article Google Scholar 6. Measured forest soil C stocks and estimated turnover times along an elevation gradient. The advantages of paddy soils in offsetting CO 2 emission over upland soils in China has long been realized Lal ; Pan et al. For measurement of soil respiration, six polyvinyl chloride collars 20cm in diameter and 12cm in height per plot were inserted 9cm deep into soil. Earth Sci Rev — Also, laboratory incubation under fast-changing temperatures was conducted to compare the temperature sensitivity of SOC decomposition between paddy and afforested soils. The soil available N was determined using an alkaline hydrolysis method described by Wang et al. Land uses with the same letters are not significantly different in SOC concentrations at each depth or in SOC stocks up to 1 m depth. Journal of Geophysical Research-Biogeosciences G Full size image. The results show that the depositional profiles store 5.