Soil respiration soc

Thank you for visiting nature.

Ecological Processes volume 8 , Article number: 28 Cite this article. Metrics details. Although soil erosion plays a key role in the carbon cycle, a holistic and mechanistic understanding of the soil erosion process within the cycle is still lacking. The aim of this study was therefore to improve our mechanistic understanding of soil organic carbon SOC and soil respiration dynamics through an experiment conducted in an eroding black soil farmland landscape in Northeast China. The depositional profiles store 5. Furthermore, the fractions of intermediate C and the microaggregate C were lowest at the eroding position and highest at the depositional position. In the depositional topsoil, the input of labile materials plays a promotional role in soil respiration.

Soil respiration soc

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. After 15—20 years of afforestation on paddy fields, SOC concentration only slightly increased at the depth of 0—5cm but decreased in deeper layers, which resulted in a net loss of SOC stock in the top 40cm. Seasonal increase of SOC was observed during the rice-growing period in croplands but not in afforested soils, suggesting a stronger SOC sequestration by paddy rice cropping. However, SOC sequestered under cropping was more labile, as indicated by its higher contents of dissolved organic carbon and microbial biomass. 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. Laboratory incubation revealed that paddy soils had a much higher Q 10 of SOC decomposition than afforested soils. Given that temperature was the primary controller of R s in this region, it was concluded that despite the stronger SOC sequestration by paddy rice cropping, its SOC was less stable than in afforested systems and might be more easily released into the atmosphere under global warming.

Z Pflanzenernaehr Bodenkd 26 —

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 grasslands to woodlands. However, the effect of this transition on soil respiration and soil organic carbon SOC dynamics remains uncertain in this area. In this study, we measured in situ soil respiration and SOC storage over a two-year period Jan. The variation in soil respiration among different vegetation types could be well explained by SOC and soil total nitrogen content.

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. Because soil respiration RS is the primary mechanism through which soil carbon is released into the atmosphere at a global scale, investigating the dynamic characteristics of the soil respiration rate in reclaimed coastal wetlands is necessary to understand its important role in maintaining the global C cycle. In the present study, seasonal and diurnal changes in soil respiration were monitored in one bare wetland CK and two reclaimed wetlands CT, a cotton monoculture pattern, and WM, a wheat—maize continuous cropping pattern in the Yellow River Delta. At the diurnal scale, the RS at the three study sites displayed single-peak curves, with the lowest values occurring at midnight a. Bare wetland conversion to croplands significantly elevated the soil organic carbon SOC pool.

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. Most ecosystem models predict that climate warming will stimulate microbial decomposition of soil carbon, producing a positive feedback to rising global temperatures 1 , 2. Although field experiments document an initial increase in the loss of CO 2 from soils in response to warming, in line with these predictions, the carbon dioxide loss from soils tends to decline to control levels within a few years 3 , 4 , 5. This attenuation response could result from changes in microbial physiological properties with increasing temperature, such as a decline in the fraction of assimilated carbon that is allocated to growth, termed carbon-use efficiency 6.

Hand cut with blade images

It would help having a sentence to introduce the purpose of this section ie comparing temporal variations of modelled reference to observations? Soil organic matter turnover is governed by accessibility not recalcitrance. The meadow grassland is zonal vegetation dominated by L. Although elevation was the key driver of variation in climate properties, the SOC decomposition during the day incubation had no significant relationship with elevation on our study mountain. This article is cited by The potential for an old-growth forest to store carbon in the topsoil: A case study at Sasso Fratino, Italy Tommaso Chiti Nicola Benilli Giacomo Certini Journal of Forestry Research Nitrogen addition reduced carbon mineralization of aggregates in forest soils but enhanced in paddy soils in South China Ruirui Cao Longchi Chen Haimei Li Ecological Processes Effects of stand density on soil respiration and labile organic carbon in different aged Larix principis-rupprechtii plantations Tairui Liu Daoli Peng Yunxiang Zhang Ecological Processes Changes in soil organic carbon, nitrogen and sulphur along a slope gradient in apple orchard soils of Kashmir Himalaya Javaid M. The soil pH was measured with a calomel electrode on a paste of In addition to the conspicuous change in temperature along altitudinal gradients in mountainous ecosystems, the physical, chemical and biological properties of soils also change significantly 42 , Reprints and permissions. In addition, shrublands dominated by Rosa bella Rehd. Results Spatial patterns of soil moisture, temperature, and bulk density During the growing season, the average soil moisture content varied at different slope positions. 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?

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.

Initially, soil erosion may reduce plant production as a result of soil degradation and may decrease soil nutrient levels due to decomposition at eroding sites Stallard ; Harden et al. 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. Competing interests The authors declare that they have no competing interests. This could also be the reason for the relatively high SOC concentrations below 20cm in FL, which used to be frequently submerged under water before abandonment, leading to large SOC storage in subsoil. Glob Change Biol 16 : — Paul et al. The field results of soil surface respiration also suggest that the depositional topsoil SOC is prone to be mineralized and that SOC at this depositional context is stabilized at subsoil depth. View Article Google Scholar 2. For instance, N availability has been widely recognized as influencing the decomposition of SOC 23 , 37 , 45 , whereas K and P availability could also affect forest SOC decomposition 23 , Discussion Effects of soil redistribution on the SOC 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. Provided by the Springer Nature SharedIt content-sharing initiative. And if so, how did this affect results? Wang, W. Glob Chang Biol —