Soil respiration soc

Ecological Processes soil respiration soc 8Article 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, 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 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. Despite higher soil respiration in woodlands, SOC storage and residence time increased in the upper 20 cm of soil.

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.

Soil Biol Biochem 36 : — View Article Google Scholar 5.

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. Changes in soil organic carbon SOC stability may alter carbon release from the soil and, consequently, atmospheric CO 2 concentration.

Soil respiration is the primary path by which CO 2 fixed by land plants returns to the atmosphere. The objective of this paper is to provide a brief scientific review for policymakers who are concerned that changes in soil respiration may contribute to the rise in CO 2 in Earth's atmosphere. Rising concentrations of CO 2 in the atmosphere will increase the flux of CO 2 from soils, while simultaneously leaving a greater store of carbon in the soil. Traditional tillage cultivation and rising temperature increase the flux of CO 2 from soils without increasing the stock of soil organic matter. Increasing deposition of nitrogen from the atmosphere may lead to the sequestration of carbon in vegetation and soils. The response of the land biosphere to simultaneous changes in all of these factors is unknown, but a large increase in the soil carbon pool seems unlikely to moderate the rise in atmospheric CO 2 during the next century. This is a preview of subscription content, log in via an institution to check access. Rent this article via DeepDyve. Institutional subscriptions.

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 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. Despite higher soil respiration in woodlands, SOC storage and residence time increased in the upper 20 cm of soil.

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Garcia-Pausas, J. Field replicates were homogenized and stored air-dried until incubation began. CRC Press We collected soil cores at four topographic positions summit A1, convex shoulder A2, backslope A3 and footslope A4 along a hillslope Fig. The factors included the environmental temperature represented as the MAT; the relevant soil characteristics e. Nature : — These keywords were added by machine and not by the authors. Full size image. Table 1 summarizes the characteristics and species composition of each vegetation type. Furthermore, the currently available studies were mainly conducted in China's southern tropical and sub-tropical areas [35] , [36] , [37] , [38] , [39] , [40]. In addition, shrublands dominated by Rosa bella Rehd. The herbaceous layer of Solitary rose consists of Leymus chinensis Trin. Scharnagl, B. The proportion of light fraction carbon in the total SOC ranged from

Forest Ecosystems volume 6 , Article number: 1 Cite this article.

Soil erosion and the subsequent transport of sediments by rivers represent a key pathway for soil carbon lateral transfer at the land surface, which has a profound effect on the carbon budget of terrestrial ecosystems Ludwig et al. Download references. Z Pflanzenernaehr Bodenkd — Journal Article. 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. In this study, we compared SOC sequestration and soil respiration of paddy rice croplands and two tree plantations afforested on previous paddy fields on the Chongming Island, subtropical China. The annual decomposition rate of litter was lowest at site C and highest at site A. Altitudinal changes in carbon storage of temperate forests on Mt Changbai, Northeast China. Conclusions The findings from this study support that a majority of the SOC at footslope is stored within most of the soil profile i. In the depositional topsoil, the input of labile materials plays a promotional role in soil respiration. ADS Google Scholar.