Soil respiration soc

Ecological Processes volume 8 soil respiration soc, 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.

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. The mean annual temperature MAT can change the soil physico-chemical characteristics and alter the quality and quantity of litter input into the soil that regulate SOC stability. However, the relationship between climate and SOC stability remains unclear.

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. Historically, deforestation has been mainly responsible for a net release of approximately 40—90 pentagrams Pg of C from cultivated soils into the atmosphere Cole et al.

Soil Biol Biochem 40 : — Latest Most Read Most Cited Nitrogen addition increased resident plant community resistance to Solidago canadensis invasion by altering allelopathic effect, soil respiration soc. On the variability of respiration in terrestrial ecosystems: moving beyond Q

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.

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.

Soil respiration soc

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The primary soil type in this area is black soil, according to the Chinese genetic classification. In the incubation experiments, the respiration rates of the topsoil samples 0—10 cm were higher than those of the subsurface soils 10—90 cm Fig. In the depositional topsoil, the input of labile materials plays a promoting role in soil respiration. The cumulative amount of C-CO 2 released was calculated by integrating the soil respiration rate with time. Browse Subject Areas? We confirm that the field studies did not involve endangered or protected species. R s of the plantations was generally higher in summer June—August and lower in winter December—February , with peak values in July and the lowest in February Fig. One might suspect that a longer period e. However, this study revealed that large uncertainties still existed concerning the effects of afforestation on SOC sequestration in China, especially where paddy rice croplands were involved. Naishun Bu. Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.

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The variation in soil respiration among different vegetation types could be well explained by SOC and soil total nitrogen content. This soil biological activity consists of numerous individual activities; the formation of C0 2 is the last step of carbon mineralization. Siberian crabapple and meadow grasslands are also very common Fig. Nature : — These results suggest that the depositional topsoil SOC is prone to be mineralized, and the SOC in this depositional context is stabilized at subsoil depth. Our estimates of annual SR ranged from Labile soil carbon pools in subtropical forest and agricultural ecosystems as influenced by management practices and vegetation types. However, in paired juniper woodland and C 4 -dominated grassland sites, longer woodland topsoil residence time 33 years was observed than in GRs 18 years [58]. Climate Research — Soil temperature at 5-cm depth followed a common seasonal pattern under all land uses, with peak values in June Dynamic root microbiome sustains soybean productivity under unbalanced fertilization Article Open access 23 February