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. Soil respiration soc, 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.

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.

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. 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 during the incubation fitted well to a three-pool labile, intermediate and stable SOC decomposition model. The intermediate carbon pool contributed dominantly to cumulative carbon release. The size of the intermediate pool was strongly related to the percentage of sand particle. The decomposition rate of the intermediate pool was negatively related to soil nitrogen availability. Because both soil texture and nitrogen availability are temperature independent, the stability of SOC was not associated with the MAT, but was heavily influenced by the intrinsic processes of SOC formation and the nutrient status. Khushboo Gurung, Katie J.

The lowest moisture was observed at backslope A3 and the highest moisture at footslope A4 not shown. Table 1 Site descriptions along an altitudinal gradient on the northern slope of Changbai Mountain.

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.

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. Three additional lines of evidence provide support for this finding. By analysing two separate global gross primary production datasets 10 , 11 , we find that the ratios of both R H and R S to gross primary production have increased over time. Similarly, significant increases in R H are observed against the longest available solar-induced chlorophyll fluorescence global dataset, as well as gross primary production computed by an ensemble of global land models.

Soil respiration soc

Forest Ecosystems volume 6 , Article number: 1 Cite this article. Metrics details. Soil organic carbon SOC is a large reservoir of terrestrial carbon C ; it consists of different fractions of varying complexity and stability. Partitioning SOC into different pools of decomposability help better predict the trend of changes in SOC dynamics under climate change.

Blow up palm trees

A carbon decomposition model based on CO 2 release dynamics was developed to evaluate the pool sizes and decomposition rates to differentiate the thermodynamic and kinetic control of SOC decomposition. Soil carbon fractions based on their degree of oxidation and the development of a carbon management index for agricultural systems. Conceived and designed the experiments: WW. Tax calculation will be finalised at checkout Purchases are for personal use only Learn about institutional subscriptions. Soil respiration can indicate soil mineralization through SOC decomposition via microbes and can be affected by numerous factors including, but not excluding, soil temperature, soil moisture, and physical protection within soil aggregates Doetterl et al. Carbone MS, Winston GC, Trumbore SE Soil respiration in perennial grass and shrub ecosystems: linking environmental controls with plant and microbial sources on seasonal and diel timescales. SOC depth distribution a and stocks b as a function of the geomorphic position. Physiological method for quantitative measurement of microbial biomass in soils. The content of soil available K in soils C and D was lower than in the other three soils. Table 1. The soil available P was extracted with 0. Radiocarbon dating of non-hydrolysable carbon indicated that the residue time of this recalcitrant fraction was about thousand years

Ecological Processes volume 8 , Article number: 28 Cite this article. Metrics details.

Oecologia — With higher litter amounts and annual litter decomposition rates, most of the labile material is consumed quickly, leaving behind microbial derived stable compounds and more recalcitrant detritus to soil, which ultimately lead to higher biochemical stability of SOC at lower elevations C0 2 evolution from a soil is thus a measure of the total soil biological activity. The determination of soil C pool sizes and turnover rates: biophysical fractionation and tracers. We hypothesized that 1 soil respiration as well as SOC storage and residence time were higher in woody vegetation types than in grasslands, and 2 vegetation-mediated change in soil microenvironments was a major driver for the variation of soil respiration. The annual net flux of carbon to the atmosphere from changes in land use — View author publications. Close mobile search navigation Article Navigation. Our incubation procedure effectively accounted for these problems Fang and Moncrieff, ; Fang et al. In addition, a previous study showed that CO 2 efflux was also regulated by a complex interplay of different environmental factors, such as soil moisture, soil temperature, and soil porosity Van Hemelryck et al. To understand the relationship between substrate supply and respiratory CO 2 production during SOC decomposition, one assumes that each soil sample contains a number of carbon pools, each of which has a fixed size and a corresponding decomposition rate 24 , 25 , Z Pflanzenernaehr Bodenkd — Publisher Name : Springer, Berlin, Heidelberg.