Soil organic matter with complex molecular attributes (e.g. recalcitrant SOM, adsorbed SOM, complexed SOM) is characterised by low decomposition rates, high activation …
WhatsApp: +86 18221755073
and more frequent temperature variation are less sensitive to global warming than soils adapted to high temperatures. While soil organic carbon (C) decomposition is generally thought to increase ...
WhatsApp: +86 18221755073
Qinghai-Tibet Plateau grasslands are unique geographical regions and store substantial soil organic matter (SOM) in the soil surface, which make them very sensitive to global climate change. Here, we focused on three main …
WhatsApp: +86 18221755073
Nevertheless, studies have found conflicting results regarding the role of soil organic matter in the activation of PMS. ... decline in the Fe 2 O 3 peaks may be attributed to the oxidative decomposition of Fe 2 O 3 during the composite process due …
WhatsApp: +86 18221755073
With the rapid development of aquaculture, the production of oyster shells has surged, posing a potential threat to the environment. While oyster shell powder is widely recognized for its inherent alkalinity and rich calcium carbonate content, making it a superior soil conditioner, its role in organic solid waste composting remains underexplored. To investigate …
WhatsApp: +86 18221755073
Intrinsic temperature sensitivity of soil organic carbon (SOC) pools is the inherent response of their decomposition rate to temperature. ... (1), it is clearly implied that recalcitrant SOC pools (passive SOC pools) are characterized by low decomposition rate, high activation energy and high intrinsic temperature sensitivity. The activation ...
WhatsApp: +86 18221755073
We assessed the impacts of 13 C-labeled maize (Zea mays) straw on SOM mineralization in two soils with contrasting soil C content (3.0 % and 6.8 %) under two …
WhatsApp: +86 18221755073
DOI: 10.1016/j.geoderma.2024.116802 Corpus ID: 267484795; Straw addition and low soil moisture decreased temperature sensitivity and activation energy of soil organic matter @article{He2024StrawAA, title={Straw addition and low soil moisture decreased temperature sensitivity and activation energy of soil organic matter}, author={Peng He and Lu-Jun Li and …
WhatsApp: +86 18221755073
In humid, subtropical and tropical regions of the world, soils are developed under intensive weathering as a result of high temperatures, intensive rainfall and leaching conditions (Qafoku et al., 2004, Xu et al., 2016). ... The effects of soil organic matter on soil Al activation.
WhatsApp: +86 18221755073
The effect of temperature on soil bio decomposition impacts on global warming too. The rate at which soil organic matter, SOM, is decomposed is temperature dependent and a source of greenhouse gases to the atmosphere (Brinkman and Sombroek, 1996). The high multidisciplinary nature of this subject makes this research complex and limits the ...
WhatsApp: +86 18221755073
The macromolecular theory describes that Q 10 is high at low temperatures than high temperatures because the activation energy of enzyme-catalyzed reactions is temperature-dependent due to the large negative change in heat capacity associated with the reactions (Schipper et al., 2014). Thus, the increase of SOC mineralization from high to low ...
WhatsApp: +86 18221755073
To test our hypothesis we collected soil from the Tibetan Plateau and incubated the samples for one month over a temperature range of 0–40 °C (with 5 °C steps) and determined the kinetics, temperature sensitivities and activation energy of six enzymes involved in decomposition of soil organics: cellobiohydrolase and β-glucosidase, which ...
WhatsApp: +86 18221755073
We have a long-standing conceptual framework for how soil organic matter and mineral particles coalesce into aggregates (Denef et al., 2002, Denef and Six, 2005, Six et al., 2004, Tisdall and Oades, 1982).Organic molecules bound to silt and clay particles (mineral-associated organic matter, MAOM) serve as building blocks in the formation of microaggregate …
WhatsApp: +86 18221755073
The method involves using a high-temperature heater to oxidize soil organic carbon into carbon dioxide. ... This instrument oxidizes the organic carbon in the soil at temperatures around 1000 °C, converting it into CO 2. By measuring the total amount of generated carbon dioxide, it determines the organic carbon content in the soil.
WhatsApp: +86 18221755073
The soils, Luvisols in the FAO soil classification, was air-dried, physically cleaned of plant debris, sieved through 4 mm, and mixed thoroughly. The soil contained 15.41 mg organic C g −1 soil and the δ 13 C value of the SOC was −14.29 ‰ with a total N …
WhatsApp: +86 18221755073
Considerable research has shown that modifications in global temperature regimes can lead to changes in the interactions between soil respiration and the sequestration of C and N into soil …
WhatsApp: +86 18221755073
However, high-temperature pyrolysis can prolong the aging time of biochar in soil (Wang et al., 2016; Weber and Quicker, 2018). Furthermore, above a critical activation temperature of 700 °C, −OH radicals and steam can reactivate the biochar and increase its reactivity (Singh et al., 2022; Zhao et al., 2018).
WhatsApp: +86 18221755073
While soil organic carbon (C) decomposition is generally thought to increase with temperature 1,2, recent studies have postulated that this may be a temporary effect, potentially mitigating the expected soil C losses due to climate change 3,4,5.. "Thermal adaptation" has been defined as an adaptation of microbial heterotrophic activity, e.g. by a decrease in heterotrophic …
WhatsApp: +86 18221755073
Temperature sensitivity (Q 10) and activation energy (Ea) of soil organic carbon mineralization in bulk soil and soil aggregates as affected by 44 years of fertilisation under a …
WhatsApp: +86 18221755073
Temperature sensitivity (Q 10) of SOC decomposition indicates the response to a temperature increase of 10 °C (Rey et al., 2005).It is a critical parameter in soil carbon (C) and nitrogen (N) dynamics models and earth system models, helping assess the feedback between global warming and terrestrial CO 2 emissions (Oikawa et al., 2014).The Q 10 has large spatial-temporal …
WhatsApp: +86 18221755073
The indirect TD experimental system (Fig. 1) consisted of carrier gas (N 2, a noble gas), high-temperature and high-pressure lab quartz horizontal tubular furnace (BLMT-GA-10-6-20, Braveman, China) with the working zone length to diameter ratio of approximately 3:1 that quite fits within the range from 2:1 to 10:1 for full-scale rotary drum ...
WhatsApp: +86 18221755073
Request PDF | On Feb 2, 2024, Peng He and others published Straw addition and low soil moisture decreased temperature sensitivity and activation energy of soil organic matter | Find, read and cite ...
WhatsApp: +86 18221755073
A high temperature sensitivity of microbial respiration is linked to parameters independent of chemical oxidizability, in our case, organic matter C/N ratio and soil pH.
WhatsApp: +86 18221755073
The regulation of Rs by biochar is influenced by many factors, such as the material of biochar, pyrolysis temperature, physicochemical properties, etc. and the type of soil, the rate of biochar addition and duration of the experiment, as well as soil temperature and soil moisture content (Xu et al., 2020).On the one hand, the well-developed pore structure and huge …
WhatsApp: +86 18221755073
Soil organic matter (SOM) is a major source of ... organic matter than that of labile substrates (Dai et al., 2017). The activation energy theory regarding the temperature sensitivity of gaseous C emissions suggests that recalcitrant organic ... High temperature increased the CO 2 emission from soil by accelerating acetate and SOM consumption ...
WhatsApp: +86 18221755073
a is the required activation energy in joules per mole; R= 8.314 J K−1 mol−1 gas constant and T is the temperature. Soil organic matter with complex molecular attributes (e.g. recalcitrant SOM, adsorbed SOM, complexed SOM) is characterised by low decomposition rates, high activation energies and, therefore, an 'inherently' high temperature
WhatsApp: +86 18221755073
It has been reported soil components such as Fe/Mn minerals and soil organic matter affect the oxidation of pollutants in soil with the oxidant activation process [36]. The contents of soil organic matter (SOM) in Yingtan, Xuancheng and Hailun soil were 10.11, 21.88 and 54.71 g/kg, respectively, which was opposite to the trend of PHE ...
WhatsApp: +86 18221755073
where k is the reaction rate constant; A is the frequency factor; E a is the required activation energy in joules per mole; R = 8.314 J K −1 mol −1 gas constant and T is the temperature.. Soil organic matter with complex molecular attributes (e.g. recalcitrant SOM, adsorbed SOM, complexed SOM) is characterised by low decomposition rates, high activation …
WhatsApp: +86 18221755073
high activation energies (i.e., slow rates) will experience greater proportional increases with increasing tempera-ture than will those with low activation energy (i.e., fast rates). While this component of kinetic theory could inform our understanding of the longer-term response of decomposition to temperature, its applicability to soil
WhatsApp: +86 18221755073
After high-temperature treatment, the Al coordination structure of montmorillonite was transformed from six-coordination to four-coordination. ... Soil acidification accelerated the weathering of soil clay minerals and the activation of soil solid Al. ... Hong ZN, Xu RK (2022) Aluminum mobilization as influenced by soil organic matter during ...
WhatsApp: +86 18221755073
Soil temperature is the function of heat flux in the soil as well as heat exchanges between the soil and atmosphere Elias et al. 5 It is also defined as the function of the internal energy of the soil (Ghali 2003). The transfer of heat in the soil Zhao et al. 6 and the latent heat exchanges at the surface Nwankwo et al. 7 are the primary causes of variations in soil …
WhatsApp: +86 18221755073