Effects of extreme rainfall frequency on soil organic carbon fractions and carbon pool in a wet meadow on the Qinghai-Tibet Plateau

Wang, Haiyan; Wu, Jiangqi; Li, Guang; Yan, Lijuan; Liu, Shuainan

doi:10.1016/j.ecolind.2022.109853

Cited by 5 publications

(3 citation statements)

References 48 publications

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“…The primary soil types are dark meadow, swamp, and peat soils (Wu et al,2022). In terms of vegetation, the dominant species include Kobresia tibetica, Carex moorcroftii, Kobresia kansuensis, Potentilla discolor, and Equisetum arvense (Wang et al,2023).…”

Section: Site Descriptionmentioning

confidence: 99%

Response of soil nitrogen pool to nitrogen and phosphorus addition in the wet meadow of the Qinghai-Tibet Plateau

LU,

Li,

et al. 2024

Preprint

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Background and aims The soil nitrogen (N) conversion process is an important part of the N cycle in wetland ecosystems, which regulates the content of soil available N and determines the retention status of soil N. N deposition and phosphorus (P) input caused by human activities will change the soil N pool, thereby affecting the soil function and conversion process. However, the responses of soil nitrogen pools to N and P addition in the QTP remain unknown. Methods In this study, an experiment was carried out for two years in wetlands situated on the Qinghai-Tibet Plateau. We analyzed the effects of N and P additions on soil nitrogen pool (i.e., blank control (CK), N addition (15 kg N ha− 1 yr− 1, N15), P addition (15 kg P ha− 1 yr− 1, P15), and NP co-addition (15 kg NP ha− 1 yr− 1, N15P15)), and discussed the main driving factors. Results The results showed that N and P addition significantly increased the contents of total nitrogen (TN) and ammonia nitrogen (NH4+-N) in 0-40cm soil layer, and decreased the contents of soil dissolved organic nitrogen (DON), but had no significant effect on the contents of soil microbial biomass nitrogen (MBN). The nitrate nitrogen (NO3−-N) content decreased under the N15 addition, and the TN storage was the highest under the P15 addition. Under each treatment, the surface soil (0-10cm) was more sensitive to N and P addition, while the deep soil was relatively stable. Redundancy analysis (RDA) showed that soil organic carbon (Explanation = 40.80%), soil density (Explanation = 8.70%), and carbon-to-nitrogen ratio (Explanation = 8.40%) were the main environmental factors affecting the content of each N fraction under the N and P addition. Conclusion N and P addition would affect the stability and transformation of wetland soil nitrogen pool, and the nitrogen transformation process was mainly regulated by soil physicochemical properties.

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Section: Site Descriptionmentioning

confidence: 99%

Response of soil nitrogen pool to nitrogen and phosphorus addition in the wet meadow of the Qinghai-Tibet Plateau

LU,

Li,

et al. 2024

Preprint

Self Cite

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“…In recent decades, increasing temperature and shifting precipitation have challenged the storage of terrestrial SOC. , In natural and anthropogenic wetlands, previous studies have confirmed the loss of SOC due to warming, , which can be attributed to the promotion of microbial mineralization of SOC (e.g., the acceleration of Fe(III) reduction and an increase of the relative abundance of methanogens and decomposition enzymatic activity of SOC). Though growing evidence shows temperature effects negatively impact carbon storage, it is also demonstrated that increasing temperature induces higher primary production of crops, which enhances SOC accrual by more influxes of plant-derived C .…”

Section: Introductionmentioning

confidence: 99%

Long-Term Flooding Mitigates the Linkage between Paddy Soil Organic Carbon Sink and Climate Factors

Dai,

Zhou,

Zhang

et al. 2024

ACS Earth Space Chem.

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Understanding how artificial anaerobic environment (flooding) affects paddy soil ecosystem carbon (C) sequestrating has become imperative in the context of global climate change. However, the specific effects under various types of flooding management remain unclear. Here, we reported the results of 682 paired observations from 166 field experiments across typical riceplanting regions in China with a strong environmental gradient, with flooding effects on soil organic carbon (SOC) remaining relatively consistent. Accordingly, we employed nonmetric multidimensional scaling (NMDS) to categorize annual flooding periods into short (3−5 months) and long term (>5 months). The results showed that long-term flooding (48.52 Mg ha −1 ) had a greater SOC sequestration capacity than short-term flooding (30.43 Mg ha −1 ). Furthermore, the application of structural equation modeling (SEM) revealed that long-term flooding significantly mitigated the impacts of mean annual temperature (MAT) and mean annual precipitation (MAP), reducing them by a substantial 7.73-fold compared to short-term flooding. Briefly, longer submerged environments in long-term flooding mitigated the positive effects of MAT and negative effects of MAP, with the standardized total effects (STEs) of 10.7 and 6.2% (P < 0.05), respectively, which were much smaller than those under short-term flooding (21.3 and 67.8%, P < 0.05, respectively). Our findings highlight that an understanding of the relative contribution of anaerobic environment induced by artificially flooding to SOC in soil ecosystems is critical for guiding management efforts aimed at maintaining ecosystem SOC sequestration under global changes.

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“…The soil organic carbon (SOC) pool in forest soils is crucial for predicting and assessing the carbon sequestration potential of forests. In fact, SOC storage in soil is influenced not only by a variety of factors including vegetation, climate, interaction with soil organisms, soil properties but also topography (Bird et al 2004, Wang et al 2023. Globally, the recent estimate of SOC stocks is approximately 1500 Pg C while, 27 earlier global studies estimated the range within 504 to 3000 Pg C ( Sal plantations/forest is spread Scharlemann et al 2014).…”

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Soil Organic Carbon Stocks along Altitudinal Gradient under Shorea robusta Gaertn. F. Plantations in Darjeeling Himalayas

2024

IJE

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The carbon storage potentiality of forest land use systems has been recognized as a major factor in the recent climate change scenario. The current study was designed to quantify the soil organic carbon (SOC) stocks at three soil depths (0-20 cm, 20-40 cm and 40-60 cm) in Gaertn. f. (Sal) plantations along the elevation gradients of 150-300 m, 300-450 m, 450-600 m and 600-750 m in the Shorea robusta Darjeeling Himalayas. There was an increasing trend of SOC stock along the elevation gradient, reaching the maximum stock ( 67.53 Mg C ha ) -1 at the mid elevational range of 450-600 m at the surface soil layer and the minimum ( at 150-300 m. The highest elevational 26.81Mg C ha ) -1 range (600-750 m) was quantified with significantly lesser SOC stock ( than 450-600 m elevational range. Correlation between 51.01 Mg C ha ) -1 elevation gradient and SOC stock exhibited moderate positive relationship between the two (R = 0.485).

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Effects of extreme rainfall frequency on soil organic carbon fractions and carbon pool in a wet meadow on the Qinghai-Tibet Plateau

Cited by 5 publications

References 48 publications

Response of soil nitrogen pool to nitrogen and phosphorus addition in the wet meadow of the Qinghai-Tibet Plateau

Response of soil nitrogen pool to nitrogen and phosphorus addition in the wet meadow of the Qinghai-Tibet Plateau

Long-Term Flooding Mitigates the Linkage between Paddy Soil Organic Carbon Sink and Climate Factors

Soil Organic Carbon Stocks along Altitudinal Gradient under Shorea robusta Gaertn. F. Plantations in Darjeeling Himalayas

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