Trade-off between microbial carbon use efficiency and microbial phosphorus limitation under salinization in a tidal wetland

Zhai, Zhifeng; Luo, Min; Yang, Yang; Liu, Yuxiu; Chen, Xin; Zhang, Changwei; Huang, Jiafang; Ji, Chen

doi:10.1016/j.catena.2021.105809

Cited by 41 publications

(21 citation statements)

References 48 publications

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“…In this study, aboveground C stocks were tightly related with aboveground biomass and slightly associated with the plant C content, suggesting aboveground biomass was the predominant factor driving aboveground C stocks in degraded and recovering wetlands (Sharma et al, 2020). The prior studies have reported that the shift in aboveground biomass is ascribed to varied biotic and abiotic factors, such as soil water level, salinity, nutrient, and plant photosynthesis (Hayes et al, 2017;Zhai et al, 2022).…”

Section: Impacts Of Wetland Degradation and Restoration On Abovegroun...mentioning

confidence: 58%

Responses of Above- and Belowground Carbon Stocks to Degraded and Recovering Wetlands in the Yellow River Delta

et al. 2022

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Wetlands reserve a large amount of organic carbon (C), playing a key role in contributing global C stocks. It is still uncertain to evaluate wetland C stocks due to wetland disturbance or degradation. In this study, we performed the degraded and recovering wetlands to estimate aboveground C stocks and soil organic C (SOC) stocks at the depth of 1 m in the Yellow River Delta. Our results showed that the recovering wetland sequestered 1.67 Mg C ha–1 aboveground, approximately three times higher than those (0.56 Mg C ha–1) of degraded wetland, and recovering wetland stored more SOC of 51.86 Mg C ha–1 in the top 1 m soils, approximately two times higher than those (26.94 Mg C ha–1) of degraded wetland. These findings indicate that the transformation between degraded and recovering wetlands is associated with the conversion of wetland C sources and sinks. The shifts in aboveground C stocks and SOC stocks were mainly attributed to changed biotic (i.e., aboveground biomass and photosynthetic C) and abiotic (i.e., soil water, salinity, SOC and N contents, and SOC compounds) factors. The improved soil water, salinity, and nutrient enhance C reservoir, sequestering more C in aboveground vegetation and storing more SOC via photosynthetic C input of plant litter and root exudates in recovering wetland than in degraded wetland with poor soil conditions. The relationships among wetland C stocks, plant, and soil properties indicate plant-soil interaction driving wetland ecosystem C stocks in degraded and recovering wetlands. Our research suggests that wetland restoration highlights a positive response to “carbon neutrality” by efficiently sequestering C above- and belowground.

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Section: Impacts Of Wetland Degradation and Restoration On Abovegroun...mentioning

confidence: 58%

Responses of Above- and Belowground Carbon Stocks to Degraded and Recovering Wetlands in the Yellow River Delta

et al. 2022

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“…However, there are other patterns of nutrient limitations found such as in some sediments and wetlands. For example, the sediments of mangroves ( Luo and Gu, 2018 ) and tidal wetlands ( Zhai et al, 2022 ) are characterized by P limitation. The great rivers of the Upper Mississippi River basin ( Hill et al, 2009 ) and the lakes in the Yangtze–Huaihe River basin ( Supplementary Table 2 ) showed shifts in N and P limitations of sediment across sites.…”

Section: Discussionmentioning

confidence: 99%

Extracellular enzyme stoichiometry reveals carbon and nitrogen limitations closely linked to bacterial communities in China’s largest saline lake

et al. 2022

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Saline lakes possess substantial carbon storage and play essential roles in global carbon cycling. Benthic microorganisms mine and decompose sediment organic matter via extracellular enzymes to acquire limiting nutrients and thus meet their element budgets, which ultimately causes variations in sediment carbon storage. However, current knowledge about microbial nutrient limitation and the associated organic carbon changes especially in saline lake remains elusive. Therefore, we took Qinghai Lake, the largest saline lake of China, as an example to identify the patterns and drivers of microbial metabolic limitations quantified by the vector analyses of extracellular enzyme stoichiometry. Benthic microorganisms were dominantly colimited by carbon (C) and nitrogen (N). Such microbial C limitation was aggravated upon the increases in water salinity and sediment total phosphorus, which suggests that sediment C loss would be elevated when the lake water is concentrated (increasing salinity) and phosphorus becomes enriched under climate change and nutrient pollution, respectively. Microbial N limitation was predominantly intensified by water total nitrogen and inhibited by C limitation. Among the microbial drivers of extracellular enzyme investments, bacterial community structure consistently exerted significant effects on the C, N, and P cycles and microbial C and N limitations, while fungi only altered the P cycle through species richness. These findings advance our knowledge of microbial metabolic limitation in saline lakes, which will provide insights towards a better understanding of global sediment C storage dynamics under climate warming and intensified human activity.

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“…This decrease indicated a risk of P limitation via plant biomass removal in HDM soils. Similarly, Shang et al (2016), Teng et al (2020) and Zhai et al (2022) revealed that P limited plant growth in degraded alpine meadow and saline wetland ecosystems.…”

Section: Marsh Degradation Alters Soil Phosphorus Availabilitymentioning

confidence: 91%

“…soluble phosphate) that can be transformed into other P forms and then back again via biological or geochemical processes (Gao et al, 2019;Hu et al, 2022;Vitousek et al, 2010). Moreover, soil P transformation is strongly linked to carbon (C) cycles via the effect of the microbial community (Luo et al, 2021;Wang et al, 2021a;Zhai et al, 2022). The concentrations of P and the composition of P forms ultimately affect wetland ecological functions such as water conservation, CO 2 fixation, and climate regulation and health (Bai et al, 2020;Cui et al, 2019a;Liu et al, 2020;Sorrell et al, 2011).…”

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confidence: 99%

Transformation of phosphorus forms and its regulation on phosphorus availability across differently degraded marsh soils

Zhang

Luo

et al. 2022

Preprint

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Soil phosphorus (P) is an essential nutrient that controls wetland productivity and ecological functions. However, the effects of soil P forms on P availability during wetland degradation are relatively unknown. Soil samples from differently degraded marshes, including relatively pristine marsh (RPM), lightly degraded marsh (LDM), moderately degraded marsh (MDM), and heavily degraded marsh (HDM), were collected to investigate the changes in soil P forms and its regulation on P availability in the Zoige Plateau, China. We observed that compared with RPM, the main changes in total P concentration were a significant increase of 31.6%–44.2% in the 0–30 cm soil layers of LDM and MDM, and the available P concentration increased in LDM and MDM but decreased in HDM with a lower P activation coefficient. Marsh degradation increased the concentration and proportion of dicalcium phosphates, P occluded in iron hydroxides, and organic P but decreased those of iron oxide surfaces adsorbed P and apatite P. Soil available P was mainly related to organic P and P non-occluded in iron oxide minerals that might also be non-negligible direct source of available P. The transformation from apatite P to organic P was an important regulation mechanism of P availability in soils during marsh degradation. This study revealed the risk of P limitation in heavily degraded marsh soils and established the mechanism by which marsh degradation significantly influences soil P availability. Therefore, some measure of on improving P availability should be implement for the ecological restoration of heavily degraded marsh in the future, such as grazing exclusion and the application of organic fertiliser.

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Trade-off between microbial carbon use efficiency and microbial phosphorus limitation under salinization in a tidal wetland

Cited by 41 publications

References 48 publications

Responses of Above- and Belowground Carbon Stocks to Degraded and Recovering Wetlands in the Yellow River Delta

Responses of Above- and Belowground Carbon Stocks to Degraded and Recovering Wetlands in the Yellow River Delta

Extracellular enzyme stoichiometry reveals carbon and nitrogen limitations closely linked to bacterial communities in China’s largest saline lake

Transformation of phosphorus forms and its regulation on phosphorus availability across differently degraded marsh soils

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