Phosphorus biogeochemistry regulated by carbonates in soil

Geng, Ying; Pan, Shang; Zhang, Lin; He, Kun; Gao, Hongjian; Li, Zhen; Tian, Dacheng

doi:10.1016/j.envres.2022.113894

Cited by 26 publications

(7 citation statements)

References 159 publications

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“…Declining TP trends (cluster 2) have a larger chance to occur in watersheds with a large Carb_pct (figure 3). One likely explanation is the reduction of P availability and export in the carbonate terrain due to the precipitation of phosphate [42] and less accumulation of legacy P in agricultural fields [38]. In our prior work on TN trends [8], a similar effect of Carb_pct was noted, which was attributed to the relatively quick infiltration and groundwater transport of N in this terrain [26].…”

Section: Effects Of Watershed Physical Propertiesmentioning

confidence: 71%

Effects of point and nonpoint source controls on total phosphorus load trends across the Chesapeake Bay watershed, USA

Zhang,

Bostic,

Sabo

2023

Environ. Res. Lett.

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Reduction of total phosphorus (TP) loads has long been a management focus of Chesapeake Bay restoration, but riverine monitoring stations have shown mixed temporal trends. To better understand the regional patterns and drivers of TP trends across the Bay watershed, we compiled and analyzed TP load data from 90 Non-Tidal Network stations using clustering and random forest (RF) approaches. These stations were categorized into two distinct clusters of short-term (2013-2020) TP load trends, i.e., monotonic increase (n = 35) and monotonic decline (n = 55). RF models were developed to identify likely regional drivers of TP trend clusters. Reductions in point sources and agricultural nonpoint sources (i.e., fertilizer) both contributed to water-quality improvement in our period of analysis, thereby demonstrating the effectiveness of nutrient management and the importance of continuing such efforts. In addition, declining TP trends have a larger chance to occur in carbonate areas but a smaller chance in Coastal Plain areas, with the latter likely reflecting the effect of legacy P. To provide spatially explicit information, TP trend clusters were predicted for the entire watershed at the scale of river segments, which are more directly relevant to watershed planning. Among the 975 river segments, 544 (56%) and 431 (44%) were classified as “monotonic increase” and “monotonic decrease”, respectively. Furthermore, these predicted TP trend clusters were paired with our previously published total nitrogen (TN) trend clusters, showing that TP and TN both declined in 185 segments (19%) and neither declined in 337 segments (35%). Broadly speaking, large-scale nutrient reduction efforts are underway in many regions to curb eutrophication. Water-quality responses and drivers may differ among systems, but our work provides important new evidence on the effectiveness of management efforts toward controlling point and nonpoint sources.

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Section: Effects Of Watershed Physical Propertiesmentioning

confidence: 71%

Effects of point and nonpoint source controls on total phosphorus load trends across the Chesapeake Bay watershed, USA

Zhang,

Bostic,

Sabo

2023

Environ. Res. Lett.

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“…In this study, the presence of beneficial saprophytic fungi and increased negative inter-kingdom correlations between bacteria and fungi in coconut peat substrates seem to facilitate the shift towards a “bacterial-type” community. This shift potentially enhances the plant’s resistance to pathogenic fungal attacks [ 249 ].…”

Section: Discussionmentioning

confidence: 99%

Exploring the Impact of Coconut Peat and Vermiculite on the Rhizosphere Microbiome of Pre-Basic Seed Potatoes under Soilless Cultivation Conditions

Yan,

Ma,

Bao

et al. 2024

Microorganisms

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Soilless cultivation of potatoes often utilizes organic coconut peat and inorganic vermiculite as growing substrates. The unique microbial communities and physicochemical characteristics inherent to each substrate significantly influence the microecological environment crucial for potato growth and breeding. This study analyzed environmental factors within each substrate and employed Illumina sequencing alongside bioinformatics tools to examine microbial community structures, their correlation with environmental factors, core microbial functions, and the dynamics of microbial networks across various samples. These included pure coconut peat (CP1) and pure vermiculite (V1), substrates mixed with organic fertilizer for three days (CP2 and V2), and three combinations cultivated with potatoes for 50 days (CP3, V3, and CV3—a 1:1 mix of coconut peat and vermiculite with organic fertilizer). Vermiculite naturally hosts a more diverse microbial community. After mixing with fertilizer and composting for 3 days, and 50 days of potato cultivation, fungal diversity decreased in both substrates. Coconut peat maintains higher bacterial diversity and richness compared to vermiculite, harboring more beneficial bacteria and fungi, resulting in a more complex microbial network. However, vermiculite shows lower bacterial diversity and richness, with an accumulation of pathogenic microorganisms. Among the 11 environmental factors tested, water-soluble nitrogen (WSN), total nitrogen (TN), available potassium (AK), total organic carbon (TOC) and air-filled porosity (AFP) were significantly associated with microbial succession in the substrate.The nutritional type composition and interaction patterns of indigenous microorganisms differ between vermiculite and coconut peat. Adding abundant nutrients significantly affects the stability and interaction of the entire microbial community, even post-potato cultivation. When using vermiculite for soilless cultivation, precise control and adjustment of nutrient addition quantity and frequency are essential.

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“…The groups detected between 1000-1500 cm − 1 relate to the presence of the carbonate content of the soil, where there is a signi cant increase in the absorbances after enrichment. This is attributed to the enrichment added which increased carbonate in calcite and the minerals present in calcite and dolomite of the soil (Geng et al, 2022). Soil nitrates along with some halogen compounds (such as chlorides and bromides) are detected at the absorbance range of 2500-3500 cm − 1 .…”

Section: Functional Groups and Bioremediationmentioning

confidence: 99%

Bioelectricity production and bioremediation potential of Withania somnifera in plant microbial fuel cells with food wastes as enrichment

Bhattacharya

Bose

Ganti

et al. 2023

Preprint

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In plant microbial fuel cells or p-MFCs living plants photosynthesize between two electrodes. The plant exudes organic waste material from the roots. In the rhizosphere, bacteria consume these wastes by oxidizing them in contrast to the atmosphere that reduces it. This redox reaction along with photosynthesis can be harnessed as an energy source in the form of bioelectricity. In this work, the plant Withania somnifera (L.) Dunal was used for generating bioelectricity from the root exudates and organic matter available in the soil. An open circuit voltage of 930 ± 21 mV was achieved between multiple cycles of operation. The cell voltage further increased to 1260 ± 140 mV with enrichment in the form of discards from vegetable matter. The peak recorded voltage was 1400 mV. Graphite fibre felt electrodes ensured uniform microbial growth with power densities that were achieved at 57 mW/m2 and 84 mW/m2 with and without enrichment respectively. ATR-FTIR demonstrated complete degradation of specific compounds attached to the carbon matrix in the soil along with the polysaccharide content from the enrichments. Additionally, this work also monitored the changes in soil pH and its homogeneity, the impact of photosynthetically active radiation, humidity, and the presence of CO2 in the air, and how it affects plant growth and ultimately the microbes at the rhizosphere which accounted for the bioremediation and the resultant bioelectricity production. SEM imaging further confirmed the importance of anaerobic environment and electrode properties that allow the growth of conductive biofilms from the electrochemically active microbes present in the soil.

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Phosphorus biogeochemistry regulated by carbonates in soil

Cited by 26 publications

References 159 publications

Effects of point and nonpoint source controls on total phosphorus load trends across the Chesapeake Bay watershed, USA

Effects of point and nonpoint source controls on total phosphorus load trends across the Chesapeake Bay watershed, USA

Exploring the Impact of Coconut Peat and Vermiculite on the Rhizosphere Microbiome of Pre-Basic Seed Potatoes under Soilless Cultivation Conditions

Bioelectricity production and bioremediation potential of Withania somnifera in plant microbial fuel cells with food wastes as enrichment

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