Assessment of long-term phosphorus budget changes influenced by anthropogenic factors in a coastal catchment of Osaka Bay

Wang, Kunyang; Onodera, Satoshi; Saito, Mitsuyo; Ishida, Takuya

doi:10.1016/j.scitotenv.2022.156833

Cited by 13 publications

(9 citation statements)

References 47 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The P concentrations at our site exceeded these values (Table ). The P fertilization in Japan has been applied at the highest levels worldwide because of the low P use efficiency, and a large surplus of P has been generated. − The high P accumulation and PSR may have occurred because the soil has a high PSC and P fertilizer has been applied above the rate of P leaching.…”

Section: Discussionmentioning

confidence: 99%

“…The study site was a small island in the temperate zone of Japan, where intensive citrus cultivation in clay soil (light clay) has been practiced since 1900. In Japan, P fertilization has been utilized at the highest levels globally because of the low P use efficiency. − There was little evidence of whether P could reach the groundwater table in clay soils with high PSC. ,, The groundwater at the study site has been heavily affected by the application of nitrogen fertilizer . In this small catchment with simple land usage, legacy P leaching into groundwater can be effectively examined by δ 18 O PO4 analysis and PSR because the groundwater is less influenced by anthropogenic factors other than legacy P.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Evaluation of Phosphorus Enrichment in Groundwater by Legacy Phosphorus in Orchard Soils with High Phosphorus Adsorption Capacity Using Phosphate Oxygen Isotope Analysis

Ishida,

Tamura,

Kimbi

et al. 2024

Environ. Sci. Technol.

Self Cite

View full text Add to dashboard Cite

Long-term phosphorus (P) fertilization results in P accumulation in agricultural soil and increases the risk of P leaching into water bodies. However, evaluating P leaching into groundwater is challenging, especially in clay soil with a high P sorption capacity. This study examined whether the combination of PO 4 oxygen isotope (δ 18 O PO4 ) analysis and the P saturation ratio (PSR) was useful to identify P enrichment mechanisms in groundwater. We investigated the groundwater and possible P sources in Kubi, western Japan, with intensive citrus cultivation. Shallow groundwater had oxic conditions with high PO 4 concentrations, and orchard soil P accumulation was high compared with forest soil. Although the soil had a high P sorption capacity, the PSR was above the threshold, indicating a high risk of P leaching from the surface orchard soil. The shallow groundwater δ 18 O PO4 values were higher than the expected isotopic equilibrium with pyrophosphatase. The high PSR and δ 18 O PO4 orchard soil values indicated that P leaching from orchard soil was the major P enrichment mechanism. The Bayesian mixing model estimated that 76.6% of the P supplied from the orchard soil was recycled by microorganisms. This demonstrates the utility of δ 18 O PO4 and the PSR to evaluate the P source and biological recycling in groundwater.

show abstract

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Evaluation of Phosphorus Enrichment in Groundwater by Legacy Phosphorus in Orchard Soils with High Phosphorus Adsorption Capacity Using Phosphate Oxygen Isotope Analysis

Ishida,

Tamura,

Kimbi

et al. 2024

Environ. Sci. Technol.

Self Cite

View full text Add to dashboard Cite

show abstract

“…The phosphorus in soil plays an important role in plant growth and development, which is related to plant energy biochemical reactions, and is essential for plant cell division and meristem development [50,51]. There are many factors affecting phosphorus loss, such as migration and transformation mechanisms under hydrothermal transport, leaching, volatilization, and surface runoff [52]. The phosphorus loss in runoff communities is shown in Figure 5, and the phosphorus loss in each runoff area shows an upward trend with the increase in precipitation.…”

Section: Nitrogen and Phosphorus Loss Effects In Runoff Communitiesmentioning

confidence: 99%

Study on the Mechanism of Rainfall-Runoff Induced Nitrogen and Phosphorus Loss in Hilly Slopes of Black Soil Area, China

Li,

Ma,

Wang

et al. 2023

Water

View full text Add to dashboard Cite

In order to identify the effects of the slope and precipitation intensity on the soil runoff depth and runoff rate, different tillage patterns (slope-ridge direction, horizontal slope-ridge direction, no-ridge farming) and different slopes (3° and 5°) were set up, and five typical rainfalls from June to September 2021 were selected, to dynamically monitor the soil-erosion dynamics of the test plots under different rainfall intensities. The results show that cross-slope-ridge cropping has a retention effect on runoff, which effectively inhibits the ineffective loss of rainfall confluence. Among these results, the variation range in the soil runoff depth under cross-slope-ridge treatment conditions was 0.11~0.94 mm, while that under the slope-ridge treatment and no-ridge treatment conditions was increased to 1.44~12.49 mm and 3.45~14.96 mm, respectively. It found that the loss of soil nutrients was significantly higher in the slope-ridge direction and in the no-ridge farming condition than in the horizontal slope-ridge direction. It is worth noting that, as the slope of the cultivated land increases, the erosive capacity of the precipitation runoff for the soil phosphorus increases, while the carrying capacity of the soil nitrogen decreases, and the correlation analysis results confirm that the corresponding relationship between the free diffusion capacity of the soil ammonium nitrogen and soil erosion is weaker than that between the nitrate nitrogen and soil erosion. The effects of single factors, such as the slope, ridge direction, and precipitation intensity of the cultivated land, have a significant impact on the soil water- and fertilizer-loss process, while the influence effect of the multi-factor coupling process on soil erosion is weakened. It was confirmed that the erosion process of rainfall runoff on soil nitrogen and phosphorus loss in slope cultivated land is the result of multi-factor action, and the artificial modification of the tillage mode can effectively regulate the effect of farmland water and fertilizer loss.

show abstract

“…Currently, big data has become an important national strategic resource. The 14th Five Year Plan proposes to implement the national big data strategy, promote open sharing of data resources, unleash technological, institutional, and innovation dividends, and promote economic transformation and upgrading [2][3] . The Guiding Opinions on Promoting the Development of Big Data in Climate Resources issued by the Ministry of Climate Resources in 2018 proposed to accelerate data integration, sharing, and orderly opening, promote the deep integration of climate conservancy business and information technology, deepen the innovative application of big data in climate conservancy work, and promote the modernization of climate governance system and governance capacity.…”

Section: Introductionmentioning

confidence: 99%

Research on a global periodic climate prediction method based on improved BP neural network

2024

TNS

View full text Add to dashboard Cite

Climate prediction has a wide social demand, but due to the complexity of climate system formation and the uniqueness of Chinas terrain, accurate prediction is extremely complex and difficult. Therefore, this article proposes a global periodic climate prediction method based on an improved BP neural network. Firstly, based on historical meteorological data, establish a climate model and summarize and analyze the characteristics of the patterns; Then, based on the BP neural network, considering the relationship between adjacent days, rolling sampling of historical data is carried out according to seasonal and meteorological factors in the sampling interval, establishing a multi-state transition probability matrix, and constructing an annual time series forecasting model; Finally, taking precipitation prediction as an example, an example was used to simulate the annual precipitation situation. The calculation results have verified the effectiveness of the proposed method, indicating that it can simulate climate conditions well and provide guidance for climate governance and engineering construction.

show abstract

Assessment of long-term phosphorus budget changes influenced by anthropogenic factors in a coastal catchment of Osaka Bay

Cited by 13 publications

References 47 publications

Evaluation of Phosphorus Enrichment in Groundwater by Legacy Phosphorus in Orchard Soils with High Phosphorus Adsorption Capacity Using Phosphate Oxygen Isotope Analysis

Evaluation of Phosphorus Enrichment in Groundwater by Legacy Phosphorus in Orchard Soils with High Phosphorus Adsorption Capacity Using Phosphate Oxygen Isotope Analysis

Study on the Mechanism of Rainfall-Runoff Induced Nitrogen and Phosphorus Loss in Hilly Slopes of Black Soil Area, China

Research on a global periodic climate prediction method based on improved BP neural network

Contact Info

Product

Resources

About