Spatiotemporal dynamics in soil iron affected by wetland conversion on the Sanjiang Plain

Chi, Guangyu; Zhu, Bin; Huang, Bin; Chen, Xin; Yi, Shuai

doi:10.1002/ldr.4069

Cited by 10 publications

(4 citation statements)

References 58 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The driver behind this trend was the change in the crop planting structure, with a decline in dry land and the expansion of paddy fields (Wang et al 2014; Zhang et al 2022). Moreover, it has been previously reported that paddy fields have replaced ∼80% of the wetlands since the 1950 s (Chi et al 2021). Figure 8b shows that cumulative GWSV exhibited a linear downward trend from 2000 to 2017, thereby indicating that groundwater storage presented a long‐term decrease.…”

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Analysis of Groundwater Overexploitation Based on Groundwater Regime Information

Lu³

et al. 2022

Groundwater

View full text Add to dashboard Cite

Although groundwater overexploitation is a global problem, there are no unified standards for its identification and determination. To date, groundwater overexploitation has mainly been evaluated using the groundwater quantity balance and effect of groundwater exploitation on the environment. However, it is difficult to determine groundwater exploitation for an agricultural irrigation area owing to the lack of detailed environmental monitoring data. We used the experience of previous studies to introduce a novel identification model for groundwater overexploitation by relying on groundwater regime information and multi‐factor analysis. The model was applied to the Songhua River‐Naoli River area, Sanjiang Plain (China). In the demonstrated model, the study area was divided in the context of the risk of overexploitation into natural and non‐natural regime areas according to groundwater regime characteristics. The areas were identified by analyzing groundwater flow fields, cones of groundwater depression, and storage variation. The analysis demonstrated that the study area could be divided into high‐risk, medium‐risk, low‐risk, and non‐overexploitation areas with corresponding area ratios of 10.12%, 1.38%, 54.8%, and 33.7%. Moreover, the total amount of overexploited groundwater was estimated to be 30.41 × 108 m3 (average annual decrease = 1.69 × 108 m3). Overall, the proposed identification model was shown to be applicable to agricultural irrigation areas, thereby offering promising implications.

show abstract

Section: Resultsmentioning

confidence: 99%

“…Furthermore, rice is the dominant crop (Song et al 2008; Wang et al 2014) in the Sanjiang Plain. The acreage of paddy fields increased (Chi et al 2021; Zhang et al 2022) over the years, thereby increasing the amount of groundwater exploitation.…”

Section: Resultsmentioning

confidence: 99%

Analysis of Groundwater Overexploitation Based on Groundwater Regime Information

Lu³

et al. 2022

Groundwater

View full text Add to dashboard Cite

show abstract

“…Although only 0.72% water samples had NO 2 − content above the permissible limit, the over-limit ratio of NH 3 -N is up to 25.48%, according to the Chinese drinking water standard. However, groundwater's Fe concentrations in this area reached high levels because of their geochemical nature [54]. Therefore, NO 3 -N and NH 3 -N were identified as the major anthropogenic pollutants in the study area.…”

Section: Groundwater Quality For Drinkingmentioning

confidence: 89%

Hydrochemical Evolution and Quality Assessment of Groundwater in the Sanjiang Plain, China

Zhou

Lü

et al. 2022

Water

View full text Add to dashboard Cite

Groundwater is subjected to contamination threats from human activities, such as agriculture, especially long-term farming in the Sanjiang Plain, China. Identifying the sources and distribution of pollution is essential for its reasonable prevention and control. In this study, we analysed the chemical characteristics of 389 samples at 60 shallow groundwater monitoring points from 2011 to 2015 in the Sanjiang Plain using traditional hydrochemical methods, water quality assessment, Pearson’s correlation, and principal component analysis (PCA). Although groundwater type in this area was predominantly HCO3-Ca·Mg, three forms of nitrogen pollution (ammonia, nitrate, and nitrite) were all detected in this area. The interaction of natural geochemical and anthropogenic factors during hydrochemical formation is confirmed by the high coefficients of variation and Gibbs plots of the main ions in the water. The overall shallow groundwater situation was described as good, with more than 40% and 90% of groundwater samples suitable for drinking and irrigation according to the quality assessment, respectively. The proportion of poor water quality in the wet season was higher than that in the dry season. NO3-N and NH3-N were identified as the major anthropogenic pollutants in the study area. Results from Pearson’s correlation and principal component analysis shows two main pollutants fall into two chemical controlling factors together with natural chemical parameters, which implies that the migration and transformation of pollutants may have affected the overall hydrochemical characteristics of the regional groundwater. Therefore, findings from this paper can provide insight into the chemical evolution of groundwater in response to long-term agricultural activities and can help contribute to better management of groundwater resources and agricultural sustainable development.

show abstract

“…Studies have shown that soil organic matter can promote activation, solubility, and migration of soil Fe through reduction and complexation in an anaerobic environment (Jansen et al, 2003;Giannetta et al, 2020). Chi et al (2021) studied the temporal dynamics in soil Fe affected by wetland conversion on the Sanjiang Plain and the results indicated that soil Fe stock in the 0-120 cm layers gradually increased with increasing planting ages within 18 yr and the decrease in SOC contributed to the changed transportation and dynamics of soil Fe after wetland conversion. In comparison, the acidic environment under an anaerobic condition was conducive to promoting the solubility, mobility, and leaching loss of Fe in the soil (Gotoh and Patrick, 1974;Schwertmann, 1985).…”

Section: Variations and Controls Of Fe Loss During Paddy Soil Evolutionmentioning

confidence: 99%

Iron loss of paddy soil in China and its environmental implications

Chen

Zhao

Han

et al. 2022

Sci. China Earth Sci.

View full text Add to dashboard Cite

Iron (Fe) is an important element for the terrestrial and marine ecosystems through its biogeochemical cycling on the Earth's surface. China has a long rice cultivation history, with extensive rice distribution across many types of paddy soils. Paddy soils are the largest anthropogenic wetlands on earth with critical roles in ecosystem functions. The periodic artificial submergence and drainage during paddy soil evolution result in significant changes in soil moisture regime and redox conditions from the natural soils, which facilitate the increase of Fe solubility and mobilization. However, there is a lack of systematic assessment on the magnitude of the migration and loss amount of Fe from paddy soils. In order to quantify the Fe loss and assess the dynamic evolution of Fe in the soils after rice cultivation, seven paddy soil chronosequences derived from different landscapes (bog, plain, terrace) and parent materials (acidic, neutral, calcareous) with cultivation history from 0 to 2,000 yr were studied. Results showed that the rates and trajectories of Fe evolution showed distinct patterns among the studied seven paddy soil chronosequences. However, net losses of Fe from 1 m soil depth occurred at all studied paddy soil chronosequences regardless of the original landscapes and parent materials. Fe in the paddy soils derived from the calcareous lacustrine sediments in the bog area showed a slight accumulation during the initial stage (50 yr) of paddy cultivation, with a loss rate of 0.026 kg m −2 yr −1 during the 50-to 500-yr time period. For the paddy soils developed on the calcareous marine sediments in the plain area, Fe evolution was dominated by the internal movement in soil profiles through coupled reducing-eluviation reactions in the surface horizons and oxidation-illuviation in the subsurface horizons within 1,000 yr of paddy cultivation, with an averaged net loss rate of 0.029 kg m −2 yr −1 during the 1,000-to 2,000-yr time period of rice cultivation. In contrast, Fe in the paddy soils derived from the acidic and neutral parent materials in the plain and terraced upland areas was rapidly lost during the initial stage of paddy cultivation, with a maximum loss rate of 1.106 kg m −2 yr −1 , while the Fe loss rate decreased gradually with increasing paddy cultivation age. Soil pH, CaCO 3 , and organic matter contents of the original soils, the length of time of paddy cultivation, landscape types and positions, and changes in soil moisture regime and redox condition induced by artificial submergence and drainage were the main factors controlling the rates and trajectories of Fe loss during paddy soils evolution. The amount of Fe loss caused by rice cultivation at the national scale was estimated based on the data collected from this study and the literature. The Fe loss fluxes of paddy soils in China were about 46.4-195.7 Tg yr −1 , and the amounts of Fe losses from paddy fields nationwide were about 5,121.5-9,412.2 Tg. Quantifying Fe loss from paddy fields is important to scientifically assess the impact...

show abstract

Spatiotemporal dynamics in soil iron affected by wetland conversion on the Sanjiang Plain

Cited by 10 publications

References 58 publications

Analysis of Groundwater Overexploitation Based on Groundwater Regime Information

Analysis of Groundwater Overexploitation Based on Groundwater Regime Information

Hydrochemical Evolution and Quality Assessment of Groundwater in the Sanjiang Plain, China

Iron loss of paddy soil in China and its environmental implications

Contact Info

Product

Resources

About