Phytolith content in Vietnamese paddy soils in relation to soil properties

Nguyen, Minh N.; Dultz, Stefan; Meharg, Andrew A.; Pham, Quang Van; Hoang, Anh; Dam, Than T.N.; Nguyen, Van Hai; Nguyen, Kien T.; Nguyen, Huan X.; Nguyen, Nuong Thi Kieu

doi:10.1016/j.geoderma.2018.07.027

Cited by 39 publications

(16 citation statements)

References 47 publications

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“…The fate of phytolith in soil is important because of its effects on agronomical nutrient resources and carbon sequestration (Nguyen et al 2019). Under different environmental conditions, phytolith accumulation is mainly controlled by the return ux of phytolith and the stability of phytolith in soil.…”

Section: Discussionmentioning

confidence: 99%

Phytolith Content In Larix Gmelinii Forest Soils And Its Relations With Soil Properties

Wang

Meng

Zhang

2021

Preprint

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Aims Phytolith occluded carbon (PhytOC) has become one of the important mechanisms of long-term carbon sequestration in soil. Ecosystems with higher latitude in the northern hemisphere are expected to face the largest loss of soil carbon due to global warming. The contributions of phytoliths storage in soil layers of cold temperate forest need to be studied in depth. Methods We examined soil phytolith contents and other soil physicochemical properties of Larix gmelinii forest soils in Daxing’anling. ANOVA was employed to analyze differences in the quantitative characteristics of phytoliths. Bivariate correlation, regression analysis, principal component analysis and redundancy analysis were employed to analyze the relations between soil phytolith and soil properties. Results The phytolith in Larix gmelinii forest soil was mainly in elongate shape with a mean content of 19.1 g kg− 1. The phytolith had a stronger correlation with phosphorus rather than potassium and nitrogen and had no correlation with soil water content, and the dominant factors were Na, Mg and K content. Soil phytolith storage in the cold temperate zone (41.0 t ha− 1) was significantly higher than that in the tropical and subtropical zone. Conclusions Phytolith is an important way for long-term sequestration of soil organic carbon. Soil phytolith storage is affected by soil physicochemical properties and climate. However, the acid-base level of soil is more important for phytolith preservation. The effects of hydrothermal conditions on the yield and stability of phytoliths on a large spatial scale need to be studied in future.

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Section: Discussionmentioning

confidence: 99%

Phytolith Content In Larix Gmelinii Forest Soils And Its Relations With Soil Properties

Wang

Meng

Zhang

2021

Preprint

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“…Theoretically, LFOM-phytolith is temporarily trapped in the litter and is sensitive to forest management practices. Once the LFOM decomposes, the PhytOC is released into the soil and may form HFOM-PhytOC, including PhytOC protected by clay [31]. However, there has been little study on the effect of intensive management on PhytOC distribution in physical fractions of soil.…”

Section: Of 15mentioning

confidence: 99%

Intensive Management Increases Phytolith-Occluded Carbon Sequestration in Moso Bamboo Plantations in Subtropical China

Huang

et al. 2019

Forests

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Plantation management practices could markedly change the sequestration of phytolith-occluded carbon (PhytOC) in plants and soils. However, for Moso bamboo (Phyllostachys pubescens) plantations, the effect of intensive plantation management (including fertilization, tillage, and removal of understory vegetation) on the accretion rate of PhytOC in the soil-plant system is much less understood than extensive management (without fertilization, tillage, and removal of understory vegetation). The objectives of this study were to investigate the effect of intensive and extensive management practices on the production, accumulation, and runoff of PhytOC and their distribution in physical fractions in Moso bamboo plantations. Our results showed that intensive management (1) increased PhytOC production mainly due to increased forest productivity; (2) increased PhytOC storage in the heavy fraction but decreased its storage in the light fraction of organic matter, resulting in the lack of effect on soil PhytOC storage; (3) increased the rate of dissolution of phytolith and the loss of PhytOC in runoff; and (4) promoted PhytOC sequestration in the soil-plant system, mostly in the plants, due to the greater rate of PhytOC production than the rate of loss. We conclude that intensive bamboo plantation management practices are beneficial to increasing long-term PhytOC sequestration in the soil-plant system.

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“…Phytolith is formed due to the deposition of silicic acid in inter-and intracellular space throughout the rice plant body (Zhang et al 2013;Nguyen et al 2014). Recently, phytolith has received extensive attention in climate research and agro-environmental sciences because of its ability to store/encapsulate organic carbon Sun et al 2017;Nguyen et al 2019) and nutrients (Nguyen et al 2015;Trinh et al 2017) in its structure. However, it remains controversial regarding the fate of phytoliths, e.g., highly soluble or highly recalcitrant (Kögel-Knabner et al 2010) and their role in sequestering organic matter (Song et al 2016; Santos and Alexandre 2017).…”

Section: Introductionmentioning

confidence: 99%

“…Contrasting observations on dissolution properties have been reported in recent studies that examined 'fresh' (in straw), 'ashed' (in burned straw) and 'aged' phytoliths (in soils). It is likely that dissolution of phytoliths is simultaneously controlled by various factors such as intrinsic characteristics (Haynes, 2017), pretreatment methods, solution chemistry (Fraysse et al 2009;Nguyen et al 2014) and soil properties (Nguyen et al 2019). However, there still might exist other unknown factors (e.g., microbial mining, gas exchange) that are likely involved in the dissolution of phytoliths.…”

Section: Introductionmentioning

confidence: 99%

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The Regulatory Role of CO2 on Nutrient Releases from Rice-Straw Phytoliths

Nguyen

et al. 2022

Preprint

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Phytolith has been widely known as a porous silica structure in numerous silicon (Si) accumulator plants, e.g., rice, that contain various nutrients and other beneficial elements too. When rice straw is returned to paddy fields, the silica structure of phytolith can be dissolved, thereby releasing its occluded nutrients. While the intrinsic characteristics and dissolution properties of phytoliths under the effect of solution chemistry have been intensively studied, the effect of gas phases, especially CO2, on phytolith stability and the implications for nutrient release are not fully known. Here, dissolution properties of phytolith ashes obtained from dry ashing of rice straw at 400, 600 and 800οC were investigated by quantifying Si release together with other nutrients under two atmospheric conditions, i.e., without and with CO2 support (aeration). In a time span of 6 days, the releases of nutrients (K, P, Ca, Mg) showed high dependence on the overall dissolution of the phytolith ashes. CO2 significantly reduced the dissolution rate of the phytolith ashes but increased the release rates of cationic as well as anionic nutrients. The aeration of CO2 shifted the carbonate equilibrium (H2CO3, HCO3− and CO32−) towards H2CO3, reducing solution pH, thereby decreasing the dissolution rate of phytoliths. Following this, intensification of H+ exchange promoted vast evacuation of cationic nutrients from the phytolith ashes. This indicates contrast responses of phytoliths and their occluded nutrients to CO2, and provides a better insight on the fate of soil phytoliths and the tendency of nutrient budgets from rice straw phytoliths in soils.

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Phytolith content in Vietnamese paddy soils in relation to soil properties

Cited by 39 publications

References 47 publications

Phytolith Content In Larix Gmelinii Forest Soils And Its Relations With Soil Properties

Phytolith Content In Larix Gmelinii Forest Soils And Its Relations With Soil Properties

Intensive Management Increases Phytolith-Occluded Carbon Sequestration in Moso Bamboo Plantations in Subtropical China

The Regulatory Role of CO2 on Nutrient Releases from Rice-Straw Phytoliths

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