Enhanced soil aggregate stability limits colloidal phosphorus loss potentials in agricultural systems

Li, Fayong; Li, Hua; Jin, Yingbin; Jin, Junwei; He, Minfei; Klumpp, Erwin; Bol, Roland

doi:10.1186/s12302-020-0299-5

Cited by 29 publications

(9 citation statements)

References 71 publications

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“…However, since most grasses (e.g., forages) take up about 40–70 kg P/ha per growing season and the final sampling date was at the beginning of the growing season on 4/13/20, it is unlikely that this led to an appreciable removal of soil P from the system. Thus, the most plausible explanation for the loss of P from the fire retardant-treated plots on this final sampling date after 71 cm of cumulative rainfall was leaching below 2.5 cm similar to the rationale provided by Hopmans et al It is likely the applied P moved below 2.5 cm via colloid-facilitated transport of P sorbed to clay particles. − …”

Section: Resultssupporting

confidence: 61%

Seasonal Impact of Phosphate-Based Fire Retardants on Soil Chemistry Following the Prophylactic Treatment of Vegetation

Reinhart

Hunter

et al. 2021

Environ. Sci. Technol.

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A preventative treatment of fire retardants at high-risk locales can potentially stop a majority of wildfires. For example, over 80% of wildfire ignitions in California occur at high-risk locales such as adjacent to roadsides and utility infrastructure. Recently a new class of ammonium polyphosphate retardants was developed with enhanced adherence and retention on vegetation to enable prophylactic treatments of these high-risk locals to provide season-long prevention of ignitions. Here, we compare three different ammonium (poly)phosphate-based wildland retardant formulations and evaluate their resistance to weathering and analyze their seasonal impact on soil chemistry following application onto grass. Soil samples from all three treatments demonstrated no changes in soil pH and total soil carbon and nitrogen amounts. Total soil phosphorus amounts increased by ∼2−3× following early precipitation, always remaining within typical topsoil amounts, and returned to the same level as control soil before spring. Available indices of ammonium, nitrate, and phosphate levels for all groups were elevated compared to the untreated control samples, again remaining within typical topsoil ranges across all time points and rainfall amounts evaluated. Microbial activity was decreased, potentially because the addition of available nutrients from retardant application reduced the need for organic decomposition. These results demonstrate that the application of ammonium (poly)phosphate-based retardants does not alter soil chemistry beyond typical topsoil compositions and are thus suitable for use in prophylactic wildfire prevention strategies.

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Section: Resultssupporting

confidence: 61%

Seasonal Impact of Phosphate-Based Fire Retardants on Soil Chemistry Following the Prophylactic Treatment of Vegetation

Reinhart

Hunter

et al. 2021

Environ. Sci. Technol.

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“…This confirms the conclusion drawn by other authors (Li et al, 2021; McLaren et al, 2014; Nakayama et al, 2021; Wei et al, 2022), who reported moderately labile Po as the P strongly associated with organic soil components. Furthermore, we also observed the distribution of moderately labile Po among aggregate was greatly associated with large aggregate than small aggregate because the aggregation promoted by organic matter counteracts the dispersion of the small mineral particles where P is retained (He et al, 2019; Li et al, 2020).…”

Section: Discussionmentioning

confidence: 84%

An assessment of various pools of organic phosphorus distributed in soil aggregates as affected by long‐term P fertilization regimes

Khan

Guo

Wang

et al. 2023

Soil Use and Management

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The phosphorus (P) forms in long-term fertilization determine the fate and transport of P in soil. However, the fate of various pools of organic P of added P in the long-term measured with sequential chemical fractionation is not wellunderstood. Four soil physical aggregates (>250, 125-250, 63-125 and <63 μm) from 0-to 20-cm depth after 35 years of long-term fertilization treatments including control (CK), nitrogen and phosphorus fertilizer (NP) and NP combined with farmyard manure (NPM) under continuous winter wheat were separated using settling tube apparatus. Results showed that the application of long-term P fertilization had no apparent effects on promoting the mass proportion of soil aggregates except for >250 μm, where the NP and NPM treatments significantly increased the mass proportion by 60% and 70% over CK, respectively. Compared with CK, P fertilizer (NP and NPM) treatments significantly increased organic P (Po) contents in each size aggregate. In particular, mean labile Po increased by 35% and 246%, moderately labile Po by 125% and 161%, nonlabile Po by 105% and 170% and total Po (TPo) by 101% and 178%, respectively, under NP and NPM treatments, respectively. There was a significant correlation between soil organic carbon (SOC) and Po fractions. SOC was exponentially positively correlated with labile Po but linearly positively correlated with moderately labile Po, nonlabile Po and TPo fractions among soil aggregates. A reduced C:Po ratio (<100) in soil aggregates among treatment indicates a large amount of available P accumulated in soils, and soil P loss risk in the study site is still high. Our results show that the Po pool measured by sequential chemical fractionation may represent an important, yet often overlooked, source of P in agriculture ecosystems. According to the result, long-term mineral P fertilizer combined with organic amendments better sustains soil structural stability in large aggregates, contributing more Po availability in the moderately labile P followed by labile P in soil aggregates.

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“…Soil aggregates regulate soil nutrient availability, influence soil pore composition, enhance soil structure and function, and enhance soil hydraulic properties (Fu et al., 2020; R. Wang et al., 2015; Whalen & Chang, 2002). The proportions of soil macroaggregates (>0.25 mm) indicate the stability of soil structure and soil structure, whereas the proportions of soil microaggregates (<0.053 mm) indicate the soil fertility status (Li et al., 2020; Liu et al., 2019). Therefore, we analyzed the distribution of different sizes (>0.25 and <0.053 mm) of water‐stable aggregates to assess soil physical crust stability.…”

Section: Methodsmentioning

confidence: 99%

Aggregate stability in rainfall‐induced soil physical crusts on the Loess Plateau, Northwest China

Lin

et al. 2022

Soil Science Soc of Amer J

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Comprehensive insights into the aggregate stability of physical crusts enhance the understanding of erosional processes and transport mechanisms. This study evaluated the erosion resistance and aggregate stability in structural and sedimentary crusts of a Lou soil induced by simulated rainfall. A runoff plot (200 cm long × 100 cm wide × 50 cm high) with a slope of 5˚was set up to simulate contour tillage (20 cm in ridges, 30 cm in furrows). A single rainfall intensity (60 mm h −1 ) was applied over six durations (5, 10, 15, 20, 25, and 30 min) to obtain structural and sedimentary crusts. With an increase in rainfall duration, bulk density of structural and sedimentary crusts increased from 1.26 g cm −3 (soil before rainfall) to 1.56 and 1.58 g cm −3 , respectively. Macroaggregate contents in structural crust changed slightly (from 7.5 to 7.4%); however, a marked increase (from 9.0 to 18.6%) was observed in sedimentary crust with increased rainfall duration. The mean weight diameter and geometric mean diameter (i.e., the inverse of erodibility factor) in structural crusts were lower than sedimentary crusts developed from all rainfall conditions. The aggregate stability index of structural and sedimentary crusts initially increased from 2.12 and 2.07 with the increase in rainfall duration, respectively, and then leveled off at 2.42 and 2.48. Soil aggregate stability of sedimentary crust, which conferred greater resistance against external erosive forces, was stronger than that of structural crust.

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Enhanced soil aggregate stability limits colloidal phosphorus loss potentials in agricultural systems

Cited by 29 publications

References 71 publications

Seasonal Impact of Phosphate-Based Fire Retardants on Soil Chemistry Following the Prophylactic Treatment of Vegetation

Seasonal Impact of Phosphate-Based Fire Retardants on Soil Chemistry Following the Prophylactic Treatment of Vegetation

An assessment of various pools of organic phosphorus distributed in soil aggregates as affected by long‐term P fertilization regimes

Aggregate stability in rainfall‐induced soil physical crusts on the Loess Plateau, Northwest China

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