Kinetics of phosphorus sorption/desorption by soil aggregates in a long‐term revegetation desert ecosystem

Li, C.; He, Mingzhu; Ren, Jianxin; Li, Manfei; Tang, Liang

doi:10.1002/ldr.4394

Cited by 6 publications

(4 citation statements)

References 53 publications

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“…Due to the significant difference between soil with different textures and aggregate size in their adsorption and desorption abilities, aggregate-associated P and its ER varied with aggregate size (Figure 4). Similar to the relationship between organic carbon and aggregate size (Kristiansen et al, 2006;Ma et al, 2022), the content variation of clay, silt, and sand in various size aggregates can also result in the difference in the content of adsorbed P and the release capacity of water-soluble P (Li et al, 2022;Zhu et al, 2023).…”

Section: Discussionmentioning

confidence: 87%

“…The variation in the total effect of clay content on different aggregate sizes indicated that although soil clay content is the main factor affecting ER i , the effect of aggregate size also needs to be considered. Additionally, compared with sand content, clay content exhibited a greater effect on macro aggregates (>0.25 mm), while a smaller effect on micro aggregates (<0.25 mm) (Figure 8b,c), implying that the mechanisms of P enrichment vary with aggregate sizes (Li et al, 2022). In the present study, it was shown that soils with ER i exceeding 1 had a higher clay content (silt clay and clay loam), in contrast, a lower clay content (silt clay loam and loam) for soil with ER i < 1 (Figure 4c).…”

Section: Discussionmentioning

confidence: 99%

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Soil texture as a regulatory pathway for the enrichment of aggregate‐associated phosphorus

Wang,

Wei,

Yang

et al. 2024

Land Degrad Dev

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Soil phosphorus (P) loss induced by erosion is an imminent threat to global food security, and as the linkage between erosion and P loss, aggregate is the unit for soil P storage. This study investigated the impacts of soil texture on aggregate‐associated P and its enrichment rate by using soils with four typical textures (silty clay, clay loam, silty clay loam, and loam) from croplands with the same field management in Danjiangkou (Hubei, China), the water source for the Middle Route of South‐to‐North Water Diversion. The initial P concentration in the range of 36.5 to 411.2 mg kg−1 was generated by laboratory incubation, and aggregate‐associated P was determined by the combination of wet sieving and molybdenum blue colorimetric method. Aggregate‐associated P was shown to be mainly concentrated in <0.05 mm aggregates (23.20–315.52 mg kg−1), accounting for 30.71%–35.28% of P concentration for a unit mass of soil. In addition, aggregate‐associated P and its enrichment rate generally decreased with the decline of clay content (333.76–63.25 mg kg−1 in 1–0.5 mm size aggregate) under the same aggregate size fraction, while they all exhibited a unimodal distribution (increasing first and then decreasing) with decreasing aggregate size. Moreover, clay content made the most contribution to the increase of aggregate‐associated P (R2 > 0.56) and its enrichment rate (R2 = 64.4%, p < 0.01), while CaCO3 showed a contrary trend (R2 > 0.56, and R2 = 49.1%, p < 0.01). Collectively, variations of aggregate‐associated P and ERi were mainly attributed to soil clay fraction‐regulated P adsorption.

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Section: Discussionmentioning

confidence: 87%

Section: Discussionmentioning

confidence: 99%

Soil texture as a regulatory pathway for the enrichment of aggregate‐associated phosphorus

Wang,

Wei,

Yang

et al. 2024

Land Degrad Dev

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“…And enzyme serves as a viable index for monitoring biological soil crust stability in a desert revegetation chronosequence (Wang, Liu, & Zhao, 2020). Of course, enzymes secreted by microorganisms also enhanced available P content by hydrolyzed organic/inorganic P. Furthermore, poor available P can be alleviated by other P fractions such as dicalcium phosphate (Ca 2 ‐P), octacalcium phosphate (Ca 8 ‐P), hydroxyapatite (Ca 10 ‐P), aluminum phosphate compounds (Al‐P), iron phosphate compounds (Fe‐P), and occluded phosphorus (O‐P; Lajtha & Schlesinger, 1988; Li et al, 2022). Despite the significant role exerted by microbial activity (mainly enzymatic activity) in desert revegetation chronosequences, little knowledge is available for the properties of phosphorus sorption–desorption and changes in their fractions specifically in microbial activity soils within this context.…”

Section: Introductionmentioning

confidence: 99%

Phosphorus sorption–desorption changes phosphorus fraction dynamic in a desert revegetation chronosequence

Li,

He,

Xin

et al. 2024

Land Degrad Dev

Self Cite

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Understanding the characteristics of soil phosphorus (P) sorption and desorption is essential for comprehending P biogeochemical cycling and effectively managing ecosystems in a desert revegetation chronosequence. The present study utilized the Freundlich model and enzymatic activity to characterize the features of P sorption–desorption, and microbial activity, which aims to elucidate the effect of P kinetics and microbial activity on P fractions in the soils of a desert revegetation chronosequence, consisting of 11, 31, 40, 57, and 65 years old revegetated deserts. The findings revealed that the 31 years old soil showed the highest alkaline phosphomonoesterase and phosphodiesterase activities, and the 40 years old displayed the highest inorganic pyrophosphatase activity. In revegetated desert soils, microbial activity changed P sorption–desorption kinetics by decreased or increased the parameters including sorption/desorption energy site, P sorption/desorption ability, and the maximum buffering capacity of P sorption/desorption. And in microbial activity soils of 31–40 years old, P desorption significantly decreased T‐P and A‐P concentrations (p < 0.05). P sorption process and enzyme activity explained 35.10% and 22.20% of P fraction variation, respectively; and P desorption process and enzyme activity explained 48.3% and 22.3% of P fraction variation, respectively. These findings provide valuable insights into the contribution of P kinetics coupled with microbial activity in desert ecosystems, aiding in the effective management of these fragile ecosystems.

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“…Macroaggregates, microaggregates and clay particles are bound in different ways through soil organic matter and minerals [14,15]. Different sizes of aggregates have various specific surface areas, microbial compositions and abundances [16], suggesting the aggregates differ in absorbing and releasing of P [17].…”

Section: Introductionmentioning

confidence: 99%

Speciation of Iron and Aluminum in Relation to Phosphorus Sorption and Supply Characteristics of Soil Aggregates in Subtropical Forests

Yi,

Zhu,

Chen

et al. 2023

Forests

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Phosphorus (P) is one of the main limiting nutrients in subtropical forest soils. Both soil type and aggregate structure affect the P sorption capacity of soil; thus, determining soil P supply and leaching characteristics. However, the mechanism of their interactions on soil P sorption and leaching at an aggregate level remains unclear. We classified soil aggregates from red soils and limestone soils in a subtropical forest via wet-sieving and carried out P isothermal sorption experiments. The P sorption maximum (Qm), P sorption strength (KL, KF), P sorption index (PSI) and maximum buffer capacity (MBC) were obtained by fitting to Langmuir and Freundlich isotherm equations. Moreover, different P fractions were determined to estimate the degree of P sorption saturation (DPS) of aggregates. The results showed that the Qm of the two soils were similar, but the sorption strength (KL, KF) and MBC of the limestone soil were higher than those of the red soil. Higher contents of free iron (Fe) oxide and amorphous aluminum (Al) oxide in the limestone soil may enhance the P sorption capacity and, thus, reduce P availability, resulting in a higher total P retention capacity than in the red soil. A higher content of complex Fe in red soil may reduce P sorption and, therefore, play a role in maintaining the supply capacity of soil-available P. The 0.25–0.5 mm aggregates of the two soils had the largest MBC among all aggregate sizes, and their P sorption and buffering capacity were stronger than other aggregates. The DPS of different aggregate sizes were all low, indicating that the soils of subtropical forests were in a state of P deficiency; thus, the risk of P leaching was low. The <0.1 mm aggregate in red soil had relatively high DPS and significantly lower PSI than the other aggregate sizes, indicating that it was more prone to P leaching. The results provide further insight into forest management to improve P availability and reduce P leaching in subtropical forest soils.

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Kinetics of phosphorus sorption/desorption by soil aggregates in a long‐term revegetation desert ecosystem

Cited by 6 publications

References 53 publications

Soil texture as a regulatory pathway for the enrichment of aggregate‐associated phosphorus

Soil texture as a regulatory pathway for the enrichment of aggregate‐associated phosphorus

Phosphorus sorption–desorption changes phosphorus fraction dynamic in a desert revegetation chronosequence

Speciation of Iron and Aluminum in Relation to Phosphorus Sorption and Supply Characteristics of Soil Aggregates in Subtropical Forests

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