Soil aggregates and associated carbon and nitrogen storage in circular grass buffer integrated cropping systems

Sapkota, Sundar; Ghimire, Rajan; Schutte, Brian J.; Idowu, Omololu J.; Angadi, Sangu

doi:10.1007/s11368-024-03721-0

Cited by 3 publications

(1 citation statement)

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“…The distribution of P fractions and P's bioavailability in soils is closely related to the distribution of soil aggregates [18][19][20][21], especially as smaller aggregates keep more P reserves, while larger aggregates exhibit a higher P supplying capacity [22]. In conclusion, the composition of soil aggregates is determined by factors such as soil parent material, vegetation type, and climate, while the composition of soil aggregates significantly influences the distribution characteristics of organic matter and nutrients in soil [23,24]. Therefore, aggregates serve as the fundamental units of soil structure and the fractionation, distribution characteristics, and influencing factors of P within soil aggregates inherently reflect the biogeochemical characteristics and cycling mechanisms of P.…”

Section: Introductionmentioning

confidence: 99%

Fractionation of Inorganic Phosphorus in Cold Temperate Forest Soils: Associating Mechanisms of Soil Aggregate Protection and Recovery Periods after Forest Fire Disturbance

Wang,

Li,

Wang

et al. 2024

Forests

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The soil aggregate is the fundamental unit of soil structure. The fractionation characteristics and influencing factors of phosphorus (P) in soil aggregates inherently link its geochemical characteristics and recycling mechanism. This work investigated the fractionation characteristics of inorganic P in cold temperate forest soils and studied the impacts of recovery periods after forest fires and soil aggregate protection mechanisms on P fractionation. Our results showed that the TP, active P, stable P, and total organic carbon (TOC) contents varied with increasing recovery years after forest fire disturbance. The TP content in the coarse particulate organic matter fraction (cPOM) exhibited an increasing trend with the number of recovery years. Redundancy analysis (RDA) and correlation analysis indicated that TOC played a crucial role in influencing the dynamics of P fractionation during the recovery process. The order of TP levels in different soil aggregate fractions was as follows: μClay > dClay > LF > cPOM > dSilt > μSilt > iPOM, with significant contributions from the cPOM and dSilt fractions. The ranking of P fractions in bulk soils was as follows: ACa-P > Fe-P > Oc-P > Or-P > De-P > Al-P > Ex-P. The protective mechanism of soil aggregates had a more significant effect on TOC than TP, with the order of protective abilities being: Phy×biochem-protected > Biochem-protected > Phy-protected > Non-protected mechanism. TOC and recovery years emerged as critical factors influencing the dynamics of different P fractions during post-fire recovery. Soil aggregate protection mechanisms demonstrated significantly higher effects on TOC than on TP. This study provides insights into the fractionation mechanisms of P in the soil–forest ecosystem of the Greater Khingan Mountains, contributing to the sustainable development and utilization of cold temperate forest ecosystems.

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