Responses of Organic Phosphorus Fractionation to Environmental Conditions and Lake Evolution

Abstract

Geochemical fractionation is used to assess the significance of environmental factors on organic phosphorus (OP) pools in sediments. Labile, moderately labile, and nonlabile OP pools in the sediments from Lake Hulun, Inner Mongolia, were fractionated, and their responses to environmental conditions and lake evolution were investigated based on the spatial and vertical distribution of OP fractionations. In light of the recalcitrant characteristics of organic matter (OM) in different environmental conditions, the pH presents significant negative effects on the amount of labile OP, while water depth shows an important role in regulating the distribution between the moderately labile and nonlabile OP pools. A latitudinal zonation in the distribution of OP pools in surface sediments from different lakes was apparent with this zonation likely linked to the gradient effects of climate and anthropogenic activities on OM decomposition and thereby on the sediments capacity to hold phosphorus. These results show that OM plays a role in governing the impacts of weather and environmental factors on OP fractionation in aquatic environments. This work suggests that OP pools in the sediment core could be used as an archive for environmental conditions and lake evolution.

Spatial dynamics of phosphorus in the natural-rural-suburban-urban river sediment continuum (Qinhuai River basin, China): Insights into concentration, fractionation, and environmental risk assessment of phosphorus

“…NL-OP was the least active component of OP, with low biological e ciency (Bai et al 2020, Wan et al 2020). NL-OP fraction dominated the OP in the surface sediments of the natural and rural regions, accounting for 52.5-57.6% and 31.6-75.5% of OP, respectively, consistent with previous studies (Lu et al 2016). OP fraction was positively correlated with OM and TN content (Table S4), which supports earlier studies (Younis et al 2022) that reported that OM controls OP in sediments (Wan et al 2020).…”

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

“…This leads to an increase in the quantity of plant and animal residues, as well as litterfall entering the soil, resulting in significantly elevated TOC levels. Organic matter plays a significant role as a source of soil P, releasing inorganic P during the mineralization process [2,50,51]. Moreover, the mineralization decomposition of organic matter generates organic acids that promote the transformation of stable inorganic P into active P. Additionally, the presence of the fulvic acid polyanions in organic matter can enter mineral particles through selective adsorption, competing with phosphate anions and thereby facilitating the release of inorganic P [52] and increasing the activity of soil P. Therefore, the restoration periods are significantly positively correlated with both TP and various fractions of active P, with TOC playing a crucial role in this process.…”

“…The concentration, fractionation, and cycling processes of phosphorus (P) in soils directly impact its bioavailability, making them a crucial factor in determining the structure and functioning of ecosystems [1][2][3]. It has been indicated that the distribution of P forms in soils is a result of multiple interacting factors, including soil pH, clay content, organic carbon content, microbial activity, free ions of iron and aluminum, active calcium carbonate, and the surface hydrology conditions [4][5][6][7][8].…”