![]() 2004 Celi and Barberis 2005 Berg and Joern 2006 Ruttenberg and Sulak 2011). Phosphomonoesters with multiple phosphate groups such as inositol-hexa-, -penta-, -tetra-, and -tri-phosphate have a very high affinity to sorb to charged surfaces of amorphous Al and Fe oxides and mineral edges (McKercher and Anderson 1989 Martin et al. Organic phosphorylated compounds differ in their affinity to sorb to charged surfaces in soil. In addition, phosphates can also sorb to negatively charged surfaces through polyvalent metal cations (Kleber et al. Further, they can be bound to mineral surfaces through ligand exchange (specific sorption). Being anions, phosphates sorb to positively charged surfaces in soil such as Fe and Al oxides and hydroxides as well as to positively charged binding sites on OM and at the edges of phyllosilicates (Hinsinger 2001 Celi and Barberis 2005 Gérard 2016). Inorganic P is mostly found in soil in the form of orthophosphate, which has a high affinity to precipitate with cations such as Ca 2+, Fe 3+ and Al 3+, and to a lesser extent as polyphosphate (Hinsinger 2001 Darch et al. Organic P comprises phosphomonoesters (PME), such as inositol phosphates, adenosine phosphates, and phospholipids, as well as phosphodiesters (PDE), such as deoxyribonucleic acid (DNA) and ribonucleic acid (RNA) (Stewart and Tiessen 1987 Darch et al. Phosphorus is present in soils in organic and inorganic forms that strongly interact with mineral surfaces and metal cations. However, little is currently known about the contribution of P to the stabilization of OM in soils (Tipping et al. Due to the high affinity of organic phosphorylated compounds to mineral surfaces, OP might also play an important role in the sorptive stabilization of organic matter (OM) in soils (Kleber et al. Therefore, it is important to better understand the dynamics of organic P (OP) and inorganic P (IP) in soils to be able to manage soil P more sustainably (George et al. Rock P suitable for fertilizer production is a finite resource (Cooper et al. ![]() Phosphorus (P) is an essential macronutrient necessary to all living organisms that controls primary production in many ecosystems (Aerts and Chapin 1999 Reich and Oleksyn 2004 Goll et al. Thus, the findings suggest that OP is more persistent in soil than OC, which is most likely due to strong sorptive stabilization of OP compounds to mineral surfaces. In contrast, the OP concentration was only significantly (p < 0.05) decreased in the sand size fraction but not in the other two particle size fractions due to land-use change. The OC concentrations of all three particle size fractions were significantly (p < 0.05) lower in soils converted to cropland than in adjacent soils under natural vegetation. ![]() Yet, the OC:OP ratio of the clay size fraction changed less markedly with latitude than the OC:OP ratio of the silt and the sand size fraction. The OC:OP ratios of the silt and clay size fraction were negatively correlated with latitude (R 2 = 0.49 and 0.34, respectively, p < 0.001). ![]() The OP concentrations of the silt and clay size fraction were both negatively correlated with mean annual temperature (R 2 = 0.30 and 0.31, respectively, p < 0.001). The clay size fraction contained on average 8.8 times more OP than the sand size fraction and 3.9 and 3.2 times more IP and OC, respectively. For this purpose, I analyzed the distribution of OP, IP, and OC among particle size fractions depending on geographical location, climate, soil depth, and land use, based on published data. Therefore, the aim of this study was to gain insights into the pools sizes of OP, IP and organic carbon (OC) in soils and soil particle size fractions. Despite the importance of phosphorus (P) as a macronutrient, the factors controlling the pool sizes of organic and inorganic P (OP and IP) in soils are not yet well understood. ![]()
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