Meteorological and management influences on seasonal variation in phosphorus fractions extracted from soils in western Ireland

Changes in soil P chemistry as affected by conversion of natural secondary forests to larch plantations

“…The value of soil bioavailable P depends on the factors such as mineralization-immobilization of organic P, and adsorption-desorption and precipitation-dissolution of inorganic P (Frossard et al, 2000). Recently, Styles and Coxon (2007) shows that labile inorganic P concentration follows a distinct seasonal trend of winter maximum and summer minimum in western Ireland. However, we found that the NaHCO 3 -Po/TP ratio was higher in summer and lower in spring or autumn in our study, contrary to the findings of and Styles and Coxon (2007).…”

“…Recently, Styles and Coxon (2007) shows that labile inorganic P concentration follows a distinct seasonal trend of winter maximum and summer minimum in western Ireland. However, we found that the NaHCO 3 -Po/TP ratio was higher in summer and lower in spring or autumn in our study, contrary to the findings of and Styles and Coxon (2007). This may be because the NaHCO 3 -Po fraction was affected by microbial biomass P and plant uptake (Fabre et al, 1996).…”

“…The fluctuation in P fractions during the growing season, particularly soil P transformation process, is considered an important factor in controlling P availability and ultimately in influencing plant nutrition (Eviner et al, 2006). Several studies on temperate ecosystems have shown a considerable seasonal variation of P fractions Styles and Coxon, 2007;Zhao et al, 2009). However, there also appear inconsistent findings (e.g.…”

Seasonal variations in phosphorus fractions in semiarid sandy soils under different vegetation types

“…Since the 1950s, people started to study the seasonal variations in soil P availability and fractions on cropland and pasture (Perrott et al, 1990;Magid and Nielsen, 1992;Oberson et al, 1999). Recently, a few studies on grassland, savanna, and forest were also reported (Fabre et al, 1996;Chen et al, 2003;Styles and Coxon, 2007). However, the conflicting seasonal patterns were observed for soil P fractions, especially for labile P and microbial biomass P due to the varied climates, soils, and vegetation types (Oberson et al, 1999;Picone et al, 2003;Styles and Coxon, 2007).…”

“…Recently, a few studies on grassland, savanna, and forest were also reported (Fabre et al, 1996;Chen et al, 2003;Styles and Coxon, 2007). However, the conflicting seasonal patterns were observed for soil P fractions, especially for labile P and microbial biomass P due to the varied climates, soils, and vegetation types (Oberson et al, 1999;Picone et al, 2003;Styles and Coxon, 2007). Moreover, most of these studies were conducted in tropical or humid temperate regions where water may not be a limiting factor.…”