%0 Journal Article
%A Siebers, Nina
%A Sumann, Matthias
%A Kaiser, Klaus
%A Amelung, Wulf
%T Climatic Effects on Phosphorus Fractions of Native and Cultivated North American Grassland Soils
%J Soil Science Society of America journal
%V 81
%N 2
%@ 0361-5995
%C Madison, Wis.
%I SSSA
%M FZJ-2017-02810
%P 299-309
%D 2017
%X The climatic regime influences the turnover of P in soils, resulting in shifts in P fractions of different bonding forms. Here, we aimed at (i) identifying possible changes in P fractions as related to mean annual temperature (MAT) and mean annual precipitation (MAP), as well as (ii) elucidating how these patterns change under long-term agriculture. We analyzed different P fractions after sequential extraction according to the Hedley procedure from the top 10 cm of 18 native grassland sites and adjacent long-term agricultural fields along a temperature and precipitation transect from central Saskatoon to south Texas. The analyses were performed on bulk soils and clay fractions. The results showed that total P (Ptot) concentrations decreased with increasing MAT but were not clearly related to MAP. The contributions of total inorganic P (Pitot) and total organic P (Potot) to Ptot did neither change with MAT nor with MAP. The proportions of individual soil fractions were shifted from the labile and easily extractable P bonding forms to the more stable, residual P fractions with increasing annual temperature. Arable cropping induced loss of organic P (Po). The relationships to the climatic factors were sustained for the arable soil, but better reflected in the clay fractions than in the bulk soil. We conclude that there is a gross pattern of soil P distribution related to the climate, likely reflecting the increased biological processing as well as and progressing weathering and neoformation of secondary mineral phases as annual temperatures rise.
%F PUB:(DE-HGF)16
%9 Journal Article
%U <Go to ISI:>//WOS:000400696900007
%R 10.2136/sssaj2016.06.0181
%U https://juser.fz-juelich.de/record/828993