Evaluation of the phosphorus status of P-deficient podzols in temperate pine stands: combining isotopic dilution and extraction methods

被引:64
作者
Achat, David L. [1 ]
Bakker, Mark R. [1 ]
Augusto, Laurent [1 ]
Saur, Etienne [1 ]
Dousseron, Lysiane [1 ]
Morel, Christian [1 ]
机构
[1] INRA, ENITAB, TCEM, UMR 1220, F-33883 Villenave Dornon, France
关键词
Available phosphorus; P-deficiency; Phosphorus stocks; Pinus pinaster; Podzol; ORGANIC PHOSPHORUS; LITTER DECOMPOSITION; MICROBIAL BIOMASS; FOREST SOILS; CHEMICAL-COMPOSITION; GRASSLAND; CARBON; MINERALIZATION; PHOSPHATE; DYNAMICS;
D O I
10.1007/s10533-008-9283-7
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
Phosphorus (P) is often a limiting factor of forest growth but our knowledge of the processes governing P availability in forest soils is rather limited. In the present work, we combined a isotopic dilution method with extraction methods to evaluate the P status in Pinus pinaster plantation forests on highly P-deficient soils. Total, organic, and inorganic P, dissolved and diffusive P, i.e. ionic P species that can be transferred from the solid phase to the soil solution due a gradient of concentration, were determined to a soil depth of 120 cm in a gradient of 18 forest sites (seven humid sites, five mesic sites, and six dry sites). Our objective was to assess the potential contribution of organic and inorganic P to plant available P. Based on results and our original assumptions, we observed that the contribution of organic P fractions (mineralization of soil organic P) to P availability related to the contribution of inorganic P fractions (diffusive P for durations up to 1 year) was predominant in litter, less important in top soil horizons, and negligible at depths below 30 cm. This was partly due to a decreasing proportion of organic P and an increasing proportion of diffusive P with soil depth. Owing to a very low amount of diffusive P in the top soils in dry sites, the relative contribution of organic P was actually higher in these sites than in humid and mesic sites, despite a lower overall organic P fraction. The combination of extraction and isotopic dilution methods in our study shed new light on P status in this forest range. In particular, these methods enable assessment of both the size of the pools and their dynamic fractions.
引用
收藏
页码:183 / 200
页数:18
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