Phosphorus in agricultural soils [electronic resource] : drivers of its distribution at the global scale

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Tác giả:

Ngôn ngữ: eng

Ký hiệu phân loại: 631 Specific techniques; apparatus, equipment, materials

Thông tin xuất bản: Washington, D.C. : Oak Ridge, Tenn. : United States. Dept. of Energy. Office of Science ; Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy, 2017

Mô tả vật lý: Size: 3418-3432 : , digital, PDF file.

Bộ sưu tập: Metadata

ID: 260643

 Phosphorus (P) availability in soils limits crop yields in many regions of the world, while excess of soil P triggers aquatic eutrophication in other regions. Numerous processes drive the global spatial distribution of P in agricultural soils, but their relative roles remain unclear. Here, we combined several global datasets describing these drivers with a soil P dynamics model to simulate the distribution of P in agricultural soils and to assess the contributions of the different drivers at the global scale. We analyzed both the labile inorganic P (P<
 sub>
 ILAB<
 /sub>
 ), a proxy of the pool involved in plant nutrition and the total soil P (P<
 sub>
 TOT<
 /sub>
 ). We found that the soil biogeochemical background (BIOG) and farming practices (FARM) were the main drivers of the spatial variability in cropland soil P content but that their contribution varied between P<
 sub>
 TOT<
 /sub>
  vs P<
 sub>
 ILAB<
 /sub>
 . Indeed, 97% of the P<
 sub>
 TOT<
 /sub>
  spatial variability could be explained by BIOG, while BIOG and FARM explained 41% and 58% of P<
 sub>
 ILAB<
 /sub>
  spatial variability, respectively. Other drivers such as climate, soil erosion, atmospheric P deposition and soil buffering capacity made only very small contribution. Lastly, our study is a promising approach to investigate the potential effect of P as a limiting factor for agricultural ecosystems and for global food production. Additionally, we quantified the anthropogenic perturbation of P cycle and demonstrated how the different drivers are combined to explain the global distribution of agricultural soil P.
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