التفاصيل البيبلوغرافية
| العنوان: |
Field soil and ditch sediment phosphorus dynamics from two artificially drained fields on poorly drained soils |
| المؤلفون: |
Daly, K., Tuohy, P., Peyton, D., Wall, D.P., Fenton, O. |
| المجموعة: |
RePEc (Research Papers in Economics) |
| الوصف: |
The installation of artificial drains alters soil permeability such that migrating water interacts with soil and sediment biogeochemistry to mobilise or attenuate phosphorus (P). Soil and ditch sediment P chemistry was explored at two artificially drained sites with similar land use, management and drainage class. Site A was characterised by high total P content (282–1437mgkg−1) and elevated water soluble P (WSP) (10.11mgkg−1) in a Humic topsoil. Subsurface horizons contained high amounts of leached aluminium (Al) and iron (Fe) and P sorption capacities expressed by the Freundlich K term increased with depth from 338 to 942mgkg−1. Site B was characterised by low TP (58–476mgkg−1) and low P sorption capacities (40–173mgkg−1) that decreased with depth, owing to a high% sand and low Al. Bankside and sediment in the ditch were mostly higher or comparable to P sorption properties measured in subsurface soil horizons from adjacent fields. Dissolved reactive P (DRP) concentrations were monitored in the open ditch, end-of-pipe and in-field piezometers and highest values were recorded in the open ditch (0.03–0.183mgl−1) at Site A, potentially due to diffuse and point sources on the farm. Higher P concentrations were recorded at end-of-pipe locations compared to piezometers at similar depth, and attributed to a larger contributing area reaching the pipe from the surface and surrounding subsurface layers. Attenuation of WSP by subsoil at Site A was evidenced by low piezometer values (0–0.003mgl−1). Low P sorption in the ditch at Site B suggests that dredging could expose low P sorbing layers, but adding topsoil could enhance P sorption. Drainage design, maintenance, and measures for P mitigation require an assessment of surface and subsurface P dynamics to ensure a ‘right measure right place’ approach. ; Phosphorus; Sorption; Drainage water; Attenuation; Soil; Ditch |
| نوع الوثيقة: |
article in journal/newspaper |
| اللغة: |
unknown |
| العلاقة: |
http://www.sciencedirect.com/science/article/pii/S0378377417302287Test |
| الإتاحة: |
http://www.sciencedirect.com/science/article/pii/S0378377417302287Test |
| رقم الانضمام: |
edsbas.AB2516C3 |
| قاعدة البيانات: |
BASE |
