e-journal

Dissolved and colloidal phosphorus fluxes in forest ecosystems—an almost blind spot in ecosystem research

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Understanding and quantification of phosphorus (P) fluxes are key requirements for predictions
of future forest ecosystems changes as well as for transferring lessons learned from natural ecosystems
to croplands and plantations. This review summarizes and evaluates the recent knowledge
on mechanisms, magnitude, and relevance by which dissolved and colloidal inorganic and
organic P forms can be translocated within or exported from forest ecosystems. Attention is paid
to hydrological pathways of P losses at the soil profile and landscape scales, and the subsequent
influence of P on aquatic ecosystems. New (unpublished) data from the German Priority
Program 1685 ‘‘Ecosystem Nutrition: Forest Strategies for limited Phosphorus Resources’’ were
added to provide up-to-date flux-based information.
Nitrogen (N) additions increase the release of water-transportable P forms. Most P found in percolates
and pore waters belongs to the so-called dissolved organic P (DOP) fractions, rich in orthophosphate-
monoesters and also containing some orthophosphate-diesters. Total solution P
concentrations range from ca. 1 to 400 µg P L–1, with large variations among forest stands. Recent
sophisticated analyses revealed that large portions of the DOP in forest stream water can
comprise natural nanoparticles and fine colloids which under extreme conditions may account
for 40–100% of the P losses. Their translocation within preferential flow passes may be rapid,
mediated by storm events. The potential total P loss through leaching into subsoils and with
streamswas found to be less than 50mgPm–2 a–1, suggesting effects on ecosystems at centennial
to millennium scale. All current data are based on selected snapshots only. Quantitative measurements
of P fluxes in temperate forest systems are nearly absent in the literature, probably due to
main research focus on the C and N cycles. Therefore, we lack complete ecosystem-based assessments
of dissolved and colloidalP fluxes within and fromtemperate forest systems.

Key words: forest ecosystem / phosphorus / fluxes / soil / processes / hydrology

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Ketersediaan

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Informasi Detail

Judul Seri

Journal Plant Nutrition Soil Science

No. Panggil

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Penerbit

: ., 2016

Deskripsi Fisik

J. Plant Nutr. Soil Sci. 2016, 179, 425–438

Bahasa

English

ISBN/ISSN

DOI: 10.1002/jpln.20

Klasifikasi

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Tipe Isi

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Tipe Media

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Tipe Pembawa

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Edisi

2016, 179

Subjek

PERTANIAN.

Info Detail Spesifik

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Pernyataan Tanggungjawab

agus

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