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Soil and phosphorus redistribution along a steep tea plantation in the Feitsui reservoir catchment of northern Taiwan

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Feitsui reservoir, the major water supply of Taipei city, has shown declining water quality in recent years.
The reservoir is located in an area famous for tea cultivation, and the question arises as to whether the
hillside tea plantations have contributed to increased sediment and nutrient discharge into the reservoir. In
this study, soil and phosphorus redistribution were examined along a steep tea plantation in the reservoir’s
catchment and the provenance of reservoir sediment was assessed. Fallout radionuclides were used as soil
erosion/deposition tracers and as markers of sediment sources. Continuous fertilizer application has raised
(inorganic) phosphorus levels in the studied tea plantation. The plantation’s narrow bench terraces trap
eroded material and slow down soil and nutrient translocation. Nevertheless, eroded soil and phosphorus
have accumulated on a vegetated toeslope below the tea plantation. The reservoir sediment contained
significant amounts of inorganic phosphorus and cesium-137, and application of a mixing model resulted
in a surface soil contribution of approximately 30%. This points towards tea plantations as possible sediment
and pollutant sources and underlines the necessity of soil conservation strategies, such as the maintenance
of vegetated riparian buffer zones. However, other sources, such as landslide debris and urban wastewaters,
cannot be entirely ruled out. Further research is needed to better characterize the catchment’s soils and
sediments and to improve sediment fingerprinting efforts. Potential point and non-point pollution
sources need to be examined in detail to better understand how phosphorus enters the reservoir.

Key words: Cs-137, deposition, erosion, Pb-210, radionuclide.

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Informasi Detail

Judul Seri

Soil Science and Plant Nutrition

No. Panggil

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Penerbit

: Japanese Society of Soil Science and Plant Nutrition., 2008

Deskripsi Fisik

Soil Science and Plant Nutrition (2008) 54, 618–626

Bahasa

English

ISBN/ISSN

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Klasifikasi

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Tipe Isi

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Tipe Media

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Tipe Pembawa

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Edisi

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Subjek

PERTANIAN.

Info Detail Spesifik

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Pernyataan Tanggungjawab

agus

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