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actual evapotranspiration

Overview page. Subjects: Environmental Science — Biological Sciences.

(AE)

The amount of water that evaporates from the surface and is transpired by plants if the total amount of water is limited. Compare potential evapotranspiration.

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afforestation

Overview page. Subjects: Environmental Science — Biological Sciences.

Planting trees. Tree-planting can stabilize soils by increasing interception and reducing run-off, reduce flooding through the reduction of silting, improve soil fertility, and provide...

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Alfisols

Overview page. Subjects: Biological Sciences — Environmental Science.

A soil order of the US soil classification. Alfisols are young, acid soils, with a clay-rich B horizon, commonly occurring beneath deciduous forests. See brown earth.

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algal bloom

Overview page. Subjects: Biological Sciences — Environmental Science.

The rapid increase in populations of algae and other phytoplankton, in particular cyanobacteria, that occurs in inland water systems, such as lakes. The density of the organisms may be such...

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alluvial fan

Overview page. Subjects: Environmental Science — Biological Sciences.

A mass of sediment deposited at some point at which there is a sharp decrease in gradient, e.g. between a mountain range and a plain. Essentially, a fan is the land-bound equivalent of a...

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anadromous

Overview page. Subjects: Biological Sciences — Environmental Science.

Describing the migration of certain fish, such as salmon, that spend most of their lives in oceanic waters before travelling to breed in the upper reaches of rivers and streams. Compare...

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ancient woodland

Overview page. Subjects: Environmental Science — Ecology and Conservation.

Both primary and secondary woodland that originated prior to a particular date, which in Britain is often set at around 1600, as secondary woodland was rarely created by planting before...

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anion-exchange capacity

Overview page. Subjects: Environmental Science — Biological Sciences.

A measure of the surface charge of an anion, expressed in equivalents of exchangeable ions per unit weight of the solid.

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apodous

Overview page. Subjects: Environmental Science — Biological Sciences.

Without legs.

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arachnid

Overview page. Subjects: Environmental Science — Zoology and Animal Sciences.

Air‐breathing arthropod such as spiders and mites, that has a body made of two segments (except mites) and four pairs of legs.

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