Oxford Index Browse

You are looking at 1-10 of 803 items for:

Overview x Ecology and Conservation x Plant Sciences and Forestry x clear all

Refine by type

Refine by product

 

Aapa mires

Overview page. Subjects: Plant Sciences and Forestry — Ecology and Conservation.

Fens, sometimes called ‘string bogs’, of circumpolar distribution, found in northern Scandinavia and boreal Canada. They are soligenous mires with ridges arranged roughly normal to the...

See overview in Oxford Index

abaxial

Overview page. Subjects: Ecology and Conservation — Plant Sciences and Forestry.

Of a plant organ, facing away from the axis or main stem (e.g. the lower surface of leaves). Compare adaxial.

See overview in Oxford Index

absolute pollen frequency

Overview page. Subjects: Ecology and Conservation — Plant Sciences and Forestry.

(APF)

The expression of pollen data from sediments in terms of the absolute numbers (for each species, genus, or family) per unit area of surface and, where deposition rates are...

See overview in Oxford Index

absorption

Overview page. Subjects: Plant Sciences and Forestry — Ecology and Conservation.

The uptake of substances, usually nutrients, water, or light, by cells or tissues.

See overview in Oxford Index

accidental species

Overview page. Subjects: Plant Sciences and Forestry — Ecology and Conservation.

One of five classes of fidelity used by the Braun-Blanquet school of phytosociology in the description and classification of plant communities. Accidentals are rare species in the...

See overview in Oxford Index

accumulated temperature

Overview page. Subjects: Plant Sciences and Forestry — Ecology and Conservation.

The sum, counted in degrees, by which the actual air temperature rises above or falls below a datum level over a prolonged period. The datum level is usually set at a value relevant to an...

See overview in Oxford Index

accumulator

Overview page. Subjects: Plant Sciences and Forestry — Ecology and Conservation.

1 In plant succession studies, a pioneer plant species whose activities are claimed to enrich the abiotic environment with nutrients.

2 A plant that...

See overview in Oxford Index

acervulus

Overview page. Subjects: Ecology and Conservation — Plant Sciences and Forestry.

An asexual, conidia-bearing structure that is formed by certain fungi parasitic in plants. It consists of a mat of fungal tissue which bears a layer of conidiophores; initially formed...

See overview in Oxford Index

acidic dye

Overview page. Subjects: Plant Sciences and Forestry — Ecology and Conservation.

A dye which consists of an organic anion that combines with and stains positively charged macromolecules. It is used particularly for staining cytoplasm. Compare basic dye.

See overview in Oxford Index

acidic grassland

Overview page. Subjects: Plant Sciences and Forestry — Ecology and Conservation.

A grassland that occurs on acid soil: it is usually derived from former woodland as a consequence of centuries of grazing and, to a lesser extent, burning. In Britain and much of...

See overview in Oxford Index