Aller au contenu principal

page search

Displaying 3925 - 3936 of 4607

Bracken distribution in Great Britain: strategies for its control and the sustainable management of marginal land

LandLibrary Resource
Journal Articles & Books
Décembre, 2000

Bracken is often perceived as a widespread and increasing land management problem. The pollen record of a wide range of sites in Great Britain suggests that the current abundance of bracken is less than or, at worst, equivalent to maximum historical levels. Recently gathered data also suggest that bracken cover is declining.

Invasive weeds in rangelands: Species, impacts, and management

LandLibrary Resource
Journal Articles & Books
Décembre, 2000
États-Unis d'Amérique

Rangeland and pastures comprise about 42% of the total land area of the United States. About three-quarters of all domestic livestock depend upon grazing lands for survival. Many ranges have had domestic stock grazing for more than 100 years and, as a result, the plant composition has changed greatly from the original ecosystems.

Vegetation‐environment relationships in Atlantic European calcareous grasslands

LandLibrary Resource
Journal Articles & Books
Décembre, 2000
France
Irlande
Espagne

The relationship between vegetation and environment was investigated for calcareous grasslands in a region in the west of Spain, France, Britain and Ireland defined by climatic criteria. Vegetation was sampled using objective methods and data collected on soils, land cover, location and management. Climate data were obtained from an available database.

To ranch or not to ranch: home on the urban range?

LandLibrary Resource
Journal Articles & Books
Décembre, 2000

California ranchers in urban Alameda and Contra Costa Counties, and in rural Tehama County, were surveyed to examine effects of increasing development, land use change, and attrition of the ranching community on their commitment to ranching, and to assess land conservation program acceptability. Questions were about practices, reasons for ranching, and what influences ranching's future.

Enhancement of capacity in applied biometry in East and southern Africa

LandLibrary Resource
Conference Papers & Reports
Décembre, 2000

Biometric skills in developing countries are inadequate to support the changing priorities of agricultural research with the consequence that the quality of research aimed at increasing food security and alleviating poverty is often deficient because it lacks good statistical design" (CTA, 1997).