Met een RAAP bijdrage

De ministeries van LNV en VROM hebben een conceptmonitoringprogramma Groene Ruimte ontwikkeld. Momenteel vraagt de gegevensverzameling nog een aanzienlijke inspanning. Als in de toekomst een aantal geplande meetnetten operationeel is, zal dit waarschijnlijk minder worden. Het monitoringsysteem is zeer bruikbaar om een toestand te beschrijven. De systematiek van het systeem biedt structuur bij integratie van zeer uiteenlopende invalshoeken. In het proefproject was het monitoringsysteem minder geschiktvoor beleidsevaluatie, omdat weinig gegevens uit het verleden beschikbaar zijn.

Rainfall, water, sediment yields and evaporation were quantified in three catchment areas with undisturbed rain forest, selectively logged forest, and forest with shifting cultivation respectively. Despite a considerable regional variation in rainfall(1700-2300 mm/a), annual evaporation rates were similar (1209-1314 mm/a). The impact of land use practices on water yield is negligible compared to the effect of rainfall.

Eerste onderzoek naar maatschappelijk draagvlak van natuur

This Resolution approves the National Policy for the Control of Desertification. According to the United Nations Convention to Combat Desertification the main tool for the National Desertification Control Policy is the National Plan to Combat Desertification (PNCD). The PNCD is a tool for the formulation and coordination of actions for the combat of desertification, nor only of those that are already under implementation but also those that will be developed within the different Governmental sectors.

The introduction of soybeans to the southern and eastern parts of Paraguay in the early 1970s, followed by wheat in the mid-1970s, using conventional mechanised soil preparation practices with disc ploughs and harrows, initiated a process of widespread soil degradation and erosion. The technique of no-tillage was first used in Paraguay in the late 1970s. Following a slow start, its adoption by Paraguayan farmers gathered momentum increasing from 20,000 ha in 1991/92 to an impressive 250,000 ha in 1995/96, accounting for about 19% of the land cultivated mechanically.

The present issue of Forest Genetic Resources (FGR) goes to press immediately following the Eleventh World Forestry Congress held in Turkey 13-22 October 1997, which more than 4000 colleagues from 145 countries attended. In regard to the conservation and use of forest genetic resources, the Congress, in its deliberations and report, stressed that action to conserve, manage, sustainably utilize and enhance forest genetic resources is an urgent priority.