4.2. Impact of Humanitarian Crises on Ecosystems (U. Bloesch, Swiss Disaster Relief-Bern)
Case studies from Rwanda, Tanzania and Zaire were presented. The
ecosystems in Rwanda and Tanzania have been affected and modified by human
activities over centuries. Ecosystems accustomed to intense human activity (such
as in the Rwandan and Tanzanian setting) appear to react better to the
consequences of population/livestock concentrations, than ecosystems that have
been less affected by human activity (e.g. Zaire). The carrying and recovery
capacities of various ecosystems is also affected by the duration of
population/livestock concentrations. Recovery of affected ecosystems in general,
however, will depend on the intactness of humus and the presence of seeds and
seedlings in the ground once the period of stress is over.
Intervening factors which determine the carrying and recovery
capacity of an affected ecosystem include the fragility of the ecosystem; local
topography; local availability of energy sources; availability of pastures;
climatic conditions (heavy rainfall that may wash away topsoil); energy needs of
refugees; number and type of livestock; number of refugees; length of stay; and
rapidity in which an environmental operation is started.
The aim of an environmental operation initiated following
population displacements, therefore, should be to safeguard the physical and
socio-economic environment, and focus on the local community to ensure long term
sustainability.
The main recommendations that can be drawn from the case-studies
include:
· where humanitarian
crises can be expected, maps indicating areas with fragile ecosystems should be
prepared;
· environmental considerations
should be included in the very beginning of a crises. It is recommendable to
include an environmental expert in the initial assessment team;
· the local population should be
involved in planning the use of land from the very beginning. Efforts should be
made to ask people how they want to use the
land.