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LU8: LANDUSE AND ITS IMPACT ON INLAND WETLANDS (Values of wetlands (food,…
LU8: LANDUSE AND ITS IMPACT ON INLAND WETLANDS
Physical Changes
Dam & impoundment building
purpose
hydroelectric power
water storage
effects
Hydraulic modifications
Increase in mecury levels in fishes
Changes in DO, nutrients and suspended solids concentration
release of greenhouse gases
temperature alteration
wetland destruction
Functions
shoreline stabilization
flood-peak reduction
ground water recharge
filters, transformers &sinks for materials produced by human activities
riparian wetlands as nurseries and food resources for young fishes
role of microorganisms& vegetation in C, N, S cycle between soil & atmosphere
types
urban developement
highway constructions
agriculture
diversion of stormwater & wastewater
forestry
global warming
causes
CO2
fossil fuels
burning of forests
CH4
wetlands
paddy fields
termites
domesticated animals
effects
increase rate of evaporatransiration
reduction in water flows
streams become warmer
longer dry period for small streams
longer ice-free periods for lakes, warmer waterm deeper thermocline
Biological changes
introduction of exotic species intentionally
unintentional introduction of species
Chemical Changes
major impacts
Loss of DO
Cultural eutrophication
symptoms
management strategies
Accumulation of toxic pollutants
sources
waste discharges
urban & agricultural runoff
Sources of pollution
point
non-point
Function of wetlands
chemical
waste treatment
biogeochemical cycling
physical/hydrological
flood control
coastal protection
ground water recharge
sediment traps
atmosperic equilibrium
biological
nurseries
habitat
migration
Values of wetlands
food
fuel
commercial animal populations
timber/fibre production
recreation, aesthetics, education
RAMSAR Convention
Conservation
wise use