Causal Loop PowerPoint

A Dynamic Systems Model
bedding pack
fraction
- +
manure conversion
factor
feed fraction
fraction of time in
pasture
R4
direct to compost
production rate
+ +
bedding pack to
compost production
rate
-
manure to compost
production rate
R3
B2
+
+
manure
production rate
+
+
animal feed
production rate
-
unfed biomass
production rate
+
+
Note: the red variables are
non-linear lookup (table,
graph) functions.
R5
+
+
pasture manure
production rate
above ground biomass
production rate
+
-
productivity of pasture
manure in producing
soil organic matter +
+
+
+
compost
production rate
direct and bedding pack
to to compost fraction
R6
+ + -
+
productivity of
compost in producing
soil organic matter
+
+
B3
+
soil organic matter growth
rate from pasture manure
soil organic matter
growth rate from
compost
+
soil organic matter
growth rate
+
+
R2
Soil Organic
Matter
R1
B1
biomass
production rate
+
soil organic matter
loss rate
+
+
root production
rate
+
+
root fraction of
biomass
production rate
soil organic matter
fractional loss rate
initial soil organic
matter
soil organic matter
growth rate from
biomass root die off
+
+
productivity of root die
off in producing soil
organic matter