34.6 Landscape and Patch Dynamics Model Equations
FIREYEARS_2(t) ¼ FIREYEARS_2(t À dt) + (ADD__FIRE_YEARS_2
À OUT_2) * dt
INIT FIREYEARS_2 ¼ 0
INFLOWS:
ADD__FIRE_YEARS_2 ¼ if (time > 1) and (((random(0,1))^2 > ABS
(D_OPEN_2))) then 1 else 0
OUTFLOWS:
OUT_2 ¼ if FIRE_2¼1 then FIREYEARS_2 else 0
FIREYEARS_7(t) ¼ FIREYEARS_7(t À dt) + (ADD__FIRE_YEARS_7 À
OUT_7) * dt
INIT FIREYEARS_7 ¼ 0
INFLOWS:
ADD__FIRE_YEARS_7 ¼ if (time > 1) and (((random(0,1))^2 > ABS(D_OPEN_7)))
then 1 else 0
OUTFLOWS:
OUT_7 ¼ if FIRE_7¼1 then FIREYEARS_7 else 0
FIRE_YEARS(t) ¼ FIRE_YEARS(t À dt) + (ADD__FIRE_YEARS À OUT) * dt
INIT FIRE_YEARS ¼ 0
INFLOWS:
ADD__FIRE_YEARS ¼ if (time > 1) and (((random(0,1))^2 > ABS(D_OPEN)))
then 1 else 0
OUTFLOWS:
OUT ¼ if FIRE¼1 then FIRE_YEARS else 0
FIRE_YEARSS_3(t) ¼ FIRE_YEARSS_3(t À dt) + (ADD__FIRE_YEARS_3 À
OUT_3) * dt
INIT FIRE_YEARSS_3 ¼ 0
INFLOWS:
ADD__FIRE_YEARS_3 ¼ if (time > 1) and (((random(0,1))^2 > ABS(D_OPEN_3)))
then 1 else 0
OUTFLOWS:
OUT_3 ¼ if FIRE_3¼1 then FIRE_YEARSS_3 else 0
FIRE_YEARSS_9(t) ¼ FIRE_YEARSS_9(t À dt) + (ADD__FIRE_YEARS_9 À
OUT_9) * dt
INIT FIRE_YEARSS_9 ¼ 0
INFLOWS:
ADD__FIRE_YEARS_9 ¼ if (time > 1) and (((random(0,1))^2 > ABS(D_OPEN_9)))
then 1 else 0
OUTFLOWS:
OUT_9 ¼ if FIRE_9¼1 then FIRE_YEARSS_9 else 0
FIRE_YEARS_4(t) ¼ FIRE_YEARS_4(t À dt) + (ADD__FIRE_YEARS_4 À
OUT_4_4) * dt
INIT FIRE_YEARS_4 ¼ 0
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34 Two-Species Colonization Model