WOLFRAM SYSTEMMODELER

Arable_Land_Dynamics

Arable land dynamics

Diagram

Wolfram Language

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SystemModel["SystemDynamics.WorldDynamics.World3.Arable_Land_Dynamics"]
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Information

This model quantifies the land that is being used to produce food, i.e., the arable land. The model contains three state variables, representing the potential arable land, i.e., land that could be developed to grow crop, but so far hasn't been developed; the arable land that is currently being used for agriculture; and finally, the land that is being used for urban development and industry (including mining). Some of the potential arable land is getting developed over time, whereas some of the arable land is being lost either to urban development or to erosion.

The arable land is measured in units of hectares.

Public Parameters (9)

arable_land_init

Value: 900000000.0

Type: Real (hectare)

Description: Initial arable land

avg_life_land_norm

Value: 1000

Type: Real (yr)

Description: Normal life span of land

inherent_land_fert

Value: 600

Type: Real (kg/(hectare·yr))

Description: Inherent land fertility

pot_arable_land_init

Value: 2300000000.0

Type: Real (hectare)

Description: Initial potential arable land

pot_arable_land_tot

Value: 3200000000.0

Type: Real (hectare)

Description: Total potential arable land

social_discount

Value: 0.07000000000000001

Type: Real (¹/yr)

Description: Social discount

t_land_life_time

Value: 4000

Type: Real (yr)

Description: Land life time

urban_ind_land_init

Value: 8200000.0

Type: Real (hectare)

Description: Initial urban and industrial land

urb_ind_land_dev_time

Value: 10

Type: Real (yr)

Description: Urban and industrial land development time

Connectors (8)

land_yield

Type: MassInPort

Description: Land yield

marg_prod_agr_inp

Type: MassInPort

Description: Development of marginally producing land

population

Type: MassInPort

Description: Population

ind_out_pc

Type: MassInPort

Description: Per capita annual industrial output

tot_agric_invest

Type: MassInPort

Description: Total investment in the agricultural sector

arable_land

Type: MassOutPort

Description: Arable land

urban_ind_land

Type: MassOutPort

Description: Land occupied by human dwellings and industry

fr_inp_al_land_dev

Type: MassOutPort

Description: Fraction of capital invested in agriculture allocated to the devlopment of arable land

Components (23)

Land_Devel_Rt

Type: RRate

Description: p.289 of Dynamics of Growth in a Finite World

Arable_Land

Type: Level2b

Description: p.279 of Dynamics of Growth in a Finite World

Land_Rem_Urb_Ind_Use

Type: RRate

Description: p.322 of Dynamics of Growth in a Finite World

Land_Erosion_Rt

Type: RRate

Description: p.318 of Dynamics of Growth in a Finite World

sink

Type: Sink

Pot_Arable_Land

Type: Level1b

Description: p.279 of Dynamics of Growth in a Finite World

Urban_Ind_Land

Type: Level1a

Description: p.322 of Dynamics of Growth in a Finite World

Land_Dev_Rt

Type: Land_Devel_Rt

Description: p.289 of Dynamics of Growth in a Finite World

Land_Rem_UI_Use

Type: Land_Rem_Urb_Ind_Use

Description: p.322 of Dynamics of Growth in a Finite World

Land_Er_Rt

Type: Division

Description: p.318 of Dynamics of Growth in a Finite World

Avg_Life_Land

Type: Gain

Description: p.316 of Dynamics of Growth in a Finite World

Dev_Cost_Per_Hect

Type: Tabular

Description: p.291 of Dynamics of Growth in a Finite World

Gain1

Type: Gain

Description: p.291 of Dynamics of Growth in a Finite World

Marg_Prod_Land_Dev

Type: Marg_Prod_Land_Dev

Description: p.312 of Dynamics of Growth in a Finite World

Fr_Inp_Al_Land_Dev

Type: Tabular

Description: p.311 of Dynamics of Growth in a Finite World

Div1

Type: Division

Description: p.311 of Dynamics of Growth in a Finite World

Land_Fr_Cult

Type: Gain

Description: p.278 of Dynamics of Growth in a Finite World

Urb_Ind_Land_Req

Type: Prod_2

Description: p.321 of Dynamics of Growth in a Finite World

Urb_Ind_Land_PC

Type: Tabular

Description: p.321 of Dynamics of Growth in a Finite World

S_Land_Life_Mlt_Yield

Type: S_Land_Life_Mlt_Yield

Description: p.317 of Dynamics of Growth in a Finite World

P_Land_Life_Mlt_Yield_1

Type: Tabular

Description: p.317 of Dynamics of Growth in a Finite World

P_Land_Life_Mlt_Yield_2

Type: Tabular

Description: p.318 of Dynamics of Growth in a Finite World

Gain2

Type: Gain

Description: p.317 of Dynamics of Growth in a Finite World

Used in Examples (11)

Scenario_11

SystemDynamics.WorldDynamics.World3

Influencing the future 10 years later

Scenario_10

SystemDynamics.WorldDynamics.World3

Influencing the future 20 years earlier

Scenario_9

SystemDynamics.WorldDynamics.World3

Combining the measures of Scenarios #6 and #8

Scenario_8

SystemDynamics.WorldDynamics.World3

More abundant non-recoverable natural resources, birth control, and stable industrial output

Scenario_7

SystemDynamics.WorldDynamics.World3

More abundant non-recoverable natural resources and birth control

Scenario_6

SystemDynamics.WorldDynamics.World3

More accessible non-recoverable natural resources, pollution control, land yield enhancement, erosion protection, and resource efficiency

Scenario_5

SystemDynamics.WorldDynamics.World3

More accessible non-recoverable natural resources, pollution control, land yield enhancement, and erosion protection

Scenario_4

SystemDynamics.WorldDynamics.World3

More accessible non-recoverable natural resources, pollution control, and land yield enhancement

Scenario_3

SystemDynamics.WorldDynamics.World3

More accessible non-recoverable natural resources and pollution control

Scenario_2

SystemDynamics.WorldDynamics.World3

More abundant non-recoverable natural resources

Scenario_1

SystemDynamics.WorldDynamics.World3

Original WORLD3 model