Management rules and external factors - INRA Montpellier

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Management rules and external factors - INRA Montpellier

STANDARD

INPUTS (TREE)

Standard labour

inputs for a range of

tree management

activities

EXTERNAL

TIME-VARIABLE

BIOPHYSICAL

FACTORS

Global climate

change

External pest

pressure

STRATEGIC MANAGEMENT CHOICES

Tree species, row spacing, tree understorey

TACTICAL

MANAGEMENT

CHOICES (TREE)

Rules for weeding,

beating-up, pruning,

thinning, harvesting

and end of rotation

TACTICAL

MANAGEMENT

CHOICES (CROP)

Rules for crop species,

crop width, fertiliser

use, and end of planting

Net present value STANDARD

Tree

management

Tree-crop

interaction

Crop

management

Timber yield

at time i

Crop yield

at time i

OUTPUTS

Net present

value Net present value

Figure 1 : The structure of DMM in the HySAFE model

INPUTS (CROP)

Standard rates of

fertiliser, seed,

sprays and labour

rates

OPTIONS FOR

ECONOMIC

ANALYSIS

EXTERNAL TIME-

VARIABLE

ECONOMIC

FACTORS

Grants and

subsidies for crops

Grants and

subsidies for trees

Arable revenue,

Timber revenue

Arable related

costs, Forestryrelated

costs

Rules for allocation

of grants

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