# Spatial discontinuities and panarchy theory: for a better management of agriculture/forest interfaces

Marc Deconchat

► To cite this version:

Marc Deconchat. Spatial discontinuities and panarchy theory: for a better management of agriculture/forest interfaces. Resilience 2017: Resilience frontiers for global sustainability, Aug 2017, Stockholm, Switzerland. 1 p. hal-01607504

HAL Id: hal-01607504

https://hal.science/hal-01607504v1

Submitted on 5 Jun 2020

HAL is a multi-disciplinary open access
archive for the deposit and dissemination of sci-
entific research documents, whether they are pub-
lished or not. The documents may come from
teaching and research institutions in France or
abroad, or from public or private research centers.

L'archive ouverte pluridisciplinaire HAL, est
destinée au dépôt et à la diffusion de documents
scientifiques de niveau recherche, publiés ou non,
émanant des établissements d'enseignement et de
recherche français ou étrangers, des laboratoires
publics ou privés.

<figure><img src="image_1.png" /></figure>
<figure><img src="image_2.png" /></figure>

DYNAFOR
UMR 1201 | INRA - INP TOULOUSE

# Spatial discontinuities and panarchy theory : for a better management of agriculture/forest interfaces

## System dynamics: adaptive cycle

<figure><img src="image_3.png" /></figure>

Forest: slow system
Long K phase,
rare Ω phases (logging)

<figure><img src="image_4.png" /></figure>

<figure><img src="image_5.png" /></figure>

Crop: fast system
Short K phase,
frequent Ω phases (harvesting)

<figure><img src="image_6.png" /></figure>

Both habitats are influenced near their shared border.

Edge is the area of influence.

<figure><img src="image_7.png" /></figure>

<figure><img src="image_8.png" /></figure>

<figure><img src="image_9.png" /></figure>

Biodiversity, ecosystem services,
resource usages are modified by edge
effects.

Controlling edge effect is crucial for a
better land management

<figure><img src="image_10.png" /></figure>

<figure><img src="image_11.png" /></figure>

<figure><img src="image_12.png" /></figure>

## How do the slow and the fast systems spatially interact ?

During the **K** phase, the connectedness of the system increases: it influences its outside. During the other phases, the system is more open and is influenced by its outside:

- Strong influence may trigger Ω phase

- Lower influences contribute to α and τ phases, providing novelty and resources

<figure><img src="image_13.png" /></figure>

Spatial interface of the complex system

Forest influences crop dynamics
most of the time (long K phase).

Crop may influence forest
dynamics during regeneration
phases (Ω, α, r)

<figure><img src="image_14.png" /></figure>

INRA
SCIENCE & IMPACT

Centre Toulouse Midi Pyrénées
Chemin de Borde Rouge
CS 52627 • 31326 Castanet-Tolosan cedex
Tél : +33(0) 562 28 50 20

<figure><img src="image_15.png" /></figure>

Alimentation

<figure><img src="image_16.png" /></figure>

Agriculture

<figure><img src="image_17.png" /></figure>

Environnement