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Table 3 Properties of the national forest inventory data used in the study. dau: department administrative unit. Since the inventory in method M1 was asynchronous between dau, periods in this method are overlapping

From: Unprecedented pluri-decennial increase in the growing stock of French forests is persistent and dominated by private broadleaved forests

 

First method of inventory (M1)

Second method of inventory (M2)

Period

1961–1979

1976–2004

2005–2014

Spatial sampling scale

Department administrative unit (dau)

National

Time interval between two inventories

12 years on average

Annual

Information on forest composition

No

Yes

Yes

Number of dau and inventories

74 dau × 1 inventory

5 dau × 2 inventories

1 dau × 1 inventory

69 dau × 2 inventories

20 dau × 3 inventories

All forests every year