Phytomasse et productivite primaire de peupleraies (Populus cv. robusta) d' ages differents (Hainaut, Belgique).
1994
Tsiourlis G.M.
In this paper are presented the living vegetal biomasses (phytomasses) and primary productivities of different ages (31,24 and 8 years) poplar's plantations in the limoneous countryside of Hainaut (central Belgium). The mean heights of the plantations are respectively 28, 25 and 8.5 m. Shrubs and herbaceous layers are quite nitrophilous. The 31 year old poplar's plantation has a total phytomass (dry mass) of 177 t per ha (159 t above ground and 18 t below ground) and a primary productivity of 30.5 t per ha and per year (28 t and 2.5 t); the 24 years old plantation has respectively 76.5 t per ha (68.5 t and 8 t) and 18 t per ha and per year (16.5 t and 1.5 t); and that of 8 years, 11 t per ha (9 t and 2 t) and 8 t per ha and per year (7.5 t and 0.5 t). Phytomasses and primary productivities for the poplar alone are respectively about 96 per cent and 86 per cent of the total in the plantation of 31 years old, 86 per cent and 66 per cent in that of 24 years; and only 2 t per ha and per year for the 8 years. True increments reach 24 t per ha and per year for the 31 years old plantation, 13 t per ha and per year for 24 years and 2 t per ha and per year for the 8 years. Photosynthetic efficacity of the oldest plantation (31 years) is 1.8 per cent.
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