Len Webb Ecological Images Collection
Images Arranged by Subject Category
Field Experiments
Field Experiments
"Checked" Silky Oak plantation as seen from outside: abundant regeneration of all local rainforest spp. EXCEPT Silky Oak.
Grimstone Plantation, Yarraman district, Queensland, 1965.Chlorosis, blackening, and deaths of Silky Oak seedlings in pots watered with leachates from Silky Oak seedlings in pots.
Grimstone Plantation, Yarraman district, Queensland, Early 1960s.Chlorosis, blackening, and deaths of Silky Oak seedlings in pots watered with leachates from Silky Oak seedlings in pots.
Grimstone Plantation, Yarraman district, Queensland, Early 1960s.Chlorosis, blackening, and deaths of Silky Oak seedlings in pots watered with leachates from Silky Oak seedlings in pots.
Grimstone Plantation, Yarraman district, Queensland, Early 1960s.Chlorosis, blackening, and deaths of Silky Oak seedlings in pots watered with leachates from Silky Oak seedlings in pots.
Grimstone Plantation, Yarraman district, Queensland, Early 1960s.Close-up of residual topsoil and leaf litter after rainforest clearing.
Mt. Glorious near Brisbane, Queensland, 1957.Experimental clearing in subtropical rainforest, monitored regularly since 1957.
Mt Glorious near Brisbane, Queensland, 1957.Experimental underplanting of Silky Oak seedling under Hoop Pine; growth is vigorous.
Grimstone Plantation, Yarraman district, Queensland, Early 1960.Experimental underplanting of Silky Oak seedling under Silky Oak: growth is stunted.
Grimstone Plantation, Yarraman district, Queensland, Early 1960.Field experimental site, Yarraman plantations, to study factors responsible for exclusion of seedling regeneration of the timber tree Grevillea robusta grown in monocultures.
Grimstone Plantation, Yarraman, Queensland, 1965.Further stage of "self-thinning" of Silky Oak seedlings shown in Image 9-56.
Grimstone Plantation, Yarraman district, Queensland, Early 1960s.Healthy Silky Oak seedlings established artificially under Hoop Pine plantation.
Grimstone Plantation, Yarraman district, Queensland, 1965.Litter tray used in measuring monthly leaf-fall in different rainforest types.
Whian Whian State Forest, New South Wales, Late 1950s.Self-thinning of densely spaced seedlings of Silky Oak in nursery beds is typical - see Image 9-57 for later stage.
Grimstone Plantation, Yarraman district, Queensland, Early 1960s.Shows differences in girth of Silky Oak trees in monoculture plantation (intra-species "root effects").
Grimstone Plantation, Yarraman district, Queensland, Early 1960s.Silky Oak seed germination trials under Hoop Pine plantation.
Grimstone Plantation, Yarraman district, Queensland, Early 1960s.Silky Oak seedlings planted under Hoop Pine plantation, for comparison of growth and vigour with that of seedlings planted under Silky Oak.
Grimstone Plantation, Yarraman district, Queensland, Early 1960.Silky Oak seedlings treated with leachates on left, control on right, indicating deleterious effects of the leachates.
Grimstone Plantation, Yarraman district, Queensland, Early 1960s.The Silky Oak plantation does not exclude natural regeneration, shown here, of any rainforest species except itself.
Grimstone Plantation, Yarraman district, Queensland, 1965.Thick undecomposed litter in Silky Oak plantation.
Grimstone Plantation, Yarraman district, Queensland, Early 1960s.View of Silky Oak (on left) and Hoop Pine (on right) plantations in which field experiments were carried out.
Grimstone Plantation, Yarraman district, Queensland, Early 1960s.Well established Grevillea robusta natural regeneration ca. 1 metre high under Hoop Pine plantation.
Grimstone Plantation, Yarraman district, Queensland, ca. 1960.Young natural regeneration of Grevillea robusta under Hoop Pine plantation.
Grimstone Plantation, Yarraman district, Queensland, ca. 1960.Field Experiments -- Glasshouse
Distinct chlorosis and beginning of blackening of Silky Oak seedlings watered by leachates from older plants of Silky Oak (upper pots).
Grimstone Plantation, Yarraman district, Queensland, 28 March 1962.Distinct effects of stunting and chlorosis of Silky Oak seedling treated wtih leachate from older Silky Oak plants.
Grimstone Plantation, Yarraman district, Queensland, 6 April 1962.Distinct effects of stunting and chlorosis of Silky Oak seedling treated with leachate from older Silky Oak plants.
Grimstone Plantation, Yarraman district, Queensland, 6 April 1962.Young saplings of Silky Oak used as source of leachate for watering Silky oak seedlings, causing their chlorosis, blackening and death.
Grimstone Plantation, Yarraman district, Queensland, 28 March 1962.