Growth and Biomass Partitioning in Eucalyptus grandis Seedlings in Response to Nitrogen Supply

Cromer, R. N.; Jarvis, P.

doi:10.1071/pp9900503

Cited by 71 publications

(44 citation statements)

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“…The three-fold increase in foliar N concentration in the YFEL from N deficiency to N adequacy under glasshouse conditions was similar to that found in shoots of E. grandis seedlings (1 .2%-3 .4%) by Cromer and Jarvis (1990) . This sensitivity in the YFEL allowed standards to be set for the diagnosis of N deficiency and toxicity in E. globulus seedlings under these growing conditions .…”

Section: Discussion (I) Foliar N Concentrations In E Globulus Seedlsupporting

confidence: 55%

Diagnosis of nitrogen deficiency and toxicity of Eucalyptus globulus seedlings by foliar analysis

1995

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The relationship between shoot growth and foliar nitrogen (N) in E. globulus seedlings was studied in the glasshouse to determine standard values for N deficiency and toxicity diagnosis . Seedlings were grown for 9 weeks in yellow sand, at 10 rates of N, applied as ammonium sulphate, calcium nitrate or ammonium nitrate . Shoot dry weight (DW) increased linearly with N rate for all forms of N in the deficiency range . Seedlings continued to respond to higher rates of ammonium and ammonium nitrate than to nitrate . Maximum shoot DW for nitrate fed plants and ammonium nitrate fed plants were 51 % and 84% respectively of ammonium fed plants . Total N concentration in the youngest fully expanded leaf (YFEL) ranged from 1 .0% to 3 .3% in deficient and adequate plants . The critical N concentration for deficiency diagnosis (corresponding to 90% maximum yield) in the YFEL, determined from these growth response curves averaged over all N forms, was 2 .6% N. For ammonium nitrate fed plants, total N concentration in the YFEL for the severely deficient, deficient, adequate, and toxic ranges were < 1 .4%, 1 .4-2.5%, 2 .6-3 .5%, > 4.3% . High total N concentrations were associated with growth depression and toxicity symptoms, which differed with N form . For nitrate fed plants, a total N concentration above 3 .3% in the YFEL was associated with severe growth depression, and leaf tip necrosis . The adequate concentration range for ammonium nitrate was similar to values found on a field trial with 7 month old E. globulus trees grown on an exforest site .

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Section: Discussion (I) Foliar N Concentrations In E Globulus Seedlsupporting

confidence: 55%

Diagnosis of nitrogen deficiency and toxicity of Eucalyptus globulus seedlings by foliar analysis

1995

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“…A large increase in the C/N ratio was observed in shoots and coarse roots while in fine roots it was not significantly changed. This increase in C/N has been well documented (Brown, 1991;Williams et al, 1986) and has been attributed to a poor soil mineral content (Brown and Higginbotham, 1986;Cromer and Jarvis, 1990;Norby et al, 1986). This changes in the C/N ratio with time points towards an increasing nutrient impoverishment with elevated C02.…”

Section: Discussionmentioning

confidence: 76%

Effect of elevated CO2 on carbon and nitrogen distribution within a tree (Castanea sativa Mill.) — soil system

Rouhier¹,

Billès²,

Kohen

et al. 1994

Plant Soil

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Two-year-old sweet chestnut trees were grown outside in normal or double CO2 atmospheric concentration. In spring and in autumn of two growing seasons, a six day labelling pulse of lac labelled CO2 was used to follow the carbon assimilation and distribution in the plant-soil system. Doubling atmospheric CO2 had a significant effect on the tree net carbon uptake. A large proportion of the additional C uptake was 'lost' through the root system. This suggests that increased C uptake under elevated CO2 conditions increases C cycling without necessarily increasing C storage in the plant. Total root derived material represented a significant amount of the 'extra-assimilated' carbon due to the CO2 treatment and was strongly correlated with the phenological stage of the tree. Increasing root rhizodeposition led to a stimulation of microbial activity, particularly near the end of the growing season. When plant rhizodeposition was expressed as a function of the root dry weight, the effect of increasing CO2 resulted in a higher root activity. The C to N ratios were significantly higher for trees grown under elevated CO2 except for the fine root compartment. An evaluation of the plant-soil system nitrogen dynamics showed, during the second season of CO2 treatment, a decrease of soil N mineralization rate and total N uptake for trees grown at elevated CO2 levels.

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“…The forest industries in both Queensland and sub tropical New South Wales have included E. cloeziana and E. argophloia for plantation establishment (Keenan et al 1998). Knowledge of native eucalypt silviculture in these drought prone tropical and subtropical regions of Australia is limited to a few species and mainly to E. grandis (Doley 1978;Cromer and Jarvis 1990;Birk and Turner 1992) and E. camaldulensis (Blake 1980;Facanha et al 1983). An understanding of the relationship between physiological responses of E. cloeziana and E. argophloia and the biophysical environment (particularly water stress) is necessary for the development of silvicultural regimes.…”

Section: Introductionmentioning

confidence: 98%

Physiological responses to water stress in Eucalyptus cloeziana and E. argophloia seedlings

Ngugi

Doley

Hunt

et al. 2004

Trees

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Effects of water stress duration and intensity on gas exchange and leaf water potential were investigated in 7-month-old seedlings of a humid coastal provenance (Gympie) and a dry inland (Hungry Hills) provenance of E. cloeziana F. Muell. and in a dry inland (Chinchilla) provenance of E. argophloia Blakely supplied with 100% (T 100 ), 70% (T 70 ), 50% (T 50 ) of their water requirements, or were watered only after they were wilted at dawn (T 0 ). Seedlings of E. argophloia had the highest midday net photosynthetic rate (A), stomatal conductance (g s ), stomatal density and predawn leaf water potential (Y pd ) in all treatments. The E. cloeziana provenances did not differ in these attributes. The T 70 and T 50 treatments caused reductions in A of 30% in E. argophloia, and 55% in the E. cloeziana provenances. Under the T 0 treatment, E. argophloia maintained higher rates of gas exchange at all levels of water stress than E. cloeziana provenances. The estimates of Y pd and midday water potential (Y md ) at which plants remained wilted overnight were respectively: 2.7 and 4.1 MPa for E. cloeziana (humid), 2.8 and 4.0 MPa for E. cloeziana (dry) and, 3.7 and 4.9 MPa for E. argophloia. Following stress relief, both A and g s recovered more quickly in E. argophloia and in the dry provenance of E. cloeziana than in the humid provenance. We conclude that E. argophloia is more drought tolerant and has a potential for cultivation in the humid and semi humid climates, whilst E. cloeziana has greater potential in the humid subtropical climates.

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Growth and Biomass Partitioning in Eucalyptus grandis Seedlings in Response to Nitrogen Supply

Cited by 71 publications

References 0 publications

Diagnosis of nitrogen deficiency and toxicity of Eucalyptus globulus seedlings by foliar analysis

Diagnosis of nitrogen deficiency and toxicity of Eucalyptus globulus seedlings by foliar analysis

Effect of elevated CO2 on carbon and nitrogen distribution within a tree (Castanea sativa Mill.) — soil system

Physiological responses to water stress in Eucalyptus cloeziana and E. argophloia seedlings

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