Root morphology, growth and uptake of phosphorus and nitrogen of Pinus radiata families in different soils

• Published in: Forest ecology and management Vol. 56; no. 1; pp. 43 - 56
• Main Authors: Theodorou, C., Bowen, G.D.
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 1993; Elsevier
• Subjects: ABSORCION DE SUBSTANCIAS NUTRITIVAS; ABSORPTION DE SUBSTANCES NUTRITIVES; Adaptation to environment and cultivation conditions; Agronomy. Soil science and plant productions; ANATOMIA DE LA PLANTA; ANATOMIE VEGETALE; AZOTE; Biological and medical sciences; CRECIMIENTO; CROISSANCE; FOSFORO; Fundamental and applied biological sciences. Psychology; Genetics and breeding of economic plants; GROWTH; NITROGEN; NITROGENO; NUTRIENT UPTAKE; PHOSPHORE; PHOSPHORUS; PINUS RADIATA; PLANT ANATOMY; RACINE; RAICES; ROOTS; SOIL TYPES; TIPOS DE SUELO; TYPE DE SOL; Varietal selection. Specialized plant breeding, plant breeding aims; Australia; Genetic variability; Nutrition; Radiolabelling; Root; Growth; Soil fertility; Phosphorus; Pinus radiata; Sandy soil; Nitrogen; Nutrient uptake; Edaphic factor; Absorption; Genotype environment interaction; Morphology; Genetic improvement; Softwood forest tree; Gymnospermae; Coniferales; Spermatophyta; Intraspecific comparison; Soil plant relation; Greenhouse study; Podzol
• ISSN: 0378-1127; 1872-7042
• DOI: 10.1016/0378-1127(93)90102-S

Ten Pinus radiata D. Don families were grown in pots in the glasshouse for 1, and 4 months. The 1- and 2-month-old seedlings were used for 32P uptake experiments. The 4-month-old seedlings were grown in two different soils, Mt. Burr Sand and Terra Rossa, and their growth, root morphology and P and N uptake were measured. The uptake of 32P varied significantly between families and seedling age, and between the main root apex and laterals. The uptake by the laterals was significantly greater than that of the main root apex. There were also significant differences in the root morphology of the seedlings used in the 32P uptake. When the seedlings grew in different soils, both root and shoot growth varied significantly with family and soil. Shoot growth was correlated with root growth in both soils (Mt. Burr Sand, r=0.90; Terra Rossa, r=0.80; combined soils, r=0.92). There were significant differences between the families in the uptake of P and N from different soils and in the efficiency of utilization of these elements. The family which was best in these respects in one soil was not necessarily the best in the other. The Tallaganda Seed Orchard family was the best in growth and efficiency in Mt. Burr Sand and family 80 055 was best in Terra Rossa. The root morphology, as expressed by number of first- and second-order laterals, was correlated to the oven dry weight of plants, and the root oven dry weight was significantly correlated to the uptake of N and P.