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Carbon and nutrient dynamics in relation to growth rhythm in the giant bamboo Phyllostachys pubescens
R. Li, M.J.A. Werger, H.J. During and Z.C. Zhong
Plant and Soil
Vol. 201, No. 1 (April (I) 1998), pp. 113-123
Published by: Springer
Stable URL: http://www.jstor.org/stable/42948310
Page Count: 11
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The carbon and nutrient dynamics in relation to growth rhythm in the giant bamboo Phyllostachys pubescens on Mount Jinyun, Chongqing, China, was studied during 1993-1996. Concentrations of TNC (total non-structural carbohydrates), N, P, and K all showed the same distribution pattern among organs: leaves > branches ≥ rhizomes ≥ stems ≥ roots. The rapid spring growth of new shoots noticeably reduced the concentration of TNC in the rhizomes, in which a large amount of carbohydrates was stored. The N concentration of the rhizomes did not decrease, however. Nutrient concentration of new (1st-year) leaves was significantly higher than that of old (2ndyear) leaves. Although the density of adult shoots was almost the same during 1994-1996, the low ratio of the number of adult shoots with new to that with old leaves from June 1994 to April 1995 resulted in a low TNC concentration in the rhizomes in early spring (April) 1995. This led to a low production of new shoots in the spring of 1995, their number being only ca. 10% of that in 1994 and 1996. Before old leaves were shed, a large amount of nutrients was remobilized and translocated to other plant parts to support further growth. Fertilization with NPK significantly increased the concentrations of N and P in leaves and subsequently increased the number of emerging new shoots.
Plant and Soil © 1998 Springer