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Annals of Botany 79: 625-630, 1997
© 1997 Annals of Botany Company

Do Sprouting Tree Species on Erosion-prone Sites Carry Large Reserves of Resources?

A. SAKAI+, S. SAKAI and F. AKIYAMA

Laboratory of Plant Ecology, Biological Institute, Graduate School of Science, Tohoku University, Sendai, 980-77, Japan Plant Chemistry Laboratory, Department of Plant Breeding, National Grassland Research Institute, Nishinasuno, Tochigi, 329-27, Japan

Received July 16, 1996 ; Accepted December 19, 1996

Saplings ofEuptelea polyandra were studied to determine whether tree species found on unstable hillslopes of temperate, old-growth forests in Japan carry substantial storage materials for sprouting replacement genets, as is the case with resprouter species of fire-prone areas. Concentrations (% d. wt basis) of carbohydrates (starch, sucrose, glucose and fructose) contained in roots, stems and leaves were measured in summer and winter.E. polyandra saplings were compared with those ofQuercus serrata (a frequently sprouting tree), and those ofMallotus japonicus andIdesia polycarpa (rarely sprouting trees) in the same forest. Total concentrations of carbohydrates (the sum of starch, sucrose, glucose and fructose) in roots were lowest inE. polyandra in both summer and winter. In addition,E. polyandra had a lower ratio of root biomass to total plant biomass thanQ. serrata , but similar to that of the non-sprouting species,M. japonicus andI. polycarpa . On the other hand, the total concentration of carbohydrates in the above-ground parts were similar in the four species in both summer and winter. These results indicate thatE. polyandra had less long-term storage resources to implement sprouting, in spite of its apparent effectiveness in sprouting. We propose hypotheses to explain the reason whyE. polyandra stores a relatively small amount of resources for sprouting.

Carbohydrate concentration; Euptelea polyandra Sieb. et Zacc; ground-surface disturbance; Idesia polycarpa Maxim; Mallotus japonicus (Thunb.) Muell. Arg.; Quercus serrata Thunb.; resprouter; root dry weight ratio; soluble sugars; sprouting; starch


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