GROWTH AND BIOMASS ACCUMULATION OF SOME EARLY SUCCESSIONAL
WOODY SPECIES IN AN UPROOTED RUBBER FIELD AT KAMBURUPITIYA
H.K.P. Jayasekera and R. Senaratne
Department of Crop Science, Faculty of Agriculture,
University of Ruhuna, Mapalana Kamburupitiya.
A study was conducted on a successional vegetation in an abandoned uprooted
rubber field at Kamburupitiya in 1999. It involved determination of growth
parameters such as height, girth, biomass accumulation and partitioning
of dry matter in three most widely occurring early successional woody
species, namely Macarange peltata, Alstonia scholaris and Trema orientalis
of varying ages (3, 5 and 7 years). Here three trees of each species were
sampled except A. scholaris where only 3 and 5 year old trees were sampled
for each age class from each succeessional stand.
Growth parameters (height, gbh and rate of height and diameter), growth
of all three species at 3, 5 and 7 years and the partitioning of dry matter
to the leaves were compared among the three tree species and the ages
sampled. According to the results obtained A. scholaris showed the highest
absolute and relative stem elongation followed by M. peltata and then
T. orientalis. However it recorded the lowest rate of increment in girth.
At three years of age more dry matter is being partitioned to leaves and
as the age progressed this proportion is significantly reduced in all
the tree species sampled.
The implications of inter-specific variations in growth attributes and
accumulation and partition of dry matter on nutrient conservation and
restoration of disturbed agro-ecosystems are discussed.
Department of Forestry and Environmental Science,
of Sri Jayewardenepura,Sri Lanka. 1995-2000. All rights reserved.