Litterfall and productivity of Eucalyptus camaldulensis in Thailand

Autor: Pongsak Sahunalu, Somchai Thoranisorn, Kyoji Yoda
Rok vydání: 1991
Předmět:
Zdroj: Journal of Tropical Ecology. 7:275-279
ISSN: 1469-7831
0266-4674
DOI: 10.1017/s0266467400005447
Popis: Eucalyptus camalduilensis Dehn. is a more important tree in tropical and warmtemperate countries than in its natural distributional range in Australia (Turnbull & Pryor 1984). This is because of its albility to grow in a wide range of conditions (temperature, rainfall, soil types and land form) as well as its rapid growth and ability to coppice. E. camaldutlenisis has been planted extensively over tlle last decade (Thaiutsa & Taweesuk 1987), for example in Spain, Portugal, Morocco, Argentina, Israel, and Mexico, the total area amounting to about 500,000ha (Turnbull & Pryor 1984). In Tlhailand, tl-he total area planted with E. camaldutlensis at the end of 1986 was 53,525 ha (Royal Forest Department 1987). The adaptable nature and high productivity of the tree are important economically for biomass production and re-afforestation particularly in tropical regions. For this paper, we studied the above-ground biomass productivity and litter production of five-year-old E. carnaldutlensis stands planted in 1983 at various stand densities. This was carried out at the Somdet forest plantation of the Forest Industry Organization in north-east Thailand (16? 40' N, 103? 30' E). The original vegetation of this area was dry evergreen forest. Study plots were set up on flat land at 230 mn altitude in the tropical monsoon zone with 1200 mm mean annual rainfall and 26.2?C mean anniual temperature. In June 1983, six-month-old seedlings of E. carnaldulensis were planted at different initial stand densities of 40,000, 17,778, 10,000, 4445, 2500, 1110 and 625 trees ha-' (plots A-G respectively). The experimental plots were 30 m x 30 m (A-D) and 40 m x 40 m for the remaining plots. DBH and height of surviving trees were measured in June 1988 (five-year-old, 50 sample trees for height measurement) and June 1989 (six-year-old). The number of trees measured in
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