[Some ecological impacts of Eucalyptus camaldulensis plantation]
1990
Pitaya Petmak | Bopit Kietvuttinon | Boonchoob Boontawee
The study on some ecological impacts of planting Eucalyptus camaldulensis in agricultural area was conducted during 1978 to 1986 at Huay Tha Silvicultural Research Station, Sisaket Province, Northeast Thailand. It involved comparing with Acacia auriculiformis under the practice of agroforestry land-use system. The obvious results drawn from this study during the four and eight years rotations are shown that Eucalyptus camaldulensis gave no harmful effects on the site and crop yields compared to A. auriculiformis during the four years rotation. Crop yields gained from the Eucalyptus plot were higher than the Acacia plot. They were due to the considerable large amount of annual nutrients uptake with the amount of two times provided by Acacia compared to Eucalyptus plot. Eucalyptus showed the significant decrease of corn yield at eight years and was lower than the yield gained by Acacia. Corn yield was also increasing to a significantly higher rate of nutrients return to the soil by the Acacia with the amount of 48.38 % compared to 32.67 % provided by Eucalyptus plot at the 8 years period. However, the yield of peanut was higher in Eucalyptus plot through the whole range of these studies period than the Acacia were. The harmful effects on soil productivity were not accounted greatly by Eucalyptus. Both tree species had the common effect on lowering the ground water table with the rate of 1.50 cm/day or decreasing 1.21 m of water table during the 3 months period in the dry season.
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