Dynamics of weed communities in an experimental shifting cultivation site in northeast Thailand.

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Dynamics of weed communities in experimental shifting cultivation plots during the two years following the felling of the forest were investigated. The experimental site is located in northeast Thailand and maize was used as a crop. Eupatorium odoratum was the most dominant species in the shifting cultivation plots during the two year period studied. Yearly burning, however, depressed its regrowth. On the contrary, Ageratum conyzoides conspicuously increased in the second year. When weed species were periodically removed, Crassocephalum rubens became the dominant species. In the first year, a great number of individuals of C. rubens developed in the improved plots where plowing, manuring and weeding were done. In the second year, E. odoratum remarkably increased while A. conyzoides dominated in the non-weeded plot under improved conditions. During the first year after the felling of the forest, few grass weeds appeared. The floristic composition of buried seeds in the soil changed with the duration and/or method of cultivation.
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