The Eupatoriun adenophorum Spreng appeared in southern Yunnan in 1960's is the weeds of the wasteland. In order to control it's harm a series of basic researches from the seed ecology to repjoductive characters was carried out. The effective preventive measures were put forword. The paper is based on autecolo -gy. Some results are reported as follows.1. The tiny seeds disperse mainly in the topsoil lees than 0.5cm deep. The rate of seed-sprouting is about 50%. They germinate best in the damp soils on pH.5-6 from June to July. They don't germinate in darkness.2. The buds of Eupatorium adenophorum are bred in the last of November. The flowers bloom in the late of February. The seeds ripen in April to May. Then, the plant partly dies and sprouts out new buds in May. The highest peak of nutritional growth is from June to September.3. Eupatorium adenophorum growing on fertile soil needs the moisture of soil, that is above 16%. the plant will stop permanently photosynthesis, when the moisture content of soil is below 15%. If it is below 11%, the plants will die completely.4. The growing activity of Eupctorium adencphorum depends on the temperature of 10℃ or more. If the average temperature of ten days is below 5℃ or absolute temperature is below -4.5℃.The parts above ground of the plant will suffer freezing harm. If average temperature of ten days is below 0℃ or the lowest is -10℃, the plant will die completely.5. According to photosynthelic character of Eupatorium adenophorum, it belongs to one of C3 plants.6. The reproductive capacity of Eupatorium cdenophorum is the strongest between 3rd-5th years of growing. Then, it comes down gradually every years. The sprouting ability of the separate rhizomes is strong. The pure roots haven't sprouting ability.
Acta Ecologica Sinica
Pamakani (Eupatcrium adenophorum), autecology, characters of biology and ecology.