Levantamento fitossociol車gico e banco de sementes das comunidades infestantes em 芍reas com culturas perenes = Phyto-sociological survey and seed bank of weed communities in areas of perennial cultures

作者：Patricia Andrea Monquero; Andreia Cristina Silva

来源：Acta Scientiarum - Agronomy, 2007.

• banco de sementes
• valor de importancia
• dormencia
• quadrado inventario
• bank of seeds
• value of importance
• dormancy
• squared inventory

Com objetivo de conhecer a comunidade infestante em 芍reas de culturasperenes, foi realizado um estudo no inverno e ver o nas seguintes 芍reas agr赤colas: 1 - 芍rea cultivada com banana durante dois anos; 2 - 芍rea cultivada com eucalipto durante dois anos; 3 - 芍rea cultivada com p那ssego durante tr那s anos; 4 - 芍rea em pousio durante cinco anos.Para o levantamento da comunidade infestante foi utilizado o m谷todo do quadrado invent芍rio, sendo calculado o 赤ndice de valor de importancia de cada esp谷cie. Foram identificadas 23 esp谷cies de plantas daninhas, sendo que Brachiaria decumbens e Commelina benghalensis estavam presentes de maneira significativa em todas as 芍reas. A estimativa da quantidade de sementes vi芍veis foi feita pela germina o direta das sementes das amostras de solo por 60 dias. Na primeira avalia o, a quantidade de sementes vi芍veis por m2 foi maiornas seguintes 芍reas: eucalipto %26gt; banana %26gt; pousio %26gt; p那ssego. As fam赤lias dominantes foram Gramineae e Amaranthaceae. Na segunda avalia o, o resultado foi: pousio%26gt; p那ssego%26gt; banana%26gt; eucalipto e as fam赤lias dominantes foram Cyperaceae e Gramineae. This study aimed to understand the weeds in areas of perennial cultures. The experiment was conducted in the winter and summer at thefollowing agricultural areas: 1 每 an area where bananas were grown for two years; 2 每 an area where eucalyptus were grown during two years; 3 每 an area where peaches were grown for three years; 4 每 an area where nothing was grown for five years. In order to survey theweed community, the method of the square inventory was used, and the index for the degree of importance of each species was calculated. About 23 species of weeds were identified and Brachiaria decumbens and Commelina benghalensis were present in a significant way in all of the areas. The estimation for the amount of viable seeds was done by the direct germination of the seeds in the soil samples for 60 days. During the winter, the amount of viable seeds per m-2 was larger in the following areas: eucalyptus%26gt; banana%26gt; without cultivation %26gt; peach. The dominant families were Graminae and Amaranthaceae. In the second evaluation, the results were: without cultivation %26gt; peach %26gt; banana %26gt; eucalyptus. The dominant families were Cyperaceae and Graminae.