BANK OF WEED SEEDS IN AGROSYSTEMS IN THE BRAZILIAN CERRADO

Planta Daninha

CABRAL, P.H.R.¹  CARDOSO, I.S.¹  Instituto Federal do Norte de Minas Gerais, Salinas, Brasil¹  SOARES, M.P.¹  Universidade Federal do Espírito Santo, São Mateus, Brazil¹  JAKELAITIS, A.¹  Instituto Federal Goiano, Rio Verde, Brazil¹  MADALÃO, J.C.¹  ARAÚJO, V.T.¹ 

关键词: words: rainy season;    dry season;    Shannon index;    relative importance;    diversity;   

DOI  :  10.1590/S0100-83582016340300005

学科分类：农业科学（综合）

来源: Sociedade Brasileira da Ciencia das Plantas Daninhas (S B C P D) / Brazilian Society of Herb Science

【 摘 要 】

The seed bank is the reserve of viable seeds found in the soil and is related to diversity and abundance of species that make up the weed populations. This study aimed to determine the seed bank in four distinct environments (grazing area, area of vegetables, annual crop area and perennial crop area) in two seasons (rainy and dry season). To determine the seed bank, each environment was divided into four sub-areas of 0.2 hectares, considering that each area was a repetition, totaling 16 experimental units. Samples of 0.8 kg were taken from each area, and each sample was distributed on a plastic tray and allowed to germinate in a greenhouse. The density of the individuals was determined by observing the number of emerging seedlings in the trays, performing the counting at every 18 days. Evaluations were made for ninety days in each season. The germination curve was calculated, as well as the Shannon diversity index (H'), the Sorensen similarity index and the relative importance. The seven main species identified in the environments were Cyperus rotundus, Nicandra physaloides, Galinsoga parviflora, Alternanthera tenella, Panicum maximum, Portulaca oleracea and Eleusine indica. Among the studied environments, during the rainy season, the highest number of individuals was found in annual crop and the greatest diversity in the evergreen environment. During the dry season, the number and diversity of individuals were lower and similar in all environments.

【 授权许可】

Unknown