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 AJPS  Vol.8 No.13 , December 2017
Soil Seed Bank Phytosociology in No-Tillage Systems in the Southwestern Amazon Region
Abstract: Understanding the ecological dynamics of weed populations in no-tillage systems is important to establish strategies for integrated weed control capable of increasing agroecosystem sustainability. This study sought to evaluate the effect of succession systems on the seed bank in a no-tillage system. The effects of fifteen succession systems, composed of seven grasses, seven Leguminosae, and a fallow condition, were evaluated on the seed bank at two soil depths (0 to 10 and 10 to 20 cm). The species found in the seed bank were quantified and identified by species and family. The precision of sampling, density, dominance, the indices of diversity of Simpson and Shannon-Weiner; index of sustainability; analysis of groupings of dissimilarities; and the value of importance of each species were calculated. High weed diversity was observed; 29 species were counted, including members of 12 different families. The highest expression of weeds was observed at soil depths of 0 to 10 cm. The Simpson and Shannon-Weiner coefficients indicated high diversity in both systems of succession. The index of sustainability did not indicate significant alterations in the different systems of succession. The coefficients of confenetic correlation were 0.74% and 0.82% for the 0 - 10 and the 10 - 20 cm soil depths respectively. It is concluded that there is a high diversity of weeds in the agroecosystems of Amazonia, and different cover crops promote modifications in the community and expression of the weeds’ seed bank.
Cite this paper: Vargas, L. , Passos, A. , Marcílio, V. , Brugnera, F. , Leite, V. and Costa, R. (2017) Soil Seed Bank Phytosociology in No-Tillage Systems in the Southwestern Amazon Region. American Journal of Plant Sciences, 8, 3399-3413. doi: 10.4236/ajps.2017.813228.
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