preview

Pampa Biome

Decent Essays

The Brazilian Pampa is located between latitudes 28º00’ S and 34º00’ S and longitudes 49º30’ W and 58º00’ W, occupying an area of 63% of the Rio Grande do Sul State. The biome lies within the South Temperate Zone and has both subtropical and temperate climates with four well-characterized seasons. Grasslands, with sparse shrub and tree formations, are the dominant vegetation. Because of the natural grasslands, livestock production is one of the main economic activities (Roesch et al., 2009). Despite the ecological and economical importance, the anthropogenic land use in the Pampa biome have been changing the structure of natural plant and animal communities by the introduction of exotic species and conversion of natural areas into agricultural land. It is estimated that half of its original vegetation has been …show more content…

The management of agricultural land is considered one of the most significant human activities capable of changing the soil characteristics. Intensive agricultural practices are an important factor contributing to the degradation of soil properties (García-Orenes et al., 2009; Maitima et al., 2009) leading to lower levels of organic matter (Fliessbach et al., 2007; Schjønning et al., 2007) and changes in soil microbial diversity and activity (Nicol et al., 2003; Govaerts et al., 2007). Many studies have shown that land use determines the composition of soil bacterial communities (Wallenius et al., 2011; Osborne et al., 2011) and the bacterial communities are more sensitive to land use changes than the soil chemical and physical properties (Romaniuk et al., 2011). On the other hand, the use of land affected indirectly the bacterial community structure but it does not deplete bacterial diversity under the imposed environmental conditions (Jesus et al., 2009; Suleiman et al.,

Get Access