Soil-vegetation relationships in cerrados under different fire frequencies
Soil-vegetation relationships in cerrados under different fire frequencies
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DOI：
10.1007/s11104-008-9660-y
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发表时间：
2008-10-01
期刊：
影响因子：
4.9
通讯作者：
Batalha, Marco Antonio
中科院分区：
文献类型：
--
作者：
da Silva, Danilo Muniz;Batalha, Marco Antonio
火是一个重要的生态因素，通过选择植物种类和改变土壤养分含量来构建热带稀树草原，如塞拉多。在Emas国家公园，巴西中部，我们比较了土壤下三种不同的火制度和它们的关系，他们支持的cerrado物种。我们在每个地点收集了25个土壤和植被样本。我们发现土壤特性的差异（p < 0.05），与肥力和火灾频率呈正相关：在每年燃烧的网站，我们发现较高的有机质，氮和粘土值，而在保护网站，我们检测到较低的pH值和较高的铝值。我们还观察到植物群落结构的差异，在每个网站不同的植物区系组成。植物区系组成与沙地比例的相关性较大（组内相关系数=0.834）。不同的火灾频率增加了巴西塞拉多的环境异质性和β多样性。
Fire is an important ecological factor that structures savannas, such as the cerrado, by selecting plant species and altering soil nutrient content. In Emas National Park, central Brazil, we compared soils under three different fire regimes and their relationship to the cerrado species they support. We collected 25 soil and vegetation samples at each site. We found differences in soil characteristics (p < 0.05), with fertility and fire frequency positively related: in the annually burned site we found higher values of organic matter, nitrogen, and clay, whereas in the protected site we detected lower values of pH and higher values of aluminum. We also observed differences in plant community structure, with distinct floristic compositions in each site. Floristic composition was more related to sand proportion (intra-set correlation=0.834). Different fire frequencies increase environmental heterogeneity and beta diversity in the Brazilian cerrado.