Savanna soil fertility limits growth but not survival of tropical forest tree seedlings
Savanna soil fertility limits growth but not survival of tropical forest tree seedlings
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稀树草原土壤肥力限制了热带森林树苗的生长，但不限制其生存
DOI：
10.1007/s11104-011-0879-7
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发表时间：
2011
期刊：
影响因子：
4.9
通讯作者：
R. Oliveira
中科院分区：
文献类型：
--
作者：
R. Viani;R. Rodrigues;T. Dawson;R. Oliveira
背景与目的巴西东南部的Cerradão(巴西林地稀树草原)和季节性干燥森林(SDF)在相同的气候下出现，但物种组成明显不同。本研究的目的是评估土壤来源在树种的初始生长和分布中的作用。方法在温室条件下，在土壤和不同植被类型的土壤上种植树苗。结果尽管SDF土壤养分有效性较高，但土壤来源对苗木成活率没有影响。这三个SDF树种表现出自家土壤的优势，随着土壤养分有效性的增加而促进生长，甚至在Cerradão土壤上的生长速度也高于Cerradão树种。Cerradão树苗在Cerradão土壤上的生长量不高，总体上与土壤养分有效性不呈正相关。结论SDF树种是速生树种，而Cerradão树种是生长缓慢的树种。尽管稀树草原土壤减少了森林物种的生长，但我们的发现表明，土壤的化学属性本身并不排除在Cerradão出现SDF幼苗，反之亦然。
Background and AimsCerradão (Brazilian woodland savannas) and seasonally dry forests (SDF) from southeastern Brazil occur under the same climate but are remarkably distinct in species composition. The objective of this study was to evaluate the role of soil origin in the initial growth and distribution of SDF and Cerradão species.MethodsWe conducted a greenhouse experiment growing Cerradão and SDF tree seedlings over their soil and the soil of the contrasting vegetation type. We evaluated soil nutrient availability and seedling survivorship, growth and leaf functional traits.ResultsDespite the higher nutrient availability in SDF soils, soil origin did not affect seedling survivorship. The three SDF species demonstrated home-soil advantage, enhanced growth with increasing soil nutrient availability and had higher growth rates than Cerradão species, even on Cerradão soils. Growth of Cerradão seedlings was not higher on Cerradão soil and, overall, was not positively correlated with soil nutrient availability.ConclusionsSDF species are fast-growing species while Cerradão trees tend to be slow-growing species. Although savanna soil reduces growth of forest species, our findings suggest that soil chemical attributes, alone, does not exclude the occurrence of SDF seedlings in Cerradão and vice-versa.