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首页> 外文期刊>Southeastern naturalist >Current and historical composition and size structure of upland forests across a soil gradient in north Mississippi
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Current and historical composition and size structure of upland forests across a soil gradient in north Mississippi

机译：密西西比州北部土壤梯度上的旱地森林的当前和历史组成及规模结构

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Comparisons of current and historical tree species composition and size structure along natural productivity gradients are useful for inferring effects of disturbance regimes and productivity on patterns of succession. We tabulated occurrences and estimated diameters of 3483 General Land Office bearing trees across 19 survey townships along an upland soil texture and organic matter gradient in north Mississippi. We then contrasted this presettlement composition and structure with that of 2998 trees in sampling plots within present-day mature (> 100 years old) upland forests contained within the survey townships. Presettlement upland communities appeared to consist of non-successional communities, in which the most abundant trees were shade-intolerant, fire-tolerant trees (e.g., Quercus marilandica [blackjack oak]) in both large and small size classes across the entire soil gradient. These fire-prone presettlement assemblages differed greatly from present-day mature uplands, which were transitional assemblages of upland and floodplain trees, with mesophytic floodplain species (both early and late-successional) dominating the smaller size classes.
机译：沿自然生产力梯度对当前和历史树木物种组成和大小结构进行比较，有助于推断干扰状况和生产力对演替模式的影响。我们将密西西比州北部沿高地土壤质地和有机质梯度分布在19个被调查乡镇的3483棵普通土地办公室的树木的发生情况和估计直径制成表格。然后，我们在调查镇所包含的当今成熟（> 100年历史）的旱地森林的采样区中，将该预设组成和结构与2998棵树木的对比。预先定居的高地群落似乎由非成功群落组成，其中，在整个土壤梯度中，大小最大的树木中，最丰盛的树木是耐荫，耐火的树木（例如，栎栎）。这些容易发生火灾的沉降组合与当今成熟的高地大不相同，后者是高地和洪泛区树木的过渡性组合，中生洪泛区物种（早期和后期）均占较小规模。

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