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首页> 外文期刊>International journal of soil science >Soil Properties Influencing the Abundance and Distribution of Isoberlina Woodlands in Nigeria
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Soil Properties Influencing the Abundance and Distribution of Isoberlina Woodlands in Nigeria

机译：土壤性质影响尼日利亚伊索贝利纳林地的丰度和分布

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The influence of soil factors affecting the abundance and distribution of Isoberlinia woodlands in savanna ecosystem was studied. Fourteen woodland plots (ca 62 ha) were sampled systematically for frequency, density, basal area, crown cover and height of woody species ≥3 m high. Three soil pits were excavated in each woodland and soil physical, morphological and chemical properties described and analyzed, for each soil horizon. Results show that the soils are sandy loam to clay loam with dark grayish brown (10 YR 3/2) A-horizons over dark brown (7.5 YR 4/4) to yellowish red (5 YR) 4/6) subsurface horizons; moderate medium subangular blocky peds of friable consistence and contain large amounts of iron concretions. The pH is low with high mobile H+; low capacity for cation absorption and low mineral nutrients. Matrix of PCA scores of soil variables used to establish relationships between vegetation and soil parameters give very high significant values indicating the joint structural patterns between these two systems. Canonical correspondence analysis between the soil parameters (PCA) scores and species data elucidates the distribution and grouping patterns of Isoberlinia and its associes. Thus, variation in species composition in the woodlands reflects microsite differences in soil properties and their ecological amplitudes.
机译：研究了土壤因素对稀树草原生态系统中Isoberlinia林地的丰度和分布的影响。对14个林地（约62公顷）进行了系统采样，以获取频率，密度，基础面积，树冠覆盖率和高度≥3 m的木本物种的高度。在每个林地中开挖了三个土坑，并描述和分析了每个土层的土壤物理，形态和化学性质。结果表明，土壤是砂壤土到黏土壤土，深灰褐色（10 YR 3/2）A视界，深褐色（7.5 YR 4/4）到黄红色（5 YR）4/6）地表层。中度中等角度的块状小块，易碎稠密，含有大量的铁结石。 pH值较低，且流动性H + 高;阳离子吸收能力低，矿物质营养成分低。用于建立植被和土壤参数之间关系的土壤变量PCA分数矩阵给出了非常高的显着值，表明这两个系统之间的联合结构模式。土壤参数（PCA）得分与物种数据之间的典型对应分析阐明了伊索氏菌及其伴生的分布和分组模式。因此，林地中物种组成的变化反映了土壤性质及其生态幅度的微观位点差异。

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