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首页> 外文期刊>Agroforestry Systems >Planning tree species diversification in Kenya based on differences in tree species composition between farms. II. Analysis of tree niches.
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Planning tree species diversification in Kenya based on differences in tree species composition between farms. II. Analysis of tree niches.

机译：根据农场之间树种组成的差异，规划肯尼亚的树种多样化。二。分析树ni。

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摘要

Concerns exist about the limited diversity of tree species in agricultural landscapes. Complete tree inventories were carried out on 201 farms from four villages in western Kenya to establish whether significant differences in tree species composition existed between farms, and if so their magnitude and implications for new introductions and plantings. Novel types of ordination using the Hellinger ecological distance and polynomial Redundancy Analysis indicated wide heterogeneity between farms with respect to tree species composition of five niches, including homestead, cropland, fallow, woodlot, and external boundary (p ≤ 0.05). Multiple regression analysis confirmed the ordination results using the abundance of dominant species as the response variable. The relationship between location and species composition differed with those of two previous surveys. Methodological differences in sampling intensity, locations and time of sampling between these surveys could have caused the difference. The maps of spatial distribution of compositional types provided in the previous surveys were not confirmed, whereas villages were found to contain several farms with a species composition that was not typical of their village. Meaningful results about the species composition of a landscape should include several farms per village and use a sampling grid finer than 5×5 km2.
机译：人们担心农业景观中树木种类的多样性有限。对肯尼亚西部四个村庄的201个农场进行了完整的树木清单调查，以查明农场之间树木种类组成是否存在显着差异，如果存在，它们的大小和对新引进和种植的意义。使用Hellinger生态距离和多项式冗余分析的新型排序表明，在五个生态位的树种组成方面，农场之间的异质性很广，包括宅基地，农田，休闲地，林地和外部边界（p≤0.05）。多元回归分析使用优势物种的丰富度作为响应变量，确认了排序结果。位置和物种组成之间的关系与之前两次调查的关系不同。这些调查之间的抽样强度，抽样地点和抽样时间在方法上存在差异，可能造成了差异。先前调查中提供的组成类型的空间分布图未得到证实，而村庄中发现有几个农场，其农场的物种组成并非其村庄的典型特征。关于景观物种组成的有意义的结果应该是每个村庄都包括几个农场，并使用小于5×5 km2 的采样网格。

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