Species diversity of herb and shrub layers in gaps of a mixed conifer broad-leaved forest in Taiyue Mountain of Shanxi Province
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摘要: 该文用释压法结合经验判断出林隙的年龄,在准确测量林隙面积的基础上,检验了灌木和草本多样性的林隙边缘效应.结果表明:林隙草本和灌木多样性大于非林隙,草本多样性的林隙边缘效应不明显;林隙边缘灌木多样性在林隙形成的前期和后期大于实际林隙,在中期刚好相反.研究还表明:草本和灌木多样性与扩展林隙面积正相关;林隙草本多样性的增大过程是在形成初期迅速完成的,灌木多样性的增加在形成初期有迟滞;在中后期,林隙草本和灌木多样性与林隙年龄负相关;林隙对某些偶见种有安全岛的作用.Abstract: The gaps of forest gaps were estimated by the "press release" method and from experience.We studied the characteristics of edge effects of gaps in relation to diversity in the herb and shrub layers by accurately measuring the areas of forest gaps.Results show that the diversity index in gaps was higher than that in the closed forest.The edge effect of gaps on species diversity in the herb layer was not obvious.Species diversity in the shrub layer of gaps varied with age of the gap:during their first and last stages diversity was larger than that of canopy gap,but this trend was reversed during its middle stage.Species diversity in the herb and shrub layers was positively related to the size of gaps.The augment of species diversity in the herb layer was accomplished quickly and it was delayed in the shrub layer during its first stage.The species diversity index was negatively related to the age of the gap during the middle to last stages.Gaps are shelters for accidental species.
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Keywords:
- forest gap /
- species diversity /
- Taiyue Mountain
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