Relation between species composition and human disturbances in secondary deciduous broad-leaved forests in an agricultural landscape in the southeastern part of Jilin Province, Northeast China

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  • 中国東北部吉林省南東部の農村景観における落葉広葉樹二次林の種組成と人為的攪乱

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The relation between species composition or diversity and human disturbances in secondary deciduous broad-leaved forests was studied in an agricultural landscape in the southeastern part of Jilin Province, Northeast China. In 18 plots, diameter at breast height (DBH) of trees≧2m in height was measured, and phytosociological measurements were carried out on vascular plants. Phytosociological classification methods were applied to 18 vegetation samples. The forests were classified into the Quercenea mongolicae of the Querco-Fagetea crenatae, and the following two communities were identified: the Quercus mongolica-Crataegus pinnatifcda community (including two under units, two stand groups and two sub-stand groups), and the Quercus mongolica-Acer pseudo-sieboldianum community (including two under units). These two communities were distributed in a hilly region and a mountainous region, respectively. Further, disturbance in each of the under units or stand groups differed in quality and/or intensity, which was responsible for compositional differences among vegetation units. Correlations between species richness and intensity of disturbance made clear that species richness of woody liana and phanerophyte decreased with intensity of disturbances, and that of therophyte increased. Although species richness of geophyte was independent of disturbance, non-forest species of geophyte increased with intensity of disturbance. Therefore, disturbance found in the study area was responsible for the local extinction of woody species with long lifespan, and promoted the establishment of light demanding or shade intolerant herbaceous species, which contributed to differentiation of under unit.

Journal

  • Vegetation Science

    Vegetation Science 23 (1), 55-67, 2006

    The Society of Vegetation Science

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