LEAF EXPANSION OF THE DOMINANT WOODY SPECIES OF THREE DECIDUOUS OAK FORESTS IN NANJING, EAST CHINA

Research on species diversity in different gradients of altitudes, aspect and slope is attempting to understand the interactions of vegetation and the non-living environment. The aim of this study was to examine the impact of altitude, slope and aspect variation on the woody species diversity in the Oak forests of Zagros (northern of Iran). 178 samples were taken by using of transect method with a fixed length of 50 m. Altitude, slope, aspect, woody species and diameter at breast height of all trees was recorded in each transect. Margalef richness index, Shannon and Simpson diversity indices and Shannon evenness index were calculated. The Means of the different diversity indices were compared with Kruskal- Wallis test. Results showed that altitude had significant impact on the diversity, richness and evenness of woody species and the middle elevation class (1400 - 1600 m) allocated maximum values of indices. Also, the highest species richness was observed in the (0 - 20%) and (20 - 40%) slope classes but the slope hadn’t effected on the woody species evenness and diversity. The lowest amount of species richness was observed in the east aspect than other aspects. In general, it can be concluded that the altitude had a large proportion of diversity variation than slope and aspect in the research area.J. bio-sci. 23: 19-27, 2015

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Variation of bark thickness among woody species in a subtropical evergreen broadleaved forest, east China

Acta Ecologica Sinica ◽

10.5846/stxb201912202745 ◽

2021 ◽

Vol 41 (8) ◽

Author(s):

饶米德，徐紫薇，陈建华，倪健，米湘成，陈声文，方涛，叶铎 RAO Mide

Keyword(s):

Woody Species ◽

East China ◽

Bark Thickness ◽

Evergreen Broadleaved Forest

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Regeneration Dynamics and Development of Seedlings in Sessile Oak Forests in Relation to the Light Availability and Competing Vegetation

Forests ◽

10.3390/f12040384 ◽

2021 ◽

Vol 12 (4) ◽

pp. 384

Author(s):

Branko Kanjevac ◽

Milun Krstić ◽

Violeta Babić ◽

Zoran Govedar

Keyword(s):

Natural Regeneration ◽

Forest Regeneration ◽

Woody Species ◽

Ground Vegetation ◽

Oak Forests ◽

Canopy Openness ◽

Oak Forest ◽

Competing Vegetation ◽

Sessile Oak ◽

Oak Seedlings

Natural regeneration of sessile oak forests is a complex process whose final outcome is influenced by numerous factors. The initial phase of development of sessile oak seedlings stands out as the most critical period in the process of natural regeneration of sessile oak forests. As the available light and competition from the accompanying woody species and ground vegetation are some of the main predictors of the success of sessile oak forest regeneration, this paper presents the results of studying the influence of these factors on the regeneration dynamics and development of sessile oak seedlings. The research was conducted in sessile oak forests in northeastern Serbia in the period from 2015 to 2020. At the end of the growing season each year, the following data were collected on 180 smaller sampling plots of 1 m2 in different conditions of canopy openness: the number, height, and root collar diameter of sessile oak seedlings. Also, the percent cover of competing woody species and ground vegetation was estimated on these sample plots. The obtained results indicated that the success of sessile oak forest regeneration largely depends on the initial number of sessile oak seedlings and silvicultural treatments during the rejuvenation period, which determine the microclimatic conditions in the stand and control the competing vegetation. They also indicate that with an increase in the available light, the impact of the competing vegetation on the dynamics of regeneration and development of sessile oak seedlings is less pronounced. Accordingly, as young sessile oak seedlings need a large amount of light for survival and development, it is necessary to increase the available amount of light intensively in a short period of time (six–eight years) by reducing canopy openness and thus providing optimal conditions in which sessile oak seedlings can gain an advantage over the competing vegetation.

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