The damage profile of kerai payung (Filicium desipiens) in University of Sumatera Utara green space based on Forest Health Monitoring (FHM) method

The University of Sumatera Utara (USU) campus in Medan is a green space area with numerous social and environmental benefits. In the USU campus, trees were planted for providing inhabitant needs such as fresh air, pollutant absorber, medicine, wood, fuel, fiber, aesthetic, and food. One of the medicine, wood, and aesthetic species that grows on the USU campus is kerai payung (Filicium decipiens). Along with fallen trees and broken branches incidents, detection of kerai payung trees damage in the campus USU was needed to prevent undesirable incidents and provide recommendations for maintenance. This research aims to get information on the distribution and damage profile of Kerai payung. To determine and assess the damage profile, the Forest Health Monitoring (FHM) approach was used. Research showed that the Kere payung diameter structure ranges from 8 cm to 74 cm. Based on FHM, damage types of Kerai payung trees in USU campus are as follows; broken or dead branch, open wound, brum in branch, loss of dominant tips, leaves change color and konk. While the damage location is found in branches, buds and tips, lower and upper bole, leaves and upper bole. Our research pointed out that maintaining activities still be needed to avoid further damages.

Old Forests from Dobrogea’s Plateau

From the oldest times, the forest has been the main food, shelter and energy source, playing an essential role in the development of human societies. Old stands are characterized by their long life, large heights and diameters and by their help in conserving biodiversity. The surfaces occupied by old stands have decreased lately because of their wood mass high value which leads to exploitation. This is furthermore coupled with climate changes, urbanization and human influences. These stands occupy a surface of 128.500 ha in the forests from Dobrogea’s Plateau, where broad-leaved species are preponderant (Quercus sp., Fraxinus ornus, Tilia tomentosa, Acer sp.). As such, the present paper intends to characterize the oldest stands from Dobrogea’s Plateau with the help of forest management plans realized during 1993-2007. The main characteristics analyzed in this study for stands older than 120 years were: location, surface, height, diameter, structure, forest type, soil type, altitude, exposition, slope and consistency. Stand older than 100 years occupy only 4% of the total surface and are composed of linden, brown oak and pedunculate oak which grow and develop on common luvisols.

Comparison of tree diameter distributions in managed and unmanaged Kazdağı fir forests

Forest structural complexity affects tree growth, species diversity, understory seedling density, wildlife habitat and fire behaviour. Thus, defining the structural complexity of forest ecosystems would play a crucial role in their management. The vertical structure in stands of shade-tolerant tree species can be described by using the distribution of tree diameters. In this study, the main objective was to determine and compare the diameter distribution patterns of managed and unmanaged Kazdağı fir (Abies nordmanniana subsp. equi-trojani) forests in northern Turkey. Hierarchical clustering analysis was used to define the diameter distribution patterns. Three main diameter distribution patterns were examined in both managed and unmanaged forests. Two of the patterns in the managed forest did not possess the expected diameter structure of selection silviculture (i.e. reverse J-shape). The observed patterns in the unmanaged forest were mostly representative of the diameter structure of old-growth forests. Given the initial findings, it is likely that the small-scale disturbances created by selection methods may not be adequate to establish and recruit sufficient number of trees into small- diameter sizes in Kazdağı fir forests. The assessment of patterns of tree diameter distribution in these forests would create a basis for future research, aiming to enhance the structural complexity.

Dynamics of initial spacing on the diameter of hybrid Eucalyptus grandis x Eucalyptus urophylla in a systematic design

We evaluated the effect of initial spacing on the distribution of Eucalyptus grandis x Eucalyptus urophylla tree diameters in a Nelder wheel design. The study area was in west-central Brazil. A Nelder wheel design with three repetitions was used. This design provides 432 planting spots per plot/repetition. Planting density varied from 0.50 m² to 41.25 m². The diameter at breast height was measured for all plants every four months until 36 months of age, totaling eight measurements. The description of the diameter distribution was developed by fitting probability density functions for each spacing and age. The quality of fit was evaluated using the root mean square error percentage, Pearson’s correlation coefficient, and the Kolmogorov-Smirnov test (α < 0.05). The spacings up to 1.17 m² must be harvested in less than two years, since it is noted that in the third year the increment in diameter is static and the mortality rate increases. The spacing highly affects the diameter structure of the population, impelling the forester to consider different uses for the wood. For wood requiring larger diameters, spacing above 8.69 m² per tree is recommended

ASSESSING THE HEALTH OF THE CHETTABA FOREST (ALGERIA)

The establishment and interpretation of diameter and height structures are essential for forest management decisions. This study aims to describe the diameter structure and spatial distribution of Pinus halpensis populations in the Chettaba state forest (Constantine, Algeria). The knowledge of these parameters is an essential step for their sustainable management. The diameter at 1.30 m from the ground and the total height of P. halpensis individuals were measured on 6 plots along an altitudinal gradient. The height structure shows that trees in the height classes between 5 and 10m have a very high density, indicating low natural regeneration. The total structure indicates that smaller trees are more abundant than larger trees (17.5<d≤27.5cm). These results contribute to the improvement of knowledge on current condition indicators of natural Pinus halpensis stands that can be used as a basis in the management of Chettaba forest

Diameter Structure Changes in the Pre-Maturing Black Locust and Common Hackberry Stand in the Subotica-Horgoš Sands under the Influence of a Late Thinning

In this paper, a change of diameter structure in a pre-maturing stand of black locust and common hackberry under the influence of a late thinning is analysed. The research is based on three permanent experimental plots and two measurements of diameters in a five-year period. One of the plots is a control plot and two plots are experimental, where the thinning was carried out in a stand 28-years old, with the thinning intensity of 28.9–30.6% of the initial density, approximately evenly distributed across diameter classes. In the investigated stand common hackberry came from the neighbouring areas in the stand structure. The initial measurement in the autumn of 2014 confirmed the share of common hackberry of 16–18% in the total number of trees thicker than 5 cm with a dominantly reversed J shape of the diameter structure and the presence of trees in all the diameter classes. In the period of stand age from 28 to 33 years, a dominant process on all treatments was the mortality of thinner trees, while the recruitment of common hackberry trees was recorded in all treatments. On the control plot, a quarter of the trees died, while an eighth of the remaining trees died in the thinned plots, mostly black locust trees. In thinned plots, only black locust trees died with a characteristic that the intensity of mortality was higher in thinner trees, while in the control plot some thick black locust trees died, as well as and some thinner common hackberry trees. In the five-year period, numerical parameters of variability (standard deviation, coefficient of variation), the shape of distributions (skewness and kurtosis) and heterogeneity of diameters at breast height (Gini index, Lorenz asymmetry coefficient) have shown a trend of increasing variability and change of diameter distributions of trees in all treatments, but it is more expressed in thinned plots compared to the control plots. Growth dominance coefficient of diameters shows that the competition between the collectives of both species and the black locust collective is of asymmetric type and more expressed in the thinning treatments. In common hackberry trees on the control plot the competition between the trees is of asymmetric type, while on the thinned plots, the competition is of symmetric type. This shows that after thinning, common hackberry has a biological potential that is higher than that of black locust and that the natural succession can be accelerated through thinnings.

PENGARUH KOMPOSISI MEDIA TERHADAP PERTUMBUHAN KALUS DAN KADAR TANNIN DARI DAUN JATI BELANDA (Guazuma ulmifolia Lamk) SECARA IN VITRO

<p>ABSTRAK</p><p>Jati belanda (Guazuma ulmifolia Lamk.) merupakan salah satu jenistanaman penghasil senyawa tannin yang berkhasiat sebagai obat untukobesitas. Tannin dapat diproduksi secara in vitro dan kadarnya dapatditingkatkan melalui kultur kalus. Komposisi media yang tepat sangatdiperlukan agar dihasilkan kalus dengan pertumbuhan cepat dan optimal.Penelitian ini bertujuan untuk memperoleh komposisi media terhadappertumbuhan kalus dan kadar tannin secara in vitro. Bahan tanaman yangdigunakan adalah daun muda yang berasal dari tanaman di rumah kaca danberumur dua tahun. Media dasar yang digunakan adalah Murashige danSkoog (MS) yang diperkaya dengan vitamin dari group B. Perlakuan yangdiuji adalah media dasar MS + 2,4-D (0,1; 0,3; 0,5 mg/l) secara tunggaldan kombinasinya dengan Benzyl Adenin/BA ( 0,1 dan 0,3 mg/l).Parameter yang diamati adalah pertumbuhan kalus yang meliputi diameter,struktur, warna kalus, bobot basah kalus, serta visual kalus selamapengkulturan. Rancangan yang digunakan adalah acak lengkap polafaktorial dengan sepuluh ulangan. Analisis kandungan tannin dilakukandengan mengeringkan kalus in vitro dan sampel daun dari lapang danselanjutnya diekstrak. Hasil penelitian menunjukkan bahwa terdapatinteraksi antara perlakuan 2,4-D 0,3 mg/l yang dikombinasikan denganBenzyl Adenin 0,1 mg/l terhadap ukuran diameter kalus terbesar yaitu28,7 mm, diameter kalus terbesar setelah sub kultur yaitu 31,9 mm, danberat basah kalus yaitu 5,02 g. Kandungan tannin pada semua perlakuankalus in vitro (3,72 – 4,27%) lebih tinggi dari pada tannin yang terdapatpada daun (2,24%).</p><p>Kata kunci : Guazuma ulmifolia Lamk, jati belanda, induksi kalus,kandungan tannin, in vitro</p><p>Effect of Medium Composition on Calli Growth andTannin Content from Leaves of West Indian Elm(Guazuma ulmifolia Lamk.) through in vitro Culture</p><p>ABSTRACT</p><p>West Indian Elm ( Guazuma ulmifolia Lamk.) is one of potentialplant producing tannin which is useful for controlling obesity. Tannin canbe produced through in vitro and this compound could be increased bycalli culture. The medium composition for calli induction was necessary toproduce the optimal calli. The aim of this research was to obtain themedium composition for calli induction through in vitro. Young leaves ofWest Indian Elm from glass house were used as explants. Murashige andSkoog (MS) medium enriched with B vitamin group was used as basicmedium. The experiments were arranged in completely randomized designin factorial pattern with ten replications. For calli induction, variousconcentration of 2,4-D (0.1; 0.3; and 0.5 mg/l) and its combination withBenzyl Adenin of 0.1 and 0.3 mg/l were used as treatments. Parametersobserved were calli diameter, structure, colour, fresh weight andperformance during culture. Analysis of tannin was conducted by usingdried samples both (in vitro and leaves from glass house) and thenextracted. The result showed that there was interaction between 2,4-D 0.3mg/l and Benzyl Adenin 0.1 mg/l on calli diameter (28.7 mm), the biggestcalli diameter after sub culture (31.9 mm), and fresh calli weight (5.02 g)eight weeks after treatments. Tannin content obtained from all of the invitro treatments (3.72 – 4.27%) was higher than tannin from leaves(2.24%).</p><p>Key words : Guazuma ulmifolia Lamk., West Indian Elm, calli induction,in vitro, tannin content</p>