scholarly journals UNDERGROWTH PHYTOMASS IN THE SECONDARY DECIDUOUS STANDS OF THE MIDDLE TAIGA

2020 ◽  
Vol 10 (1) ◽  
pp. 60-68
Author(s):  
Tat'yana Pristova
Keyword(s):  
Organic Matter ◽  
Middle Taiga ◽  
Individual Species ◽  
Salix Caprea ◽  
Forest Phytocenoses ◽  
Long Time ◽  
Young Forests ◽  
Salix Pentandra ◽  
Succession Stage

The determination of organic matter reserves by forest phytocenoses is important in assessing biological produc-tivity of deciduous plantations formed at felling. As a rule, phytomass of the stand and soil cover is given when assess-ing forest productivity. This indicator is rarely determined for the undergrowth. The deciduous phytocenoses of the middle taiga, formed at the cutting of spruce of myrtillus type, have been studied. The undergrowth of the studied phy-tocenoses is represented by six species of woody plants: Salix caprea L., Sorbus aucuparia L., Rosa acicularis Lindl. and Lonicera pallasii Ledeb. Besides the mentioned species, Salix pentandra L. and S. philicifolia L are found in birch and spruce young growths. The method of “model trees” using allometric equations and the method of the “middle tree” for estimating the mass of individual species were used to determine the undergrowth phytomass. The specifics of the undergrowth phytomass dynamics in the studied after-cutting phytocenoses is associated with the overgrowing of felling by forest-forming and undergrowth species at the same time. It subsequently leads to competition between them. According to the studies in birch and spruce young forests, the undergrowth phytomass of decreased from 8.8 to 4.7 t/ha over 10 years; in aspen-birch stands - from 4.0 to 3.8. Throughout the entire studied period, fractions, accumulating organic matter (trunks and branches) for a long time, prevail in the undergrowth phytomass. The mass of leaves is 6-8% of the total undergrowth phytomass. The dynamics of the accumulation of organic matter by undergrowth is determined by biological characteristics of the species that form it, their abundance, natural thinning, and succession stage of the secondary stands.

scholarly journals DETERMINATION OF SEDIMENTATION RATES OF THE POLLEN CLUSTERS OF ANEPHILOUS PLANTS GROWING IN THE CSBG SB RAS

2019 ◽  
Vol 4 (2) ◽  
pp. 172-180
Author(s):  
Vladimir Golovko ◽  
Konstantin Khlebus ◽  
Anastasia Belanova
Keyword(s):  
Chenopodium Album ◽  
Pollen Grains ◽  
Sedimentation Rates ◽  
Number Of Clusters ◽  
Salix Caprea ◽  
The Russian Federation ◽  
Plantago Media ◽  
The Individual ◽  
Salix Pentandra

A study is made on the sedimentation of pollen particles of the anemophilous plants of six species (Salix caprea L., Salix pentandra L., Betula davurica Pall., Plantago media L., Chenopodium album L.,Artemisia sieversiana Willd.), growing in the CSBG SB RAS. These species are widely represented in the biocenosis of the Russian Federation and are the producers of substantial amounts of allergenic pollen which can be carried by winds over great territories. It is shown that there is a considerable number of clusters that contain two and more pollen grains. Sedimentation rates are determined of both the individual pollen grains of these plants and their clusters with 2-6 pollen grains. It has been established that the sedimentation rate of clusters depends on the number of the pollen grains contained.

scholarly journals KEANEKARAGAMAN JENIS POHON PENYUSUN VEGETASI DI HUTAN RAWA GAMBUT PADA KAWASAN HUTAN LINDUNG GUNUNG AMBAWANG KECAMATAN KUBU KABUPATEN KUBU RAYA

2019 ◽  
Vol 7 (3) ◽  
Author(s):  
Bayu Aji Prasetyo ◽  
Togar Fernando Manurung ◽  
Hafiz Ardian
Keyword(s):  
Organic Matter ◽  
Species Diversity ◽  
Forest Floor ◽  
Systematic Sampling ◽  
Swamp Forest ◽  
Forest Protection ◽  
Peat Swamp Forest ◽  
Peat Swamp ◽  
Long Time

Peatland is a weatland ecosystem formed by the accumulation of organic matter on the forest floor from the debris of the vegetation above it for a long time. This process occurs because of the slow rate of decomposition compared to the rate of deposition of organic matter on the wet/inundated forest floor. This study aims to determine the vegetation species diversity found in the peat swamp forest of the area of Gunung Ambawang protected forest in Kubu Sub-District of Kubu Raya Regency. The method used in this study is a plot method with the initial determination of the plot carried out through purposive sampling then the other plots were carried out by systematic sampling. Observation of forest compositionwas made in 5 (five) observation plots, with a length of 200 m, width of each plot being 20 m and distance between plots 100 m. The research found 39 species of vegetation dominated by medang species (Litsea sp) of the Lauraceae family, which is the most common vegetation found in the peat swamp forest area in the protected forest og Gunung Ambawang.Keywords: peat swamp forest, protection forest, species diversity

Tingkat Pemahaman Kompetensi Guru Pada Mahasiswa Pendidikan Geografi Sebagai Calon Guru Geografi

2020 ◽  
Vol 21 (1) ◽  
pp. 102-117
Author(s):  
Novia Zalmita ◽  
Muhajirah Muhajirah ◽  
Abdul Wahab Abdi
Keyword(s):  
Prospective Teachers ◽  
Prospective Teacher ◽  
Quantitative Description ◽  
Population Data ◽  
Geography Education ◽  
Teacher Competence ◽  
Education Department ◽  
Long Time

One that influences human resource indicators is education. The teacher is a profession as a job of academic specialization in a relatively long time in college. Understanding related to teacher competence is very important to have by a prospective teacher because it can affect the quality of performance as a professional teacher. The teacher's competence is known as pedagogic, professional, social and personality competencies. The issue in this study is how the competency of the teacher of the Department of Geography Education FKIP Unsyiah as a prospective teacher of geography? The purpose of this study was to determine the competence of teachers in the Department of Geography Education FKIP Unsyiah as prospective geography teachers. Quantitative description approach is used in this study to find answers to the issue. The population in this study were students of the Department of Geography Education FKIP Unsyiah class of 2015 and 2016 who had been declared to have passed the Micro Teaching and Magang Kependidikan 3 course totaling 50 people. Because the population is small and can be reached, the determination of the sample using total sampling techniques so that the sample in this study is the whole population. Data collection is done by distributing test questions to respondents. The data was analyzed using the descriptive statistics percentage formula. The results of the study indicate that the level of teacher competence of Geography Education Department students as prospective teachers is in the moderate category, namely as many as 22 respondents (44%). A total of 12 respondents (24%) were in the high category, 15 respondents (30%) were in the low category and 1 respondent (2%) were in the very low category.

Assessment of recreational use of specially protected natural territories of Tatishchevsky district of Saratov region

2019 ◽  
Vol 27 (2) ◽  
pp. 117-127
Author(s):  
Yulia M Andriyanova ◽  
Irina V Sergeeva ◽  
Yulia M Mokhonko ◽  
Natalia N Gusakova
Keyword(s):  
Natural Resources ◽  
Protected Areas ◽  
Saratov Region ◽  
Future State ◽  
Forest Phytocenoses ◽  
Long Time ◽  
Main Components ◽  
First Time ◽  
Recreational Use ◽  
Specially Protected Natural Territories

The influence of recreation being a set of measures to restore health and recreation, on the main components of forest phytocenoses in specially protected natural territories of the Tatishchevsky district of the Saratov region has been studied for the first time. These phytocenoses have been intensively used for tourism for a long time. The intensity and visits activity of protected areas has been determined; the recreational capacity of territorial objects has been studied. The degree of forest landscapes has been revealed in specially protected natural territories. The findings allow predicting the future state of the natural resources of the Saratov region and can be taken into account when assessing their optimal use.

scholarly journals Expression Level of Mature miR172 in Wild Type and StSUT4-Silenced Plants of Solanum tuberosum Is Sucrose-Dependent

2021 ◽  
Vol 22 (3) ◽  
pp. 1455
Author(s):  
Varsha Garg ◽  
Aleksandra Hackel ◽  
Christina Kühn
Keyword(s):  
Solanum Tuberosum ◽  
Wild Type ◽  
Potato Plants ◽  
Mature Leaves ◽  
In Vitro Plantlets ◽  
Long Time ◽  
Short Time ◽  
Cut Leaves

In potato plants, the phloem-mobile miR172 is involved in the sugar-dependent transmission of flower and tuber inducing signal transduction pathways and a clear link between solute transport and the induction of flowering and tuberization was demonstrated. The sucrose transporter StSUT4 seems to play an important role in the photoperiod-dependent triggering of both developmental processes, flowering and tuberization, and the phenotype of StSUT4-inhibited potato plants is reminiscent to miR172 overexpressing plants. The first aim of this study was the determination of the level of miR172 in sink and source leaves of StSUT4-silenced as well as StSUT4-overexpressing plants in comparison to Solanum tuberosum ssp. Andigena wild type plants. The second aim was to investigate the effect of sugars on the level of miRNA172 in whole cut leaves, as well as in whole in vitro plantlets that were supplemented with exogenous sugars. Experiments clearly show a sucrose-dependent induction of the level of mature miR172 in short time as well as long time experiments. A sucrose-dependent accumulation of miR172 was also measured in mature leaves of StSUT4-silenced plants where sucrose export is delayed and sucrose accumulates at the end of the light period.

scholarly journals Hydrological response to different time scales of climatological drought: an evaluation of the Standardized Precipitation Index in a mountainous Mediterranean basin

2005 ◽  
Vol 9 (5) ◽  
pp. 523-533 ◽  
Author(s):  
S. M. Vicente-Serrano ◽  
J. I. López-Moreno
Keyword(s):  
Time Scales ◽  
Hydrological Cycle ◽  
Standardized Precipitation Index ◽  
Precipitation Index ◽  
Drought Indices ◽  
Long Time ◽  
The Standardized Precipitation Index ◽  
Hydrological Droughts ◽  
Different Time Scales

Abstract. At present, the Standardized Precipitation Index (SPI) is the most widely used drought index to provide good estimations about the intensity, magnitude and spatial extent of droughts. The main advantage of the SPI in comparison with other indices is the fact that the SPI enables both determination of drought conditions at different time scales and monitoring of different drought types. It is widely accepted that SPI time scales affect different sub-systems in the hydrological cycle due to the fact that the response of the different water usable sources to precipitation shortages can be very different. The long time scales of SPI are related to hydrological droughts (river flows and reservoir storages). Nevertheless, few analyses empirically verify these statements or the usefulness of the SPI time scales to monitor drought. In this paper, the SPI at different time scales is compared with surface hydrological variables in a big closed basin located in the central Spanish Pyrenees. We provide evidence about the way in which the longer (>12 months) SPI time scales may not be useful for drought quantification in this area. In general, the surface flows respond to short SPI time scales whereas the reservoir storages respond to longer time scales (7–10 months). Nevertheless, important seasonal differences can be identified in the SPI-usable water sources relationships. This suggests that it is necessary to test the drought indices and time scales in relation to their usefulness for monitoring different drought types under different environmental conditions and water demand situations.

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