scholarly journals Regenerasi Jamuju (Dacrycarpus imbricatus (Blume.) de Laub.) di Cagar Alam Gebugan, Kabupaten Semarang Jawa Tengah

2018 ◽  
Vol 1 (2) ◽  
pp. 1
Author(s):  
Evananda Waskitaningtyas ◽  
Sri Utami ◽  
Erry Wiryani
Keyword(s):  
Environmental Factors ◽  
Soil Ph ◽  
Tree Species ◽  
Nature Reserve ◽  
Natural Habitat ◽  
Tree Level ◽  
Systematic Method ◽  
The People

Gebugan Nature Reserve is one of the protected forest that still has the natural habitat of Dacrycarpus imbricatus. D. imbricatus has the potential of producing wood that is widely used by the people while the exploitation of Jamuju causes this tree species difficult to find in their natural habitat. The aim of this research was to asses D. imbricatus regeneration. The method used for taking jamuju was systematic method. The number of plots used were 15 with 10 m x 10 m area for each plot. The number of individual jamuju at the tree level, pole level, sapling level and seedling level were counted at each plot. The result of this research showed the regeneration of jamuju in Gebugan Nature Reserve was poor, indicated by tree-level individual density (5 individuals/0.15 ha = 33.3 ind/ha), pole level (not found), sapling (4 individuals/0.15 ha = 26.6 ind/ha), and seedlings (21 individuals/0.15 ha = 140 ind/ha). The environmental factors of Jamuju were found to grow at the altitude of 1,050 m asl, temperature 26.7°C to 27°C, humidity 53% to 61%, soil pH 6.3 to 7.

scholarly journals Tree species diversity on ebony habitat with different degradation levels in Sulawesi

2021 ◽  
Vol 918 (1) ◽  
pp. 012052
Author(s):  
K F Fatlan ◽  
P Pamoengkas ◽  
M Majiidu ◽  
I Z Siregar
Keyword(s):  
Species Diversity ◽  
Tree Species ◽  
National Park ◽  
Forest Canopy ◽  
Nature Reserve ◽  
Diversity Index ◽  
Population Decline ◽  
Tree Level ◽  
Canopy Layer ◽  
Natural Habitats

Abstract Ebony (Diospyros celebica Bakh.) is endemic species to Sulawesi that is experiencing population decline. It is known that population size is an important element for the dynamics of natural forests through changes in vegetation structure and composition that need to be monitored. This study aims to analyze the species diversity in natural habitats of genetically diverse ebony, namely: i) Bantimurung National Park (BB), ii) Cani Sirenreng Nature Park (CS), iii) Farhumpenai Nature Reserve (FP), and iv) Pangi Binangga Nature Reserve (PB). Data collection was carried out based on a modified transect line and plot with 20 m x 100 m in size. The results showed that as many as 28 families were identified, consisting of 44 species at the tree level, 37 species at the pole level, 39 species at the sapling level, and 31 species at the seedling level, respectively. The composition of vegetation in Babul National Park consists of 32 species, Cani Sirenreng consists of 18 species, Farhumpenai consists of 19 species, and Pangi Binanngga consists of 19 species. The species composition was dominated by Diospyros celebica Bakh., Dracontomelon dao (Blanco) Merr. & Rolfe, Canangium odoratum, Ficus benjamina L., Pterospermum celebicum Miq., Kleinhovia hospita L. and Vitex cofassus Reinw. Ex Blume. The diversity index (H’-Index) of tree species in BB, CS, FP, and PB were 0.82, 1.13, 1.03, and 1.60, respectively. The Important Value Index (INP-Index) of ebony in BB, CS, FP and PB were 18.01%, 74.1%, 60.13% and 113.5%, respectively. The structure of the forest canopy layer in BB and FP consists of three layers of canopy, while CS and PB consist of two layers of canopy.

scholarly journals Spatial pattern of riparian plants along stream order among mountain rivers in China

2018 ◽  
Vol 9 (2) ◽  
pp. 322-330
Author(s):  
Rong Sun ◽  
Xiaojie Luo ◽  
Xiangyu Meng ◽  
Yan Wang
Keyword(s):  
Species Richness ◽  
Environmental Factors ◽  
Tree Species ◽  
Riparian Vegetation ◽  
Stream Order ◽  
River Continuum ◽  
Riparian Plants ◽  
Tree Species Richness ◽  
Riparian Species ◽  
Significant Difference

Abstract The streams in a watershed form a hierarchical network system. From the perspective of the river continuum, this classification system is the result of gradual increase in traffic. This study analyzed the riparian species richness, diversity and environmental factors along a six-order hierarchical mountain river in the Donghe watershed, China. A total of 34 sampling sites were sampled to study the spatial distribution of riparian plants among different stream orders. The results showed: Environmental factors among stream orders had significant differences. Among stream order, species richness showed remarkable differences. The species richness rose firstly and dropped afterwards except for tree species richness; tree species richness decreased while stream order increased. The same is true for shrub quadrat species richness. Shannon-Wiener diversity, Simpson dominance and Pielou uniformity showed significant difference among stream orders; Shannon-Wiener diversity rose firstly then dropped afterwards. For integrated environmental factors and community characteristics, we found the changes of stream orders had a significant impact on riparian habitats and riparian vegetation. Further analysis showed that riparian vegetation experienced different types and degrees of disturbance in different stream orders. This meant that a hierarchical management strategy should be applied to riparian vegetation management.

scholarly journals Soil greenhouse gas fluxes from different tree species on Taihang Mountain, North China

2014 ◽  
Vol 11 (6) ◽  
pp. 1649-1666 ◽  
Author(s):  
X. P. Liu ◽  
W. J. Zhang ◽  
C. S. Hu ◽  
X. G. Tang
Keyword(s):  
Soil Moisture ◽  
Organic Carbon ◽  
Soil Organic Carbon ◽  
Soil Temperature ◽  
Soil Ph ◽  
Tree Species ◽  
Soil Bulk Density ◽  
Total N ◽  
Gas Fluxes ◽  
Greenhouse Gas Fluxes

Abstract. The objectives of this study were to investigate seasonal variation of greenhouse gas fluxes from soils on sites dominated by plantation (Robinia pseudoacacia, Punica granatum, and Ziziphus jujube) and natural regenerated forests (Vitex negundo var. heterophylla, Leptodermis oblonga, and Bothriochloa ischcemum), and to identify how tree species, litter exclusion, and soil properties (soil temperature, soil moisture, soil organic carbon, total N, soil bulk density, and soil pH) explained the temporal and spatial variation in soil greenhouse gas fluxes. Fluxes of greenhouse gases were measured using static chamber and gas chromatography techniques. Six static chambers were randomly installed in each tree species. Three chambers were randomly designated to measure the impacts of surface litter exclusion, and the remaining three were used as a control. Field measurements were conducted biweekly from May 2010 to April 2012. Soil CO2 emissions from all tree species were significantly affected by soil temperature, soil moisture, and their interaction. Driven by the seasonality of temperature and precipitation, soil CO2 emissions demonstrated a clear seasonal pattern, with fluxes significantly higher during the rainy season than during the dry season. Soil CH4 and N2O fluxes were not significantly correlated with soil temperature, soil moisture, or their interaction, and no significant seasonal differences were detected. Soil organic carbon and total N were significantly positively correlated with CO2 and N2O fluxes. Soil bulk density was significantly negatively correlated with CO2 and N2O fluxes. Soil pH was not correlated with CO2 and N2O emissions. Soil CH4 fluxes did not display pronounced dependency on soil organic carbon, total N, soil bulk density, and soil pH. Removal of surface litter significantly decreased in CO2 emissions and CH4 uptakes. Soils in six tree species acted as sinks for atmospheric CH4. With the exception of Ziziphus jujube, soils in all tree species acted as sinks for atmospheric N2O. Tree species had a significant effect on CO2 and N2O releases but not on CH4 uptake. The lower net global warming potential in natural regenerated vegetation suggested that natural regenerated vegetation were more desirable plant species in reducing global warming.

scholarly journals KEANEKARAGAMAN JENIS ANGGREK ALAM (Orchidaceae) BERDASARKAN KETINGGIAN TEMPAT DI GUNUNG POTENG CAGAR ALAM RAYA PASI KOTA SINGKAWANG PROVINSI KALIMANTAN BARAT

2020 ◽  
Vol 8 (3) ◽  
Author(s):  
Novita Putri Sesar ◽  
Iskandar A M ◽  
Togar Fernando Manurung
Keyword(s):  
Species Diversity ◽  
Environmental Factors ◽  
Nature Reserve ◽  
Diversity Index ◽  
Economic Value ◽  
Survey Method ◽  
Species Diversity Index ◽  
Orchid Species ◽  
West Kalimantan ◽  
Medium Range

Natural orchids are one of the flora in Mount Poteng which is included of Raya Pasi Nature Reserve located at Singkawang City, West Kalimantan Province. Orchids have economic value for source of income and be beneficial to ecology that needs to be protected. The altitudes and environmental factors strongly affected the presence of orchid species.The research aims to record the diversity of natural orchids species based on the altitudes place in Mount Poteng. The research was conducted on February 28 until March 28, 2020. This research uses survey method. The research sample was taken using double plots method and to determine sample plots locations is conducted by purposive. The total number of the sample plots is 16 plots and each plot measure 20 by 50 meters. Based on the result of research found 19 species of natural orchids that consist of 348 individuals. The results analysis of the diversity index of orchid species in whole of altitudes at Mount Poteng is 1,338 that is included medium range. The highest species diversity index of 1,300 occurred at altitude of 400-500 m asl and the lowest species diversity index at altitude of 700-725 m asl that is 0,594. Orchid species which found in whole of altitudes is Dendrobium crumenatum. Furthermor, there were found the orchid species on certain heights are Cleisostoma scortechinii, Cordiglottis filiformis, Ludisia discolor, and Phalaenopsis pantherina at altitude of 400-500 m asl and species of Bromheadia finlaysoniana and Pomatocalpa latifolia found at altitude of 700-725 m asl.Keywords: altitudes, mount poteng, orchids, species diversity

scholarly journals FAKTOR PENYEBAB KETERLAMBATAN PEKERJAAN KONSTRUKSI MENURUT PRESEPSI KONTRAKTOR

2016 ◽  
Vol 1 (1) ◽  
pp. 20
Author(s):  
Elvira Handayani
Keyword(s):  
Local Government ◽  
Environmental Factors ◽  
Construction Work ◽  
Financial Factor ◽  
Control Time ◽  
The People ◽  
Common Problems ◽  
And Control ◽  
The City

Jambi city is one of the cities that began to develop on the island of Sumatra in the field of infrastructure and the economy, so development is one activity that is enhanced by the local government in the framework of the welfare and prosperity of the people of Jambi. In the process of development is very common problems causing delays in work, many factors causing delays become very common problem faced by the parties involved, especially the Contractor which act as implementers.From the research the factors causing delays in construction work in the city of Jambi as perceived by the contractor, a number of conclusions, among others:Factors Materials and Materials obtain a total score of 7.18,Environmental Factors obtain a total score of 5.96,Financial Factor obtain a total score of 5.99,Factors Changes obtain a total score of 6.95,The Labor get highest total score is 7.29,Factors and Control Time to get a total score of 5.93,Factors Hardware obtain a total score of 7.15

scholarly journals Factors Influencing the Natural Forest Regeneration at Khadimnagar National Park, Bangladesh

2021 ◽  
Vol 11 (1) ◽  
pp. 73-83
Author(s):  
MAHEDI HASAN LIMON ◽  
SAIDA HOSSAIN ARA ◽  
MOHAMMAD GOLAM KIBRIA
Keyword(s):  
Species Richness ◽  
Bulk Density ◽  
Total Variation ◽  
Soil Ph ◽  
Tree Species ◽  
Natural Regeneration ◽  
National Park ◽  
Canopy Openness ◽  
Site Factors ◽  
Tree Species Richness

Natural regeneration is an indicator of a healthy forest, hence, understanding the influence of site factors on natural regeneration is a significant concern for ecologists. This work aimed to assess the impact of site factors on natural tree regeneration at Khadimnagar National Park (KNP). Biotic factors (tree density, tree species richness, and basal area), physical factors (elevation, canopy openness), and soil properties (bulk density, moisture content, soil pH, organic matter, sand, silt, and clay) data were investigated from 71 sample plots to examine their effects on natural regeneration density and richness in KNP. Stepwise multiple linear regression analysis was done to predict both regeneration density and regeneration richness. The results showed that soil pH (p<0.001), canopy openness (p<0.001), tree species richness (p<0.01), and bulk density (p<0.01) had a significant effect on regeneration density, explaining 42% of the total variation. Regeneration richness was driven by four factors: tree species richness (p<0.01), soil pH (p<0.001), elevation (p<0.01), and canopy openness (p<0.01) with a model that explained 60% of the total variation. This study observed that soil pH, tree species richness, and canopy openness are the main controlling factors that influenced both the density and richness of regenerating species in KNP. Therefore, these findings have implications for natural resource management, especially in selecting suitable silvicultural systems in a tropical forest under protected area management where enhanced tree cover and conservation of biodiversity are needed.

scholarly journals KAJIAN KRIMINOLOGI PEREDARAN NARKOTIKA (SEBUAH STUDI DI KABUPATEN ACEH TIMUR)

2019 ◽  
Vol 5 (1) ◽  
Author(s):  
Muammar
Keyword(s):  
Environmental Factors ◽  
Development Process ◽  
Negative Impact ◽  
National Development ◽  
Deterrent Effect ◽  
Youth Organizations ◽  
The People ◽  
The Republic ◽  
Work Family ◽  
The Impact

The impact of globalization has penetrated throughout the civilization of the nations of the world, running so fast. Especially very influential on changes in various lines of life. Related to this is the issue of increasing narcotics abuse and narcotics illicit trafficking which has created conditions that have hindered the development process and weakened civilization. Eradication of narcotics distribution is a national problem, because it has a negative impact that can damage and threaten the lives of the people, nation and state and can hamper the national development process. The rise of narcotics abuse does not only occur in big cities, but has reached small cities in all ten regions of the Republic of Indonesia, including East Aceh Regency. The increasingly diverse lifestyle of the people due to the influence of globalization also contributes to the increasing circulation of narcotics in East Aceh District. This certainly must receive serious attention, because if we look at what is happening in East Aceh District and several other regions in Indonesia, the crime of narcotics distribution from time to time always increases which in the end is increasingly unsettling the community, so before these things increase In East Aceh District, an effective solution must be found to eradicate it. Factors that cause a person to commit a narcotics crime in East Aceh Regency are due to economic factors where a person needs money to live and the difficulty of getting work, family environmental factors, social environmental factors and availability / lack of supervision factors. Efforts in tackling narcotics circulation in East Aceh district involve many parties, including: firstly, pre-emptive efforts by providing counseling in the community and schools about narcotics carried out by the police in tackling narcotics crime in East Aceh District. Second, preventive measures (prevention) by conducting raids and patrols routinely, providing oversight of the association and positive activities carried out by the police, prosecutors, religious leaders, community leaders and youth organizations. The third repressive effort (action) which aims to provide a deterrent effect on the perpetrators of drug trafficking crimes involving all law enforcement officials ranging from the Police, Attorney and District Courts and Detention Houses.Keywords: Crimonology, Narcotics Circulation. 

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