scholarly journals Effect of Vegetation Cover on Pre-Monsoonal Rainfall Trend over Ranchi Region, Jharkhand, India

2020 ◽  
Vol 9 (5) ◽  
pp. 1224-1228
Keyword(s):  
Vegetation Cover ◽  
Extreme Event ◽  
Rainfall Variability ◽  
Rainfall Pattern ◽  
Western Region ◽  
Eastern Region ◽  
Positive Trend ◽  
Green Cover ◽  
Western Side ◽  
Monsoonal Season

In the present study, trend of changing rainfall pattern and its correlation with vegetation cover during premonsoonal season were determined for Ranchi district of Jharkhand for the last 20 years. In the year 1998 the western side of the district received a good amount of rainfall but the scenario after that was observed quite alarming. In the next 20 years the western region received very low rainfall except in the year of 2005 and 2014. While year 2005 received a good rainfall in south-western region of the district. Eastern region having a good amount of green cover received plenty of rainfall consistently in last two decade. The central part is the most urbanized zone of the study area having least green cover. This zone has never received good rainfall in last two decade. On the contrary despite of having good vegetation over the north-western side; the region never received good rainfall. The NonParametric trend analysis for last 20 years shows an overall increase in rainfall with 0.141625 mm . While the analysis for last 117 years showed a significant positive trend in pre-monsoonal month of February, March, and April while a negative trend was observed in May. The maximum decrease in rainfall was found in the month of February (-0.1804803 mm ) and minimum (-0.0007663818 mm ) during the month of April. The trend of rainfall during month of May was found increasing (0.1296284 mm ).While the overall trend of rainfall during pre-monsoonal season (MarchMay) was found increasing (0.02156622 mm ). Rainfall variability pattern showed the maximum value of CV as 105.7%, whereas pre-monsoonal rainfall showed the minimum value of CV as 60.52%. High variation of CV indicated that the study are is vulnerable to droughts and floods. Disturbance in uniformity of distribution in rainfall pattern and extreme event cases over the district during the pre-monsoonal season in last two decade was observed.

scholarly journals Analysis of the Dynamic Change of Vegetation Cover in the Mechanical Forest Field of Sehan Dam Based on RS

2021 ◽  
Vol 9 (4) ◽  
Author(s):  
Yun Shang ◽  
Yanbin Qin ◽  
Pinyang Hu ◽  
Han Zheng ◽  
Zhi Zeng
Keyword(s):  
Vegetation Cover ◽  
Dynamic Change ◽  
Central China ◽  
Green Water ◽  
Western Region ◽  
Eastern Region ◽  
Human Beings ◽  
Dynamic Changes ◽  
The Western Region ◽  
Forest Farm

In order to study the dynamic changes of vegetation cover in saihanba mechanical forest farm in the past 30 years, this paper used the Landsat remote sensing images of the area in 1989, 2001 and 2016 provided by the geospatial data cloud platform, and extracted the vegetation coverage information of saihanba mechanical forest farm with normalized vegetation index and pixel dichotomy, and analyzed the dynamic changes of vegetation cover in the three periods. Results show that fr om 1989 to 2001, mechanical sihanba forest vegetation cover age as a whole is in a state of slow wave growth, the western region is relatively stable, relatively obvious growth in central China, the eastern region has no obvious change. From 2001 to 2016, the FVC of this region has been significantly increased, especially in the western region where the FVC has been transformed from very low to very high FVC.The comprehensive results show that the vegetation cover of saihanba mechanical forest farm has undergone earth-shaking changes through artificial afforestation, creating a green miracle from vast wasteland to green water and green mountains, and bringing great ecological and social benefits to human beings.

scholarly journals The Role of Mesoscale Convective Complexes in Southern Africa Summer Rainfall

2013 ◽  
Vol 26 (5) ◽  
pp. 1654-1668 ◽  
Author(s):  
R. C. Blamey ◽  
C. J. C. Reason
Keyword(s):  
South Africa ◽  
Southern Africa ◽  
Rainfall Variability ◽  
Warm Season ◽  
Tropical Rainfall Measuring Mission ◽  
Summer Rainfall ◽  
Spatial And Temporal Variability ◽  
Eastern Region ◽  
Southwest Indian Ocean ◽  
Mesoscale Convective

Abstract A combination of numerous factors, including geographic position, regional orography, and local sea surface temperatures, means that subtropical southern Africa experiences considerable spatial and temporal variability in rainfall and is prone to both frequent flooding and drought events. One system that may contribute to rainfall variability in the region is the mesoscale convective complex (MCC). In this study, Tropical Rainfall Measuring Mission (TRMM) Multisatellite Precipitation Analysis (TMPA) data is used to document the precipitation produced by MCCs over southern Africa for the 1998–2006 period. Most of the rainfall associated with MCCs is found to occur over central Mozambique, extending southward to eastern South Africa. High precipitation totals associated with these systems also occur over the neighboring southwest Indian Ocean, particularly off the northeast coast of South Africa. MCCs are found to contribute up to 20% of the total summer rainfall (November–March) in parts of the eastern region of southern Africa. If the month of March is excluded from the analysis, then the contribution increases up to 24%. In general, the MCC summer rainfall contribution for most of the eastern region is approximately between 8% and 16%. Over the western interior and Botswana and Namibia, the MCC contribution is much less (<6%). It is also evident that there is considerable interannual variability associated with the contribution that these systems make to the total warm season rainfall.

scholarly journals Biodiversity of Vegetation around the Mingechevir Reservoir

2021 ◽  
Author(s):  
Novruzov V Vagif ◽  
İsmailova Zilkhumar
Keyword(s):  
High Pressure ◽  
Deep Water ◽  
Vegetation Cover ◽  
Land Reclamation ◽  
Earth Dam ◽  
Anthropogenic Factors ◽  
Green Cover ◽  
Original Vegetation ◽  
Artificial Reservoirs

Mingechevir reservoir is one of the deep-water artificial reservoirs in the territory of Azerbaijani was created on the Kura River in the 50s. Before the construction of the Mingechevir reservoir, 681 species of plants belonging to 74 families and 325 genera were found here. As a result of our research in the valley in 2019-2021, only 154 species were found, belonging to 24 families and 36 genera. As a result of changes during the last 70 years of the hydrographic regime, the influence of edaphic, physical, anthropogenic factors, the original vegetation cover of the Mingechevir Valley has completely changed, and urbanization, land reclamation and other works have further accelerated these changes. If the successions that have begun are not prevented, there may be a risk of destruction of the high-pressure earth dam built in Europe using the leaching method. With the implementation of the proposed phytomeliorative measures, the bare slopes of the reservoir dam can be turned into a “green cover”.

scholarly journals Regional and Local Moisture Gradients Drive the Resistance to and Recovery from Drought of Picea crassifolia Kom. in the Qilian Mountains, Northwest China

Forests ◽  
2019 ◽  
Vol 10 (9) ◽  
pp. 817 ◽  
Author(s):  
Lingnan Zhang ◽  
Hui Li ◽  
Yilin Ran ◽  
Keyi Wang ◽  
Xiaomin Zeng ◽  
...  
Keyword(s):  
Radial Growth ◽  
Northwest China ◽  
Qilian Mountains ◽  
Mean Annual Temperature ◽  
Western Region ◽  
Drought Event ◽  
Eastern Region ◽  
Picea Crassifolia ◽  
The Western Region ◽  
The Qilian Mountains

Increasing evidence suggests that extreme droughts cause more frequent tree growth reduction. To understand the consequences of these droughts better, this study used tree-ring cores from nine sites to investigate how moisture and altitudinal gradients affect the radial growth of Picea crassifolia Kom., a common species in the Qilian Mountains in northwest China. The total annual precipitation and mean annual temperature in the eastern region were higher than those in the western region of the Qilian Mountains. The trees in the eastern region showed stronger resistance to drought than those in the west, as they had a smaller difference in radial growth between drought disturbance and pre-drought disturbance. At the same time, the trees in the east showed weaker ability to recover from drought, as they had a subtle difference in radial growth between post-drought disturbance and drought disturbance. Furthermore, the trees in the east also showed weaker relative resilience to drought, as they had a small difference in radial growth between post-drought and drought disturbance weighted by growth in pre-drought disturbance. For trees below 3000 m a.s.l., trees with high resistance capacity usually had low recovery capacity and low relative resilience capacity. Trees at higher altitudes also showed stronger resistance to drought and weaker ability to recover from drought after a drought event than those at lower altitudes in the middle of the Qilian Mountains. Trees at lower altitudes in the middle of the Qilian Mountains had more difficulties recovering from more severe and longer drought events. In the context of global warming, trees in the western region and at lower altitudes should be given special attention and protection in forest management to enhance their resistance to extreme droughts.

scholarly journals Understanding the factors influencing rill erosion on roadcuts in the south eastern region of South Africa

Solid Earth ◽  
2015 ◽  
Vol 6 (2) ◽  
pp. 633-641 ◽  
Author(s):  
K. E. Seutloali ◽  
H. R. Beckedahl
Keyword(s):  
South Africa ◽  
Vegetation Cover ◽  
Site Effects ◽  
Eastern Region ◽  
Rill Erosion ◽  
Economic Costs ◽  
Slope Gradient ◽  
Factors Influencing ◽  
Relationship Of ◽  
The Relationship

Abstract. Erosion on roadcuts is a concern due to the potential of causing environmental degradation, which has significant economic costs. It is therefore critical to understand the relationship between roadcut characteristics and soil erosion for designing roadcuts that are less vulnerable to erosion and to help road rehabilitation works. This study investigated the characteristics (i.e. gradient, length, percentage of vegetation cover and soil texture) of degraded (i.e. with rills) and non-degraded roadcuts (i.e. without rills) and explored the relationship of the roadcut characteristics with the dimensions (widths and depths) of the rills. Degraded roadcuts were steep (52.21°), long (10.70 m) and had a low percentage of vegetation cover (24.12) when compared to non-degraded roadcuts which had a gradient of 28.24°, length of 6.38 m and 91.7% of vegetation cover. Moreover, the gradient and percentage of vegetation cover of the roadcut significantly determine the rill dimensions. The widths and depths of the rills increase with the increase in slope gradient and decrease with an increase in percentage of vegetation cover. Moreover, the widths and depths of the rills decreased downslope of the roadcuts. Based on these results, re-vegetation of roadcuts as well as construction of gentle gradients could minimise rill erosion and hence the negative on-site and off-site effects.

Wood anatomy of Cupressus and its relation to geographical distribution

IAWA Journal ◽  
2016 ◽  
Vol 37 (1) ◽  
pp. 48-68 ◽  
Author(s):  
Elena Román-Jordán ◽  
Luis G. Esteban ◽  
Paloma de Palacios ◽  
Francisco G. Fernández
Keyword(s):  
Wood Anatomy ◽  
Central American ◽  
Western Region ◽  
Eastern Region ◽  
Axial Parenchyma ◽  
Chamaecyparis Nootkatensis ◽  
The North ◽  
Phylogenetic Studies ◽  
Molecular Phylogenetic ◽  
Ray Parenchyma Cells

The wood anatomy of 14 species of Cupressus was studied to determine whether there is a pattern of wood anatomical diversity between the species from the North and Central American (western) region and the Eurasian (eastern) region. Xanthocyparis vietnamensis and Chamaecyparis nootkatensis (syn. Xanthocyparis nootkatensis) were also studied to compare their wood anatomy, given their recent inclusion by some authors in Cupressus. The arrangement of the axial parenchyma, morphology of the transverse end walls of the axial parenchyma, presence of ray tracheids, typology of the end walls of the ray parenchyma cells and ray height support to some extent the division of Cupressus into two large groups: the American group (western region) and the Eurasian group (eastern region), as proposed in molecular phylogenetic studies. The wood anatomy of Chamaecyparis nootkatensis shares the presence of ray tracheids and the same ray typology with American Cupressus, and has the same ray height as Eurasian Cupressus. In contrast, Xanthocyparis vietnamensis shares the absence of ray tracheids and the same ray typology with Eurasian Cupressus, and has the same ray height as American Cupressus.

The Food and Growth of the Maskinonge (Esox masquinongy Mitchill) in Canadian Waters

1952 ◽  
Vol 8c (5) ◽  
pp. 347-368 ◽  
Author(s):  
Alan S. Hourston
Keyword(s):  
Yellow Perch ◽  
Fork Length ◽  
The Other ◽  
Western Region ◽  
Eastern Region ◽  
Weight Relationship ◽  
Straight Line ◽  
Central Regions ◽  
The Western Region ◽  
St Lawrence River

Maskinonge from three regions were studied: the Lake of the Woods district in Ontario (called Western); the Kawartha Lakes and Georgian Bay district in Ontario (Central) and the St. Lawrence River district in Quebec (Eastern). Examination of 202 stomachs, 81 containing food, showed the maskinonge to be a general carnivore, preying mainly on fish over 150 mm. in length. The families Percidae, Catostomidae, Ameiuridae, Centrarchidae, Hiodontidae, Esocidae and Cyprinidae were represented, along with at least one Cambarus. The yellow perch, Perca flavescens, was the species eaten most frequently in all three regions. A common white sucker (Catostomus commersonnii) was found in a stomach of the hybrid E. masquinongy × E. lucius. Examination of the teeth of each specimen showed that they were being continuously replaced throughout the summer season.Rate of growth varied with sex and locality. Females had a significantly faster rate of growth, both in length and in weight, than did males. Maskinonge from the Western Region were shorter and weighed less than fish of the same age from the other two regions. Maskinonge of the Eastern and Central Regions reached the legal size of 30 inches fork length during their fifth summer, but in the Western Region they did not attain this size until their seventh summer. The length-weight relationship appears to be the same in the Eastern and Central Regions, whereas maskinonge from the Western Region tended to be heavier than those of comparable lengths from the other two regions. In all regions the length-weight relationship was a straight line when plotted logarithmically, its slope being estimated as 3.26 in the Eastern Region. Sexual maturity occurs first between the ages of three and six years, or about 575 to 800 mm. fork length. Specimens of a E. masquinongy × E. lucius hybrid appeared to be infertile. They did not differ from the maskinonge specimens in their length-weight relationships but made faster growth than did the maskinonge from the same region.

High Toxoplasma Seroprevalence Associated with Meat Eating Habits of Locals in Nepal

1999 ◽  
Vol 11 (2) ◽  
pp. 89-93 ◽  
Author(s):  
Shiba Kumar Rai ◽  
Takeo Matsumura ◽  
Kazuo Ono ◽  
Ayako Abe ◽  
Kazuko Hirai ◽  
...  
Keyword(s):  
Eating Habits ◽  
Western Region ◽  
Eastern Region ◽  
Meat Eating ◽  
The People ◽  
Significant Difference ◽  
The Western Region ◽  
Toxoplasma Gondii Infection ◽  
Apparently Healthy

A serosurvey of Toxoplasma gondii infection in apparently healthy subjects (n=404) living in Achham (n=215) and Dang (n=189) districts in western Nepal was carried out. An interview with 249 participants, each representing a household, was also conducted. This interview pertained to their meat eating habits and the keeping of cats in their houses. Toxoplasma antibodies were detected by using the microlatex agglutination test. The overall seroprevalence was 65.3% with no significant difference in the two districts (Achham: 66.9% and Dang: 63.5%) included ( p=0.546). Females and the Indo-Aryan ethnic-group showed marginally higher prevalence compared with their male ( p=0.545) and Tibeto-Burman ( p=0.075) counterparts. The majority of the infections was found to have occurred during childhood. The frequency of meat eating in western and eastern regions differed greatly ( p=0.000) with the people in the eastern region being frequent meat eaters than those in the western region. About one-third of the subjects, all Indo-Aryans, in the western region had the raw meat eating habit but none in the eastern region. Approximately 7.0% of households in both western and eastern regions kept cats. The present findings demonstrated a typical role of meat eating habits of people in the high Toxoplasma seroprevalence in Nepal.

scholarly journals Origin, Genetic Diversity, and Population Structure of Rabbits (Oryctolagus cuniculus) in Kenya

2019 ◽  
Vol 2019 ◽  
pp. 1-6 ◽  
Author(s):  
Sharon Auma Owuor ◽  
Edward George Mamati ◽  
Remmy Wekesa Kasili
Keyword(s):  
Genetic Diversity ◽  
Population Structure ◽  
Western Region ◽  
Eastern Region ◽  
Low Genetic Diversity ◽  
Loop Region ◽  
Agriculture Industry ◽  
D Loop ◽  
Breeding Programmes ◽  
Geographic Regions

To evaluate the origin, genetic diversity, and population structure of domesticated rabbits in Kenya, a 263-base pair region of mtDNA D-loop region of 111 rabbits sampled from Kakamega, Vihiga, and Bungoma counties in the western region, Laikipia and Nyandarua counties in the central region, and Kitui, Machakos, and Makueni in the eastern region of the country were analyzed. The average haplotype (0.40702) and nucleotide (0.01494) diversities observed were low, indicating low genetic diversity of domesticated rabbits in Kenya. This study resolved 5 unique haplotypes in the mtDNA D-loop region. A population genetic structure distinguishing Europe grouping and domesticated rabbits in Kenya was obtained on incorporating 32 known haplotypes. Domesticated rabbits in Kenya clustered together with rabbits from other geographic regions, suggesting common origin. The results suggested that the Kenyan domesticated rabbits may have originated from Europe. Integration of exotic breeds into breeding programmes could have contributed to the low genetic diversity. These results provide useful information for breeding and conservation decisions by the relevant stakeholders in the agriculture industry in Kenya.

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