scholarly journals Spatial Heterogeneity of Plant Diversity within and between Neighborhoods and Its Implications for a Plant Diversity Survey in Urban Areas

Forests ◽  
2021 ◽  
Vol 12 (4) ◽  
pp. 416
Author(s):  
Yuebo Su ◽  
Cheng Gong ◽  
Bowen Cui ◽  
Peipei Guo ◽  
Zhiyun Ouyang ◽  
...  

The spatial heterogeneity of plant diversity at the neighborhood scale has less been understood, although it is very important for the planning and management of neighborhood landscape. In this case study of Beijing, we conducted intensive investigations of the plant diversity in different neighborhoods along a rural–urban gradient. The results showed that the mean numbers of plant species per neighborhood were 30.5 for trees, 18.8 for shrubs, and 31.9 for herbs, respectively. There were significant logarithmic relationships between the numbers of species and patch area, indicating that larger patches within neighborhoods could harbor more plant species. Hierarchical linear modeling showed that the variations in plant diversity within neighborhoods were higher than those between neighborhoods. The number of species increased logistically with both the number of patches within neighborhoods and the number of neighborhoods, suggesting that it is important to sample a sufficient number of patches within neighborhoods, as well as a sufficient number of neighborhoods in order to sample 90% of the plant species during the investigation of plant diversity in urban neighborhoods. So the hierarchical design of sampling should be recommended for investigating plant diversity in urban areas.

2021 ◽  
Vol 67 (3-4) ◽  
pp. 149-155
Author(s):  
Har'el Agra ◽  
Hadar Shalom ◽  
Omar Bawab ◽  
Gyongyver J. Kadas ◽  
Leon Blaustein

Abstract Green roofs are expected to contribute to higher biodiversity in urban surroundings. Typically, green roofs have been designed with low plant diversity. However, plant diversity can be enhanced by controlling resource availability and creating distinct niches. Here we hypothesize that by using different drainage heights during the short plant-growing season in a semi-arid green roof system we can create distinct niches and plant communities. Our experiment took place at the University of Haifa, north Israel. We tested three different heights of drainage outlet: 10 cm under the surface of the substrate (Low), 1 cm under the surface of the substrate (Medium) and 3 cm above the surface of the substrate (High) on plant species-composition in green-roof gardens. Grasses cover was higher in High and Medium drainages while forbs cover was higher in Low drainage. Species richness was the highest in Low drainage while diversity indices showed the opposite trend. We conclude that by changing the height of the drainage we can create different niches and change species composition in a short time period of one growing season. This way we can create more diverse green roof communities and enhance biodiversity in urban areas, particularly in semi-arid regions.


Author(s):  
Julius Maiyo ◽  
Manasi Echaune

ABSTRACT This study sought to analyze teacher effects on high school academic achievement scores in Busia County, Kenya. The study was based on the education production function theory. A descriptive survey research design was employed. A sample of 236 teachers and 755 students was used. Self administered questionnaires were used to collect data and test re-test was used to ascertain reliability of the instrument. Descriptive statistics namely; percentages, frequencies, mean, and standard deviations were used to carry out preliminary data analysis. Inferential statistics specifically correlation and regression coefficients were then used to test hypotheses. Hierarchical linear modeling was used to model effect of selected teacher variables on school academic achievement scores. Findings of the study were presented in tables and figures. Findings of the study suggested that the number of teachers, teacher commitment and teachers covering missed lessons had statistically significant effects on school academic achievement scores. Key words: Teacher Variables, Academic Achievement Scores, Kenya


2016 ◽  
Vol 23 (2) ◽  
pp. 37-43 ◽  
Author(s):  
B. K. Paudyal

The study was conducted in the Pragatisil Community Forest, Kaski District, Nepal in 2012 to assess the regeneration status of Sal (Shorea robusta) seedlings, its growth and plant diversity. A plot size of 25 m × 20 m was employed for trees, 10 m ×10 m for poles and 5 m × 5 m for regeneration. The growth parameters measured were dbh and height. A factorial arrangement of treatments was employed; the treatments being slope and aspect. The results showed that there was significant (p<0.05) effect of slope on dbh and basal area whereas there was no effect of aspect on growth parameters measured in the Pragatisil Community Forest. The regeneration of Sal was satisfactory (6,126 seedlings/ha), and there were 32 plant species in this forest. As there was higher basal area per ha in the Pragatisil Community Forest, it is recommended to have thinning of 40% of basal area for enhancing growth of remaining stems.Banko Janakari, Vol. 23, No. 2, 2013


Forests ◽  
2020 ◽  
Vol 11 (2) ◽  
pp. 171 ◽  
Author(s):  
Meng Wang ◽  
Junxiang Li ◽  
Shengjian Kuang ◽  
Yujuan He ◽  
Guojian Chen ◽  
...  

Urbanization is one of the major causes for plant diversity loss at the local and regional scale. However, how plant species distribute along the urban–rural gradient and what the relationship between urbanization degree and plant diversity is, is not very clear. In this paper, 134 sample sites along two 18 km width transects that run across the urban center of Shanghai were investigated. We quantified the spatial patterns of plant diversity along the urban–rural gradient and measured the relationship between plant diversity and urbanization degree, which was calculated using a land use land cover map derived from high spatial resolution aerial photos. We recorded 526 vascular plant species in 134 plots, 57.8% of which are exotic plant species. Six spatial distribution patterns of species richness were identified for different plant taxa along the rural to urban gradient. The native plant species richness showed no significant relationship to urbanization degree. The richness of the all plants, woody plants and perennial herbs presented significant positive relationship with urbanization degree, while the richness of annual herbs, Shannon-Wiener diversity and Heip evenness all exhibited a negative relationship to urbanization degree. Urbanization could significantly influence plant diversity in Shanghai. Our findings can provide insights to understand the mechanism of urbanization effects on plant diversity, as well as plant diversity conservation in urban areas.


2020 ◽  
Vol 31 (3) ◽  
pp. 237-263
Author(s):  
Ninik Suhartini ◽  
Paul Jones

Notions of order and rules play a key role in organizing the arrangement of built and unbuilt spaces. Order is achieved at various scales, such as the global, the metropolitan, the district and the neighborhood scale, by using formal and informal rules, regulations, plans and policies. Rules are the conduit by which the spatial order of urban areas is implemented and achieved. Combined with order, they are key tenets of modern planning, influencing the layout, patterns, and processes that shape urban areas. Set within the context of a wider understanding of order, rules, adaptation and how the city self-organizes and transforms, this paper examines a typology of order and rules determining the spatial order in informal settlements. The paper views the city as a dynamic system of formal rules, regulations, plans, codes and emergent informal rules, protocols and conventions that modulate and facilitate adaptation, incrementalism and step-by-step housing change in informal settlements. Using a case study of kampung Lebak Sililwangi in Bandung, Indonesia, the research deconstructed the local spatial order that exists and identifies two main rule types, namely defined and understood rules. These rules represent a set of socially acceptable activities, tasks and principles that residents use, modify and adapt to produce and refresh existing built and unbuilt spaces to meet varying needs. Rules may change from understood to defined rules and vice versa, and in this setting, systems of self-organization and arrangement of order continue to evolve and adapt. The paper is aimed at providing a deeper understanding of the nature of order and types of rules, including their relationship to the public interest and the production of negative externalities. Abstrak. Pengertian tatanan dan aturan memainkan peran kunci dalam mengatur penataan ruang terbangun dan tak terbangun. Tatanan dicapai di berbagai skala seperti global, metropolitan, distrik dan lingkungan dengan menggunakan aturan, regulasi, rencana dan kebijakan formal dan informal. Aturan adalah alat dan saluran untuk mencapai dan membangun suatu tatanan ruang wilayah perkotaan. Kombinasi antara tatanan dan aturan adalah prinsip utama dari perencanaan modern yang mempengaruhi tata letak, pola, dan proses yang membentuk daerah perkotaan. Dalam konteks pemahaman tatanan yang lebih luas terkait dengan aturan, adaptasi dan bagaimana kota mengatur dan mentransformasikan diri, makalah ini membahas tipologi tatanan dan aturan yang menentukan tatanan spasial di permukiman informal. Makalah ini memandang kota sebagai sistem dinamis dari aturan formal, regulasi, rencana, kode dan aturan informal yang muncul, protokol dan konvensi yang memodulasi dan memfasilitasi adaptasi, inkrementalisme dan perubahan perumahan bertahap di permukiman informal. Dengan menggunakan studi kasus kampung Lebak Sililwangi di Bandung, Indonesia, penelitian ini mendekonstruksi tatanan ruang lokal yang ada dan mengidentifikasi dua jenis aturan utama, yaitu aturan yang didefinisikan dan dipahami. Aturan-aturan ini mewakili serangkaian aktivitas, tugas, dan prinsip yang dapat diterima secara sosial yang digunakan, dimodifikasi, dan diadaptasi oleh penghuni untuk menghasilkan dan menghidupkan ruang yang sudah dibangun dan yang belum dibangun untuk memenuhi berbagai kebutuhan. Aturan dapat berubah dari aturan yang dipahami menjadi aturan yang didefinisikan dan sebaliknya. Dalam konteks ini, sistem pengaturan mandiri dan pengaturan tatanan terus berkembang dan beradaptasi. Makalah ini bertujuan untuk memberikan pemahaman yang lebih dalam tentang sifat tatanan dan jenis aturan termasuk hubungannya dengan kepentingan publik dan produksi eksternalitas negatif.Kata kunci. pengaturan mandiri, tatanan, aturan, bentuk, struktur, permukiman informal.


2018 ◽  
Vol 7 (2.1) ◽  
pp. 75
Author(s):  
B Akhila ◽  
K Sai Krishna ◽  
M Sri Nikhil ◽  
Malathi Narra

In urban areas, traffic congestion is a major problem. Heavy traffic flow on National Highways with high speed, when mixed up with local traffic at crossings, traffic congestion is likely to occur. This causes many negative effects like pollution, delay, accidents and improper traffic management at crossings. At Benz circle one of the rotary intersections in Vijayawada, the above problem frequently occurs. To reduce the ill effects, some solution is needed to be provided. So, as a solution- Construction of flyover at this intersection is proposed and accepted as the best alternative or solution for the problem. For this classified volume count survey and analysis is carried out and the capacity of the existing lane is checked. But in the mean-time of construction there might be increase in the traffic congestion and speed delays due to the diversion of routes. 


Land ◽  
2021 ◽  
Vol 10 (7) ◽  
pp. 684
Author(s):  
Shao-Chi Fang ◽  
Wen-Chih Yeh ◽  
Chun-Chang Lee ◽  
Zheng Yu

This study examined 19 urban land consolidation areas in Kaohsiung City, Taiwan, as well as cost-equivalent lands auctioned off from 2013 to 2019. Hierarchical linear modeling was used for analysis, in which the Level 1b variables pertained to cost-equivalent land and the Level 2 variables pertained to land consolidation areas. According to the empirical results, in terms of the estimation results, there were significant differences between the mean price of each urban land consolidation area. Therefore, HLM is suitable for the subsequent analysis. A total of 76.7% of the differences in the mean land consolidation area price were contributed by the differences between the land consolidation areas. Therefore, it is important to consider the differences generated by the particular features of each area.


2019 ◽  
Vol 18 (2) ◽  
pp. 106-111
Author(s):  
Fong-Yi Lai ◽  
Szu-Chi Lu ◽  
Cheng-Chen Lin ◽  
Yu-Chin Lee

Abstract. The present study proposed that, unlike prior leader–member exchange (LMX) research which often implicitly assumed that each leader develops equal-quality relationships with their supervisors (leader’s LMX; LLX), every leader develops different relationships with their supervisors and, in turn, receive different amounts of resources. Moreover, these differentiated relationships with superiors will influence how leader–member relationship quality affects team members’ voice and creativity. We adopted a multi-temporal (three wave) and multi-source (leaders and employees) research design. Hypotheses were tested on a sample of 227 bank employees working in 52 departments. Results of the hierarchical linear modeling (HLM) analysis showed that LLX moderates the relationship between LMX and team members’ voice behavior and creative performance. Strengths, limitations, practical implications, and directions for future research are discussed.


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