The Connections between Above-Ground Biomass and Plant Diversity of Roadside Trees, Density and Diversity on Different Types of Roads in Karachi
Mir Muhammad Nizamani 1  
,   Uzair Aslam Bhatti 2  
,   Xia-Lan Cheng 3  
,   Feroz Gul Nizamani 4  
,   Raza Ali Rind 4  
,   Aamir Ali Khokhar 1  
,   Chang-Wang Ma 5, 6,   Zeeshan Zeeshan 7,   Saraj Bahadur 8,   Dong-Mei Yang 5, 6  
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Hainan Key Laboratory for Sustainable Utilization of Tropical Bioresources, College of Tropical Crops, Hainan University, Haikou 570228, China
School of Geography, Nanjing Normal University
Lingnan Normal University, Guangdong, China, 520428
Department of Plant Breeding and Genetics Faculty of Crop Production, Sindh Agriculture University Tandojam, Pakistan
College of Horticulture, Hannan University, Haikou 570228, China
Key Laboratory for Quality Regulation of Tropical Horticultural Plants of Hainan Province, Haikou 570228, China
Kymeta Corporation, Redmond Washington, USA
College of Forestry, Hainan University, Haikou, China
Dong-Mei Yang   

College of Horticulture, Hannan University, Haikou 570228, China
Submission date: 2020-07-29
Final revision date: 2020-09-22
Acceptance date: 2020-10-18
Online publication date: 2021-02-08
Although Karachi city is one of the world’s fastest growing cities and considered one of the largest cities of the world, not much is known about its roadside trees. The roadside trees of different types of roads (e.g. Wide roads, Medium roads) in Karachi city of Sindhi, Pakistan were studied. Based on the field sample survey, tree species diversity of different types of roads were examined through different diversity indexes. Furthermore, the relationship between above ground biomass and biodiversity was studied by linear regression model. A total of 180 plots were surveyed, which were divided into three main types of roads. The most significant amount of tree biomass per unit area was found in Wide roads 4.27 kg/m2, followed by medium roads. The least biomass per unit area was found in the narrow roads, where trees biomass per unit area was 2.44 kg/m2. A single or a small number of species dominate in the observed area that decline the species diversity. A nonnative species Conocarpus erectus revealed dominance which was followed by Guaiacum officinale on all types of roads. Overall, 76 species (32 nonnatives and 44 natives) were noted, which were very disproportionately distributed in the roadside of the city.