scholarly journals Floristic composition, woody species diversity, and spatial distribution of trees based on architectural stratification in a subtropical evergreen broadleaf forest on Ishigaki Island in the Ryukyu Archipelago, Japan

Tropics ◽  
2009 ◽  
Vol 18 (3) ◽  
pp. 103-114 ◽  
Author(s):  
S.M. FEROZ ◽  
Min WU ◽  
Sahadev SHARMA ◽  
Yan LI ◽  
Rempei SUWA ◽  
...  
Keyword(s):  
Spatial Distribution ◽  
Species Diversity ◽  
Floristic Composition ◽  
Woody Species ◽  
Ryukyu Archipelago ◽  
Broadleaf Forest ◽  
Ishigaki Island ◽  
Woody Species Diversity

scholarly journals Comparative Studies on Architectural Stratification and Woody Species Diversity in Subtropical Evergreen Broadleaf Forests Along a Latitudinal Thermal Gradient of the Ryukyu Archipelago, Japan

2014 ◽  
Author(s):  
S. M. Feroz ◽  
Rempei Suwa ◽  
Koh Nakamura ◽  
Akio Hagihara ◽  
Masatsugu Yokota
Keyword(s):  
Species Diversity ◽  
Thermal Gradient ◽  
Floristic Composition ◽  
Woody Species ◽  
Bottom Layer ◽  
Okinawa Island ◽  
Ishigaki Island ◽  
Number Of Species ◽  
Woody Species Diversity ◽  
Degree Of Similarity

ABSTRACTIn order to compare stand structure and woody species diversity of subtropical evergreen broadleaf forests along a latitudinal thermal gradient of the Ryukyu Archipelago, tree censuses in a 750 m2 plot in Okinawa Island and a 400 m2 plot in Ishigaki Island were performed. The number of layers increased along a latitudinal thermal gradient from four in the forest of Okinawa Island to five in the forest of Ishigaki Island. The values of Shannon’s index H′ and Pielou’s index J′ tended to increase from the top layer downward in the forest of Okinawa Island, whereas in the forest of Ishigaki Island, these values tended to increase from the bottom layer upward. High woody species diversity depended on small-sized trees in the Okinawa forest, whereas it depended on large-sized trees in the Ishigaki forest. The woody species diversity is higher in the Okinawa forest (H′ = 4.83 bit) than in the Ishigaki forest (H′ = 4.36 bit). According to successively decreasing height of layers from the top downward, the value of H′ increased continuously from the top layer downward in the Okinawa forest. This increasing trend was different from the Ishigaki forest, where the value of H′ increased up to the second layer and then decreased downward. In the Okinawa forest, the expected number of species increased continuously from the top toward the bottom layer, i.e. the bottom layer contained the highest potential number of species (65). However, in the Ishigaki forest, it increased from the top to the fourth layer and then decreased to the bottom layer, i.e. the fourth layer contained the highest potential number of species (90). The floristic composition in the Okinawa forest was different from that in the Ishigaki forest in terms of similarity index, though approximately half of the species were common between them. The highest degree of similarity in floristic composition was between the second and third layers in the Okinawa forest, whereas it was between the third and bottom layers in the Ishigaki forest. The degree of similarity in floristic composition among layers was higher in the Okinawa forest than in the Ishigaki forest. Except the top and the bottom layer respectively in the forests of Okinawa Island and Ishigaki Island, the spatial distribution of trees was random in each layer. The degree of overlapping in the spatial distribution of trees among layers in these two forests suggested that trees in the upper two layers in the Ishigaki forest can catch sufficient light, while light can not penetrate easily to the lower three layers in both of the forests. As a result, almost species in the lower layers might be shade-tolerant in both of the forests. For both of the forests, mean tree weight of each layer decreased from the top downward, whereas the corresponding tree density increased from the top downward. This trend resembled the mean weight–density trajectory of self-thinning plant populations.

Woody species diversity and coffee production in remnant semi-natural dry Afromontane Forest in Zegie Peninsula, Ethiopia

2018 ◽  
Vol 93 (5) ◽  
pp. 1793-1806 ◽  
Author(s):  
Beyene Belay ◽  
Solomon Zewdie ◽  
Wolde Mekuria ◽  
Abrham Abiyu ◽  
Dagninet Amare ◽  
...  
Keyword(s):  
Species Diversity ◽  
Woody Species ◽  
Coffee Production ◽  
Afromontane Forest ◽  
Woody Species Diversity ◽  
Dry Afromontane Forest

scholarly journals The Use of Homegarden Agroforestry Systems for Climate Change Mitigation in Lowlands of Southern Tigray, Northern Ethiopia

2019 ◽  
pp. 1-13
Author(s):  
Gebru Eyasu Siyum ◽  
Tuemay Tassew
Keyword(s):  
Climate Change ◽  
Species Diversity ◽  
Climate Change Mitigation ◽  
Woody Species ◽  
Agroforestry Systems ◽  
Carbon Stocks ◽  
Land Uses ◽  
Woody Species Diversity ◽  
Soil Carbon Stocks ◽  
Change Mitigation

Mitigation of climate change is one of the major environmental challenges facing the globe. In this context, homegarden agroforestry systems (HGAFs) have large potential for climate change mitigation. Therefore, this study was initiated to estimate the biomass and soil carbon stocks of HGAFs in relation to adjacent Natural Forest (NF). It also analyzed the relationship between woody species diversity, evenness and richness with biomass and soil carbon stocks. Three sites were purposely selected on the basis of the presence of HGAFs and NF adjacent to each other. Random sampling was used to select representative homegardens from the study population. In NF, a systematic sampling technique was employed. A total of 60 plots with a size of 10 m x 20 m were used to collect vegetation and soil data in both land uses. Soil samples were collected from each plot of the samples laid for vegetation sampling. Accordingly, 120 composite and 120 undisturbed soil samples from 0-30 cm and 30-60 cm soil depths were collected for soil organic carbon (SOC) and bulk density analysis respectively. Biomass estimation for each woody species was analyzed by using appropriate allometric equations. The result showed that the total amount of carbon stocks was 148.32±35.76 tons ha-1 and 157.27±51.61 tons ha-1 in HGAFs and adjacent NF respectively which did not vary significantly between the two studied land uses (P > 0.05). The finding also shows a positive but non-significant (P>0.05) relationship between carbon stocks and woody species diversity, richness, and evenness. Specifically, in NF lands, woody species diversity with SOC (r=0.36) and in HGAFs species richness with biomass carbon (r=0.39) was correlated positively and significantly (P=0.05). We concluded that HGAFs have the same potential as the NF for carbon stock accumulation and to counteract the loss of biomass.

Sign in / Sign up

Export Citation Format

Share Document