Carbon accumulation in agroforestry systems is affected by tree species diversity, age and regional climate: A global meta‐analysis

2020 ◽  
Vol 29 (10) ◽  
pp. 1817-1828 ◽  
Author(s):  
Zilong Ma ◽  
Han Y. H. Chen ◽  
Edward W. Bork ◽  
Cameron N. Carlyle ◽  
Scott X. Chang
Keyword(s):  
Species Diversity ◽  
Tree Species ◽  
Meta Analysis ◽  
Regional Climate ◽  
Agroforestry Systems ◽  
Carbon Accumulation ◽  
Tree Species Diversity

scholarly journals Assessment of Farm Characteristics and Woody Species Diversity in Hadiya Zone, Southern Ethiopia

2021 ◽  
Vol 16 (1) ◽  
Author(s):  
Yohanneshoramo More ◽  
Kibemo Detamo Aga
Keyword(s):  
Species Diversity ◽  
Tree Species ◽  
Woody Species ◽  
Agroforestry Systems ◽  
Farm Size ◽  
Southern Ethiopia ◽  
Tree Species Diversity ◽  
Wealth Status ◽  
Woody Species Diversity ◽  
Hadiya Zone

Diversification of trees and other agricultural crops allowed the traditional agroforestry systems of southern Ethiopia to be considered as sustainable farming systems. But their sustainability has been threatened overtime. The study was conducted in Hadiya zone, southern Ethiopia with the aim to characterize tree species diversity on farms and to investigate link of tree species diversity to farm characteristics. A complete on-farm tree inventory was carried out on farms of 108 randomly selected households. A total of 108 trees and shrub species were recorded, of which 24% were exotics. The mean number of tree species per farm was 29, ranging between 11– 65. The highest number of tree species was recorded relatively closest to the market center. Thirteen different farm field types were identified, of which “enset” was with largest number of tree species. The highest and lowest mean number of tree species was identified and recorded. Dissimilarity in composition of tree species among the districts ranged between 0.30 – 0.45. A significant correlation (P<0.05) was found between farm size, wealth status and distance of farms from the market. Woody species diversity is well acknowledged in the study area but further studies of woody species in relation to usage diversity seem important.

Tree species diversity influences herbivore abundance and damage: meta-analysis of long-term forest experiments

Oecologia ◽  
2007 ◽  
Vol 152 (2) ◽  
pp. 287-298 ◽  
Author(s):  
Harri Vehviläinen ◽  
Julia Koricheva ◽  
Kai Ruohomäki
Keyword(s):  
Species Diversity ◽  
Tree Species ◽  
Meta Analysis ◽  
Tree Species Diversity

scholarly journals Tree Species Diversity, Composition and Aboveground Biomass Across Dry Forest Land-Cover Types in Coastal Ecuador

2021 ◽  
Vol 14 ◽  
pp. 194008292199541
Author(s):  
Xavier Haro-Carrión ◽  
Bette Loiselle ◽  
Francis E. Putz
Keyword(s):  
Species Diversity ◽  
Land Cover ◽  
Community Composition ◽  
Aboveground Biomass ◽  
Tree Species ◽  
Dry Forest ◽  
Stem Density ◽  
Tree Species Diversity ◽  
Land Cover Types ◽  
Schizolobium Parahyba

Tropical dry forests (TDF) are highly threatened ecosystems that are often fragmented due to land-cover change. Using plot inventories, we analyzed tree species diversity, community composition and aboveground biomass patterns across mature (MF) and secondary forests of about 25 years since cattle ranching ceased (SF), 10–20-year-old plantations (PL), and pastures in a TDF landscape in Ecuador. Tree diversity was highest in MF followed by SF, pastures and PL, but many endemic and endangered species occurred in both MF and SF, which demonstrates the importance of SF for species conservation. Stem density was higher in PL, followed by SF, MF and pastures. Community composition differed between MF and SF due to the presence of different specialist species. Some SF specialists also occurred in pastures, and all species found in pastures were also recorded in SF indicating a resemblance between these two land-cover types even after 25 years of succession. Aboveground biomass was highest in MF, but SF and Tectona grandis PL exhibited similar numbers followed by Schizolobium parahyba PL, Ochroma pyramidale PL and pastures. These findings indicate that although species-poor, some PL equal or surpass SF in aboveground biomass, which highlights the critical importance of incorporating biodiversity, among other ecosystem services, to carbon sequestration initiatives. This research contributes to understanding biodiversity conservation across a mosaic of land-cover types in a TDF landscape.

Diversification of tree stands as a means to manage pests and diseases in boreal forests: myth or reality?

2006 ◽  
Vol 36 (2) ◽  
pp. 324-336 ◽  
Author(s):  
Julia Koricheva ◽  
Harri Vehviläinen ◽  
Janne Riihimäki ◽  
Kai Ruohomäki ◽  
Pekka Kaitaniemi ◽  
...  
Keyword(s):  
Species Diversity ◽  
Tree Species ◽  
Boreal Forests ◽  
Tree Mortality ◽  
Tree Species Diversity ◽  
Mixed Stands ◽  
Tree Species Composition ◽  
Pests And Diseases ◽  
Pest Outbreaks ◽  
Disease Epidemics

Pure forest stands are widely believed to be more prone to pest outbreaks and disease epidemics than mixed stands, leading to recommendations of using stand diversification as a means of controlling forest pests and pathogens. We review the existing evidence concerning the effects of stand tree-species diversity on pests and pathogens in forests of the boreal zone. Experimental data from published studies provide no overall support for the hypothesis that diversification of tree stands can prevent pest outbreaks and disease epidemics. Although beneficial effects of tree-species diversity on stand vulnerability are observed in some cases, in terms of reductions in damage, these effects are not consistent over time and space and seem to depend more on tree-species composition than on tree-species diversity per se. In addition, while mixed stands may reduce the densities of some specialized herbivores, they may be more attractive to generalist herbivores. Given that generalist mammalian herbivores cause considerable tree mortality during the early stages of stand establishment in boreal forests, the net effect of stand diversification on stand damage is unlikely to be positive.

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