Related items
Showing items related by metadata.
-
DocumentBiomass estimation in mangrove forests: a comparison of allometric models incorporating species and structural information
XV World Forestry Congress, 2-6 May 2022
2022Also available in:
No results found.Improved estimates of aboveground biomass are required to improve our understanding of the productivity of mangrove forests to support the long-term conservation of these fragile ecosystems which are under threat from many natural and anthropogenic pressures. To understand how individual species affects biomass estimates in mangrove forests, five species-specific and four genus-specific allometric models were developed. Independent tree inventory data were collected from 140 sample plots to compare the aboveground biomass (AGB) among the species-specific models and seven existing frequently used pan-tropical and Sundarbans-specific generic models. The effect of individual tree species was also evaluated using model parameters for wood densities (from individual trees to the whole Sundarbans) and tree heights (individual, plot average and plot top height). All nine species-specific models explained a high percentage of the variance in tree AGB (R2 = 0.97 to 0.99) with the diameter at breast height (DBH) and total height (H). At the individual tree level, the generic allometric models overestimated AGB from 22% to 167% compared to the species-specific models. At the plot level, mean AGB varied from 111.36 Mg ha-1 to 299.48 Mg ha-1, where AGB significantly differed in all generic models compared to the species-specific models (p < 0.05). Using measured species wood density (WD) in the allometric model showed 4.5% to 9.7% less biomass than WD from a published database and other sources. When using plot top height and plot average height rather than measured individual tree height, the AGB was overestimated by 19.5 % and underestimated by 8.3% (p < 0.05). The study demonstrates that species-specific allometric models and individual tree measurements benefit biomass estimation in mangrove forests. Tree level measurement from the inventory plots, if available, should be included in allometric models to improve the accuracy of forest biomass estimates, particularly when upscaling individual trees up to the ecosystem level. Keywords: Climate change, Monitoring and data collection, Sustainable forest management ID: 3621710 -
DocumentLocal climate mediates spatial and temporal variation in carabid beetle communities in three forests in Mount Odaesan, Republic of Korea
XV World Forestry Congress, 2-6 May 2022
2022Also available in:
No results found.Global environmental change can dramatically alter the composition of floral and faunal communities, and elucidating the mechanisms underlying this process is important for predicting its outcomes. Studies on global climate change have mostly focused on statistical summaries within wide spatial and temporal scales; less attention has been paid to variability in microclimates at narrower spatial and temporal scales. The microclimate is the suite of climatic conditions measured in a local area. Environmental variables at the microclimatic scale can be critical for the ecology of organisms inhabiting each area. We examined the effect of spatial and temporal changes in the microclimate on the ecology of carabid beetle communities in three sites on Mount Odaesan, Korea. Our results demonstrate the importance of regular surveys of communities at local scales. Such surveys are expected to reveal an additional fraction of variation in communities and underlying processes that have been overlooked in studies of global community patterns and change. Keywords: Research ID: 3622034 -
DocumentExploration of new natural enemies of the asian longhorned beetle (Coleoptera: Cerambycidae) in China using sentinel host eggs and larvae
XV World Forestry Congress, 2-6 May 2022
2022Also available in:
No results found.Asian longhorned beetle (ALB), Anoplophora glabripennis (Motschulsky) is a polyphagous wood boring pest that attacks many economically important orchard, roadside, ornamental and forest trees (>100 species). Due to the widespread planting of poplars and willows, it has become one of the most serious forest pests in China and the Korean Peninsula. This cerambycid has also invaded North America and Europe. In order to control ALB in China, many techniques have been employed such as forest management, traps, insecticides, and biological control. Prior to this study, two native polyphagous parasitoids, Sclerodermus guani and Dastarcus helophoroides are currently being used throughout China to control ALB, and few other parasitoids have been reported parasitizing ALB. In order to find specialist parasitoids of ALB, the Chinese Academy of Forestry and USDA-APHIS have carried out a biocontrol program in China since 2015 by applying the technique of deploying ALB-infested sentinel logs to attract parasitoids in three different sites of China (Beijing, Shanghai, and Jilin). From 2015 to 2020, our survey detected 12 species of hymenopteran parasitoids attacking sentinel Asian longhorned beetle larvae or eggs, namely, Bracon planitibiae Yang, Cao et Gould, Iphiaulax impostor (Scopoli), Spathius glabripennis sp.nov. (Unpublished), Zombrus bicolor (Enderlein) (Braconinae), Callocleonymus beijingensis Yang, Oxysychus scolyti Yang, Zolotarewskya robusta glabripennis ssp. nov. (unpublished), Zolotarewskya anoplophora sp.nov. (unpublished) (Pteromalidae), Eurytoma morio Boheman (Eurytomidae), Eupelmus urozonus Dalman (Eupelmidae), Sclerodermus guani Xiao et Wu (Bethylidae) and Xorides sp. (Ichneumonidae). Total parasitism by all these parasitoids was 7–16% in Beijing, 4–11% in Shanghai, and 0–0.2% in Jilin Province, among which, Spathius glabripennis sp.nov and Oxysychus scolyti with rates of parasitism are 1-4% and 2-10% respectively. Keywords: Biodiversity conservation, Sustainable forest management, Research, Innovation ID: 3480709
Users also downloaded
Showing related downloaded files
No results found.