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ArticleImpact of rubber tree plantations chronosequence on soil fertility and soil organic carbon stocks, Gurafarda District, Southwest Ethiopia
XV World Forestry Congress, 2-6 May 2022
2022Also available in:
No results found.Rubber tree is one of the important commercial commodities in the globe. This study was conducted to examine the change in soil fertility and soil organic carbon stocks following conversion of forest to rubber plantation of different ages (5, 10, 15, 20 and 25 years) and coffee agroforestry. The field experiment was conducted in Guraferda district, Southwest Ethiopia. The soil samples were collected from 20× 20 m 2 plots at 30 cm depth, with three replicates at a 100 m interval. A total of 42 soil samples were taken from the three land-use types. The soil moisture content (MC), porosity, soil pH, organic carbon (OC), total nitrogen (N), available phosphorous (P), exchangeable bases, CEC (cation exchange capacity) and base saturation (B)S content of the NF (natural forest), CA(coffee agroforestry) and old age rubber plantation (RP15, RP20 and RP25) were higher than the early years of rubber plantation (RP5 and RP10). The highest soil organic carbon stocks (SOC) were recorded in NF (114.3 Mg ha -1 ), CA (112.2 Mg ha -1 ), RP25 (98.5 Mg ha -1 ) and RP20 (97.8 Mg ha -1 ). The SOC loss because of conversion of NF to RP5 (11.0 Mg ha -1 y -1), RP10 (5.3 Mg ha -1 y -1 ), RP15 (2.3 Mg ha -1 y -1 ), RP20 (0.8 Mg ha -1 y -1 ), RP25 (0.6 Mg ha -1 y -1 ) and CA (0.1 Mg ha -1 y -1 ). In general, old age rubber plantation (RP20 and RP25) showed proportional levels of soil fertility and soil organic carbon stocks compared with the natural forest and the coffee agroforestry. Since all physico-chemical characteristics were low at the early years of rubber plantation, we recommend to supplement significant proportions of nutrient to the early years of rubber plantation (0-10 years). Keywords: Rubber plantation, Land use types, Physico-chemical characteristics, Soil organic carbon stocks, Organic carbon loss. ID: 3605459 -
ArticleAdaptation of eucalyptus urophylla to volcanic land of Batur mountain forest, Indonesia
XV World Forestry Congress, 2-6 May 2022
2022Also available in:
No results found.Batur Forest is a volcanic area that was ex-volcanic eruption. Efforts to rehabilitate forests with a critical land was by planting Eucalyptus urophylla. The aim of the study was to examine the adaptation of Eucalyptus urophylla species in critical areas of former volcanic eruptions that was dominated by hard rocks. The researches were done for a year (2019-2020). The method used was species test with permanent block plot design from 4 age levels, 1 year, 5 years, 10 years and 15 years. The study results showed growth of 1.02 cm in diameter and 1.10 m in height (1 year), 6.50 cm in diameter and 11.00 m in height (5 years), 13.25 cm in diameter and 18.40 m in height (10 years) and a diameter of 20.48 cm and a height of 23.00 m (15 years). Eucalyptus urophylla experienced the best tree diameter growth after 10 years old and on the contrary experienced a decrease in height. The Eucalyptus urophylla level of adaptation and suitability of on volcanic soils with low fertility and rocky soil is a recommendation to increase the quantity of this species of planting. So that the forest succession from rocky thickets to tree vegetation is faster than natural processes. Eucalyptus urophylla species is one of the flora that make up the savanna forest ecosystem and volcanic critical land in eastern Indonesia. Keywords : Adaptation, Eucalyptus urophylla, Volcanic land, Batur mountain forest ID: 3623267 -
ArticleScientific basis of household practices in agroforestry homegardens: A case study in Matara district, Sri Lanka
XV World Forestry Congress, 2-6 May 2022
2022Also available in:
No results found.Agroforestry in homegardens with high diversity of species which play main agro-ecological roles are complex and sustainable land use systems. Efforts are being made across the globe in valuing and protecting the age-old practices of agroforestry on scientific basis in homegardens. This study analysed the scientific basis of households’ practices in agroforestry homegardens in Matara district of Sri Lanka and develop strategies for the promotion of sustainable agroforestry homegardens. Selected households were interviewed measuring their concern using five point Likert scale, and analysed the qualitative data using non-parametric statistics. The study revealed that scientific basis of household practices in agroforestry homegardens are moderate in selection of appropriate trees and plants, and management of trees and plant health care. Households pay little concern on scientific basis in planning and site placement, land preparation and establishment of trees / crops, and implementing proper cultural practices. There is no significant correlation between scientific basis of practices in agroforestry in relation with size of home-gardens, educational level of households, and across the category of their occupations. Resources to use scientific knowledge in practice, and opportunity to improve scientific skills have moderate correlation significantly while availability of scientific information and access to scientific knowledge have significant but low correlation as applying knowledge on scientific basis by the households. The interest to acquire scientific knowledge, and sufficient time to improve scientific knowledge, and other reasons have no significant correlation with scientific basis of household practices. Carefully planned interventions including policy adjustments and effective extension programs for learning and experimenting couple with supportive programs would enhance scientific basis of household practices for agroforestry in homegardens. Key words: homegarden composition; plants selection; health-care management; resources use; agroforestry policy ID: 3620081
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