Tree planting on degraded lands play a key role in forest rehabilitation processes through afforestation and/or reforestation. Moisture harvesting structures (MHSs) has significant impact on seedling survivals at degraded lands. The objectives of this study were to investigate the impact of water harvesting techniques on seedling survival and growth performance of trees. Field experiments were conducted for two rainy seasons in southern Tigray, Atsela watershed. The experimental design followed was the split plot design. The MHSs as main plot used were eye-brow basins (EBs), micro trench (MTs), improved pit (IPs) and as control normal pit (NPs). The tree species grown as subplots were Eucalyptus camaldulensis, Grevillea robusta, Olea europaea and Cupressus lusitanica. The four tree species were planted by using seedlings. The tree survival rate, height, crown width (CW) and root collar diameter (RCD) of the four tree species were measured every six months after transplanting. The result shows that MHSs were significant in tree seedling height, CW and RCD but not in tree survival rate. Tree seedling height and CW grown in EBs were significantly higher than those grown in MTs, IPs and NP (P≤0.05). RCD of tree seedling was higher when grown in EBs than NP (control) (P≤0.05). The interaction of tree species seedlings and MHSs shows that those seedlings grown on MHSs were significantly thicker, taller and more survived than those grown on the NPs (control) (P≤0.05). So based on the experiments, it is concluded that MHSs particularly the eyebrow basin was considered as the most appropriate planting pit. Therefore, further demonstration of eyebrow basin tree planting should be carried out.
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.
The overall objective of the study was to map trees outside forest (TOF) in croplands, and their contribution to the supply of ecosystem services for local and national beneficiaries using participatory research, Google Earth and ArcMap in Ghana, as the case study area. A satellite image available from Google Earth was used to map croplands, and ArcMap was used to calculate the local and national ecosystem service hot spot areas based on the values assigned to each TOF individuals. The research identified and mapped a total of 786 TOF individuals and 50 TOF species in 147 ha of croplands in the study area. Ficus exasperate, Morinda lucida, Ceiba pentandra, Spathodea campanulata, Mangifera indica, Sterculia tragacantha, Funtumia elastic, Ficus carpensis, Vernonia amygdalina and Trilipisium madagascariense were the top ten most dominant species in terms of species occurrence. Fifteen different local ecosystem services supplied by TOF species, and the hotspot areas were identified and mapped. The total carbon stored by all 786 TOF in 147 ha of the study area was 759 tons of carbon. The most important TOF species and hotspot locations that require special planning, conservation, and management focus were identified and mapped. There was a poor correlation between the importance and location of the key species for local and national beneficiaries which might lead to a conflict of interest and illegal tree felling.
In the varying climate and weather environments and fast-growing population, the production of feed that could meet the demand of this ever-growing population will be challenging with limited land, soil, and water resources. In many developing countries, terraces have been constructed in sloppy, hilly and valley areas to rectify their shortage of cultivated land and severe water erosion problems to meet livelihood demands. In the southern zone of Tigray region, various labor-intensive bench terraces (BTs) have been constructed and are on the way of construction. Despite its coverage and labor intensiveness, these terraces are facing problems such as malfunctioning and collapse of structures leading to unsustainability, unproductiveness and additional labor and material costs. Thus, this study was designed to identify the basis of the above-mentioned problems and to put real solutions for the problems. A multi-disciplinary evaluation of BTs from natural resources and socioeconomic researchers was conducted to identify observational gaps in the stability and sustainability of the terraces and to put ways forward. Technical assessment and measurement of BTs were conducted onsite to evaluate and compare the specification with the recommended specification. Inappropriate site selection, water scarcity, free-grazing and neglected maintenance, poor buffer zone, and stone placement were directly or indirectly major reasons for the failure of bench terrace (BT) structures. Most of the BTs were not supported with biological soil and water conservation materials. Site selection and technical standards of BTs should be done based on recommended specifications with continuous follow-up.
The overall objective of the study was to assess and compare the role of gender in identifying and prioritizing the ecosystem services of trees in croplands. The research was carried out in croplands and species inventory in each cropland was conducted during field observations of every tree species by interviewing the local farmers and/or villagers. A questionnaire containing both close-ended and open-ended questions were designed to collect information about the role of gender in identifying and prioritizing the ecosystem services supplied by each tree species in croplands based on local communities. A total of 15 ecosystem services were identified from trees in croplands by both men and women. The number and type of ecosystem services identified by men and women were different. The differences could be due to different access and benefits from ecosystem services. As a result, their perception and knowledge of ecosystem services could also vary. After identification of each ecosystem service, a paired two-tail t-test was conducted whether the list of individual score values given to each local ecosystem services identified by both men and women were the same or not. The statistical result of the paired t-test showed that the score values of all the ecosystem services that are only identified by both men and women were not statistically significant. This can imply that the commonly identified ecosystem services have more or less similar importance to men and women. The findings in this research demonstrate that ecosystem services identification might cause gender biases on women due to neglected control and access to the ecosystem services of trees in croplands which in turn could have an impact on tree resource management, conservation, and development interventions. Therefore, integrating women in ecosystem service access and control can help build various experiences of gender and balanced institutions which can aid collective and effective tree and forest resource management and to maximize the benefits for all beneficiaries of the ecosystem services.
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