The role of trees for sustainable management of less-favored lands: the case of eucalyptus in Ethiopia

Jagger, Pamela; Pender, John

doi:10.1016/s1389-9341(01)00078-8

Cited by 200 publications

(161 citation statements)

References 25 publications

(38 reference statements)

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“…In this study, three measured soil properties (pH, TN and TP; Table 2) beneath Eucalyptus camaldulensis dramatically decreased and there was also a declining trend for AP, TK, and AK (Table 2). That is to say, restoring Eucalyptus camaldulensi led to soil nutrient depletion which resulted in soil degradation (Jagger and Pender 2003).…”

Section: Discussionmentioning

confidence: 99%

Effects of vegetation restoration types on soil quality in Yuanmou dry-hot valley, China

Peng

Chen

Fang

et al. 2013

Soil Science and Plant Nutrition

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Soil erosion has resulted in serious land degradation in Yuanmou dry-hot valley, Yunnan province, China. Vegetation restoration had been widely developed in this hot and arid area. In this work we investigate the quality of rhizosphere soils under four restoration species in the towns of Zuolin (gully bed) and Yuanma (slope area). [pH, soil organic matter, nitrogen (N), phosphorus (P) and potassium (K) contents], and microbial (microbial biomass and microbe quantity) properties and soil enzyme (catalase, protease and urease) activities were determined. Compared to the soils collected from other vegetation types, the soil under Leucaena leucocephala had the highest content of soil organic matter, total N, available N, total P, available P, available K, microbial biomass carbon (C), and the highest microbe quantity and enzyme activities. Five parameters (organic matter, pH, microbial biomass N, total K and protease activity), which had the greatest weight in the principal components analysis, were selected to calculate the soil quality index (SQI). The final SQI values implied that restoring Leucaena leucocephala greatly improved the soil quality, while restoration with Eucalyptus camaldulensis decreased the soil quality of the slope area. Plant recovery with Dodonaea viscosa and Heteropogon contortus on the gully bed affected the population of soil microbial communities but didn't improve the SQI values. It can therefore be seen that types of plants used for recovery in gully-developed regions in dry-hot valleys must be chosen cautiously: Leucaena leucocephala is a good choice for soil revegetation of the slope area, but the revegetation patterns on the gully bed still need further study.

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Section: Discussionmentioning

confidence: 99%

Effects of vegetation restoration types on soil quality in Yuanmou dry-hot valley, China

Peng

Chen

Fang

et al. 2013

Soil Science and Plant Nutrition

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“…The most commonly planted trees in community woodlots are eucalyptus trees (especially globulos and camaldulensis). The average price of eucalyptus poles in the highlands of Tigray was about 28 EB per pole in 1998 (Jagger and Pender, 2000). Considering the average planting density (about 4,500 trees per ha) and survival rate (64 per cent) reported in table 3, a woodlot of average-sized eucalyptus trees would be worth more than 80,000 EB per ha.…”

Section: Environment and Development Economics 139mentioning

confidence: 99%

“…The negative association of external promotion with tree survival suggests that external programs may not be achieving full participation of local communities in promoting woodlots. Part of the problem may be that local communities often prefer to plant eucalyptus, which survive well and grow rapidly under the uncertain-rainfall of Tigray, whereas external organizations sometimes promote other species that may be less hearty or less preferred by local households (Jagger and Pender, 2000).…”

Section: Econometric Analysismentioning

confidence: 99%

Community natural resource management: the case of woodlots in Northern Ethiopia

Gebremedhin¹,

Pender

Tesfay

2003

Envir. Dev. Econ.

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ABSTRACT. This paper examines the nature of community management of woodlots and investigates the determinants of collective action and its effectiveness in managing woodlots, based on a survey of 100 villages in Tigray, northern Ethiopia. Despite limited current benefits received by community members, the woodlots contribute substantially to community wealth, increasing members' willingness to provide collective effort to manage the woodlots. We find that benefits are greater and problems less on woodlots managed at the village level than those managed at a higher municipality level, and that the average intensity of management is greater on village-managed woodlots. The factors that do significantly affect collective action include population density (higher collective labor input and lower planting density at intermediate than at low or high density), market access (less labor input, planting density and tree survival where market access is better), and presence of external organizations promoting the woodlot (reduces local effort to protect the woodlot and tree survival). The finding of an inverse U-shaped relationship between population density and collective labor input is consistent with induced innovation theory, with the increased labor/land ratio promoting collective effort to invest in resources as population density grows to a moderate level, while incentive problems may undermine collective action at high levels of population density. These findings suggest collective action may be more beneficial and more effective when managed at a more local level, when the role of external organizations is more demand-driven, and when promoted in intermediate population density communities more remote from markets. In higher population density settings and areas closer to markets, private-oriented approaches are likely to be more effective.

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“…For the past two decades, woodlots have been promoted in rural areas of Africa as a means of improving woodfuel supply and poles in rural communities. A number of countries such as South Africa (Ham 2000), Tanzania (Shanks 1990) and Ethiopia (Jagger and Pender 2005) initially promoted communal woodlots, but due to labour constraints and lack of autonomy many farmers prefer individual woodlots planted on their own parcels of land. In recent years, many non-governmental organizations (NGOs) have been encouraging farmers to plant woodlots through agroforestry so that they can be self sufficient in wood product requirements.…”

Section: Woodlot Technologymentioning

confidence: 99%

Gender and agroforestry in Africa: a review of women’s participation

2011

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This paper presents a review of agroforestry in Africa from a gender perspective. It examines women's participation relative to men and the challenges and successes they experience. Particular agroforestry practices examined include fodder production and utilization, soil fertility management, woodlots and indigenous fruit and vegetable production and processing. The review shows that agroforestry has the potential to offer substantial benefits to women; however, their participation is low in enterprises that are considered men's domain, such as timber and high in enterprises that have little or no commercial value, such as collection of indigenous fruits and vegetables. Furthermore, the degree of women's involvement relative to men in technologies such as soil fertility management, fodder production and woodlots is fairly high in terms of proportion of female-headed households participating but is low as measured by the area they allocate to these activities and the number of trees they plant. Data on whether women are able to manage agroforestry practices as well as men are mixed, although it is clear that women do most of the work. In cases where they do not perform well, the reasons are mostly due to scarcity of resources. In marketing, women are confined to the lower end of the value chain (retailing), which limits their control over and returns from the productive process. In order to promote gender equity in agroforestry and to ensure that women benefit fully, the paper recommends various policy, technological and institutional interventions. These include (1) facilitating women to form and strengthen associations, (2) assisting women to improve productivity and marketing of products considered to be in womens' domain and (3) improving women's access to information by training more women extension staff, holding separate meetings for women farmers, and ensuring that women are fully represented in all activities.

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The role of trees for sustainable management of less-favored lands: the case of eucalyptus in Ethiopia

Cited by 200 publications

References 25 publications

Effects of vegetation restoration types on soil quality in Yuanmou dry-hot valley, China

Effects of vegetation restoration types on soil quality in Yuanmou dry-hot valley, China

Community natural resource management: the case of woodlots in Northern Ethiopia

Gender and agroforestry in Africa: a review of women’s participation

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