Area closure for rehabilitation [埃塞俄比亚]
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- 更新:
- 编制者: Daniel Danano
- 编辑者: –
- 审查者: Donia Mühlematter, Fabian Ottiger
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technologies_1048 - 埃塞俄比亚
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全部展开 全部收起1. 一般信息
1.2 参与该技术评估和文件编制的资源人员和机构的联系方式
有助于对技术进行记录/评估的项目名称(如相关)
Book project: where the land is greener - Case Studies and Analysis of Soil and Water Conservation Initiatives Worldwide (where the land is greener)有助于对技术进行记录/评估的机构名称(如相关)
Ministry of Agriculture and Rural Development of Ethiopia (Ministry of Agriculture and Rural Development) - 埃塞俄比亚1.3 关于使用通过WOCAT记录的数据的条件
(现场)数据是什么时候汇编的?:
01/07/2003
编制者和关键资源人员接受有关使用通过WOCAT记录数据的条件。:
是
1.4 所述技术的可持续性声明
这里所描述的技术在土地退化方面是否存在问题,导致无法被认为是一种可持续的土地管理技术?:
否
2. SLM技术的说明
2.1 技术简介
技术定义:
Enclosing and protecting an area of degraded land from human use and animal interference, to permit natural rehabilitation, enhanced by additional vegetative and structural conservation measures.
2.2 技术的详细说明
说明:
Area closure involves the protection and resting of severely degraded land to restore its productive capacity. There are two major types of area enclosures practised in Ethiopia: (1) the most common type involves closing of an area from livestock and people so that natural regeneration of the vegetation can take place; (2) the second option comprises closing off degraded land while simultaneously implementing additional measures such as planting of seedlings, mulching and establishing water harvesting structures to enhance and speed up the regeneration process. The focus of this case study is on this second type.
The selection of measures chosen for rehabilitation depends mainly on the land use type, and to a lesser extent on climate, topography and soil type. Degraded croplands with individual land use rights are normally treated with additional structural measures to retain soil moisture and trap sediment, and with agronomic measures to restore soil fertility. Open access grazing lands are closed for natural regeneration while partly treated with additional measures, and open access woodlands are simply closed. In the case study area 60% of the enclosed area is under treatment with additional conservation measures and 40% is under natural regeneration. First, the area to be closed is demarcated and protected with fencing, usually live fences, and a site guard may be assigned to further ensure protection. Structural measures such as micro-basins, trenches, and bunds that enhance water infiltration and soil moisture may be constructed to increase survival rate of vegetative material planted. Hillside terraces, spaced at a 1 m vertical interval with a width of 1 m are constructed on steep slopes (exceeding 20%). Nitrogen-fixing and multipurpose shrubs/trees (for fodder, fuel) such as Acacia saligna, Sesbania sesban, Leucaena leucocephala as well as local grass species such as napier (Pennisetum purpureum) and rhodes (Chloris gayana) are planted as additional measures for conservation.
The maintenance of area enclosures involves activities such as replanting, maintaining of fences, pruning of trees and weeding. After one year, cut-and-carry of grass for stall-feeding can be partly practiced - which is of economic benefit to the farmers. Rehabilitation normally takes about 7-10 years depending on the level of degradation and intensity of management. Land use is limited to selective cutting of trees, collection of dead wood and cut-and-carry of grass for livestock fodder. On individually owned enclosures land users start cutting trees after three years (for eucalyptus) and after 7–8 years (for other trees), while on communal land farmers are allowed to collect dead wood after 3-–4 years, and the community decides about the use of trees.
2.3 技术照片
2.5 已应用该技术的、本评估所涵盖的国家/地区/地点
国家:
埃塞俄比亚
区域/州/省:
Alaba, South Ethiopia
有关地点的进一步说明:
Bilate River Catchment (Rift Valley)
Map
×2.7 技术介绍
详细说明该技术是如何引入的:
- 通过项目/外部干预
3. SLM技术的分类
3.1 该技术的主要目的
- 改良生产
- 减少、预防、恢复土地退化
- 保护生态系统
3.2 应用该技术的当前土地利用类型
混合(作物/放牧/树木),包括农林
- 林牧业
注释:
Major land use problems (compiler’s opinion): Over 30% of the land in the study area is degraded, resulting in low crop yields and poor livestock production. Severe water erosion is the main cause of land degradation on all slopes, followed by fertility depletion due to intensive cultivation practices and overgrazing. Serious gully formation and a high sediment load in the Bilate River threaten Lake Abaya. Communal grazing lands, woodlands with open access, and cultivated lands on steep slopes without conservation measures are particularly affected. By tradition, land users in rural Ethiopia can own as many livestock as they wish, which encourages overstocking.
Ranching: (before SWC)
Other grazingland: mixed silvo-pastoral (after SWC): cut-and-carry, trees
3.3 有关土地利用的更多信息
该技术所应用土地的供水:
- 雨养
具体说明:
Longest growing period in days: 120 Longest growing period from month to month: Jun - Sep
3.4 该技术所属的SLM组
- 区域封闭(停止使用,支持恢复)
- 横坡措施
3.5 技术传播
注释:
Total area covered by the SLM Technology is 20 m2.
3.6 包含该技术的可持续土地管理措施
3.7 该技术强调的主要土地退化类型
土壤水蚀
- Wt:表土流失/地表侵蚀
- Wg:冲沟侵蚀/沟蚀
- Wo:场外劣化效应
化学性土壤退化
- Cn:肥力下降和有机质含量下降(非侵蚀所致)
生物性退化
- Bc:植被覆盖的减少
- Bs:质量和物种组成/多样性的下降
注释:
Main type of degradation addressed: Wt: loss of topsoil / surface erosion, Wg: gully erosion / gullying, Wo: offsite degradation effects, Cn: fertility decline and reduced organic matter content, Bc: reduction of vegetation cover, Bs: quality and species composition /diversity decline
3.8 防止、减少或恢复土地退化
具体数量名该技术与土地退化有关的目标:
- 修复/恢复严重退化的土地
4. 技术规范、实施活动、投入和成本
4.1 该技术的技术图纸
4.2 技术规范/技术图纸说明
Rehabilitation of degraded land based on enclosure with live fence. Natural regeneration of vegetative cover is supported by water harvesting structures and planting of nitrogen-fixing/multipurpose shrubs and trees as well as local grass species. On steeper slopes hillside terraces may be established.
Technical knowledge required for field staff / advisors: moderate
Technical knowledge required for land users: moderate
Main technical functions: improvement of ground cover, increase of infiltration, control of dispersed runoff, control of concentrated runoff, increase in soil fertility
Secondary technical functions: increase / maintain water stored in soil, less sediment deportation
Mulching
Material/ species: tree leaves/grass
Scattered / dispersed
Vegetative material: T : trees / shrubs
Vegetative measure: oversowing grasses
Vegetative material: G : grass
Vegetative measure: Vegetative material: G : grass
Vegetative measure: Vegetative material: G : grass
Vegetative measure: Vegetative material: G : grass
Trees/ shrubs species: Acacia saligna, Sesbania sesban, Leucaena leucocephala, Eucalyptus spp., Grevillea robusta
Grass species: nepier (Pennisetum purpureum), rhodes (Chloris gayana)
Structural measure: micro-basins (opt.)
Structural measure: terraces (opt.)
Structural measure: bunds (opt.)
Other type of management: land use change, enclosure,, cut-and-carry
4.4 技术建立活动
活动 | 措施类型 | 时间 | |
---|---|---|---|
1. | Planting of trees (Eucalyptus spp., Grevillea robusta) as well as | 植物性的 | (early rainy season). |
2. | Oversowing/interplanting with local grass species: napier grass | 植物性的 | (early rainy season). |
3. | Marking the boundary and establishment of live fences: digging pits | 结构性的 | early rainy season (before June). |
4. | Construction of structural measures such as micro- basins, trenches, bunds or hillside terraces. | 结构性的 | before rains |
4.5 技术建立所需要的费用和投入
对投入进行具体说明 | 单位 | 数量 | 单位成本 | 每项投入的总成本 | 土地使用者承担的成本% | |
---|---|---|---|---|---|---|
劳动力 | Labour | ha | 1.0 | 175.0 | 175.0 | 50.0 |
设备 | Tools | ha | 1.0 | 25.0 | 25.0 | 100.0 |
植物材料 | Seeds | ha | 1.0 | 40.0 | 40.0 | |
植物材料 | Seedlings | ha | 1.0 | 150.0 | 150.0 | |
施工材料 | Stone | ha | 1.0 | |||
施工材料 | Wood | ha | 1.0 | |||
其它 | site guard (kg grain/ha/year) | ha | 1.0 | 1.0 | 1.0 | 100.0 |
技术建立所需总成本 | 391.0 |
注释:
Duration of establishment phase: 2 month(s)
4.6 维护/经常性活动
活动 | 措施类型 | 时间/频率 | |
---|---|---|---|
1. | Mulching with tree leaves/grass around newly planted trees, before | 农业学的 | before rains / initial establishment |
2. | Replanting/gapping up live fence and trees during rains in the early | 植物性的 | during rains / |
3. | Harvesting grass | 植物性的 | during rainy season. / |
4. | Pruning of trees | 植物性的 | in the dry season. / |
5. | Weeding | 植物性的 | after rains. / |
6. | Repairing breaks in structures | 结构性的 | before rains./ |
4.7 维护/经常性活动所需要的费用和投入(每年)
对投入进行具体说明 | 单位 | 数量 | 单位成本 | 每项投入的总成本 | 土地使用者承担的成本% | |
---|---|---|---|---|---|---|
劳动力 | Labour | ha | 1.0 | 35.0 | 35.0 | 100.0 |
设备 | Tools | ha | 1.0 | 5.0 | 5.0 | 100.0 |
植物材料 | Seeds | ha | 1.0 | 10.0 | 10.0 | |
植物材料 | Seedlings | ha | 1.0 | 40.0 | 40.0 | |
其它 | site guard (kg grain/ha/year) | ha | 1.0 | 1.0 | 1.0 | 100.0 |
技术维护所需总成本 | 91.0 |
注释:
Labour for establishment activities: 250 person days per ha for structural measures and planting of trees, plus guarding. Labour for maintenance: 50 person days for replanting/weeding. A common daily wage is US$ 0.70 (= 6 Ethiopian Birr), however in this case the site guards were given 3 kg of grains per ha per year. They can control over 200 ha.
5. 自然和人文环境
5.1 气候
年降雨量
- < 250毫米
- 251-500毫米
- 501-750毫米
- 751-1,000毫米
- 1,001-1,500毫米
- 1,501-2,000毫米
- 2,001-3,000毫米
- 3,001-4,000毫米
- > 4,000毫米
有关降雨的规范/注释:
751-1,000 mm (ranked 1)
1,001-1,500 mm (ranked 2)
农业气候带
- 半湿润
Thermal climate class: tropics
5.2 地形
平均坡度:
- 水平(0-2%)
- 缓降(3-5%)
- 平缓(6-10%)
- 滚坡(11-15%)
- 崎岖(16-30%)
- 陡峭(31-60%)
- 非常陡峭(>60%)
地形:
- 高原/平原
- 山脊
- 山坡
- 山地斜坡
- 麓坡
- 谷底
垂直分布带:
- 0-100 m a.s.l.
- 101-500 m a.s.l.
- 501-1,000 m a.s.l.
- 1,001-1,500 m a.s.l.
- 1,501-2,000 m a.s.l.
- 2,001-2,500 m a.s.l.
- 2,501-3,000 m a.s.l.
- 3,001-4,000 m a.s.l.
- > 4,000 m a.s.l.
关于地形的注释和进一步规范:
Altitudinal zone: Also 1,001-1,500 m a.s.l. (ranked 2) and 2001-2500 m a.s.l. (ranked 3)
Slopes on average: Also hilly (ranked 2) and moderate (ranked 3)
5.3 土壤
平均土层深度:
- 非常浅(0-20厘米)
- 浅(21-50厘米)
- 中等深度(51-80厘米)
- 深(81-120厘米)
- 非常深(> 120厘米)
土壤质地(表土):
- 粗粒/轻(砂质)
- 中粒(壤土、粉土)
表土有机质:
- 低(<1%)
如有可能,附上完整的土壤描述或具体说明可用的信息,例如土壤类型、土壤酸碱度、阳离子交换能力、氮、盐度等。:
Soil depth on average: Also moderately deep (ranked 2) and deep (ranked 3)
Soil fertility: Low
Topsoil organic matter: Also medium and high (both ranked 2)
Soil drainage/infiltration: Good
Soil water storage capacity: Very high
5.6 应用该技术的土地使用者的特征
生产系统的市场定位:
- 生计(自给)
非农收入:
- 低于全部收入的10%
说明土地使用者的其他有关特征:
Off-farm income specification: from petty trade, weaving, etc
5.7 应用该技术的土地使用者拥有或租用的平均土地面积
- < 0.5 公顷
- 0.5-1 公顷
- 1-2 公顷
- 2-5公顷
- 5-15公顷
- 15-50公顷
- 50-100公顷
- 100-500公顷
- 500-1,000公顷
- 1,000-10,000公顷
- > 10,000公顷
5.8 土地所有权、土地使用权和水使用权
土地所有权:
- 州
土地使用权:
- 自由进入(无组织)
- 个人
6. 影响和结论性说明
6.1 该技术的现场影响
社会经济效应
生产
饲料生产
注释/具体说明:
(cut-and-carry of grass)
饲料质量
注释/具体说明:
(cut-and-carry of grass)
木材生产
生产区域
注释/具体说明:
Reduction of grazing area leads to high pressure on remaining grazing areas
收入和成本
农业投入费用
农业收入
注释/具体说明:
(selling grass/wood)
工作量
社会文化影响
社区机构
SLM/土地退化知识
冲突缓解
注释/具体说明:
Unequal share of benefits, some illegal cutting of vegetation is involved
生态影响
水循环/径流
多余水的排放
土壤
土壤水分
注释/具体说明:
>50%
土壤覆盖层
注释/具体说明:
>80%
土壤流失
注释/具体说明:
initially 50% reduction, after 2–3 years
其它生态影响
Soil fertility
注释/具体说明:
increased organic matter, nitrogen fixing shrubs
Biodiversity
注释/具体说明:
recovering disappearing local species
competition between (grass)species
注释/具体说明:
competition between naturally regenerating and oversown (grass)species
6.2 该技术的场外影响已经显现
旱季稳定可靠的水流
注释/具体说明:
Also groundwater recharge
下游洪水
下游淤积
注释/具体说明:
Less sediment transported
地下水/河流污染
6.4 成本效益分析
技术收益与技术建立成本相比如何(从土地使用者的角度看)?
短期回报:
积极
长期回报:
非常积极
技术收益与技术维护成本/经常性成本相比如何(从土地使用者的角度看)?
短期回报:
积极
长期回报:
非常积极
6.5 技术采用
在所有采用这项技术的人当中,有多少人是自发地采用该技术,即未获得任何物质奖励/付款?:
- 90-100%
注释:
300 land user families have adopted the Technology with external material support
90% of land user families have adopted the Technology without any external material support
There is a moderate trend towards spontaneous adoption of the Technology
Comments on adoption trend: Adoption rate has considerably increased owing to improved ownership feeling and immense benefits obtained through the practice. However, if labour-intensive structural measures are required people rely on food-for-work incentives.
6.7 该技术的优点/长处/机会
编制者或其他关键资源人员认为的长处/优势/机会 |
---|
Reduction of on-site and off-site land degradation, reclamation of degraded non-productive land (regenerating fertility) How can they be sustained / enhanced? Strengthen maintenance and protection to increase biomass production of enclosure. |
Fodder shortage is reduced through cut-and-carry of grass in enclosures (after 1 year) How can they be sustained / enhanced? Introduce more productive and nutritious grass/legume species. |
Collection of dead wood from enclosures (after 3–4 years) mitigates fuelwood shortage How can they be sustained / enhanced? Introduce alternative fast growing multi-purpose tree species such as Grevillea robusta (fodder for smallstock in very dry periods). |
Cutting wood for construction of houses and wooden farm implements (after 7–8 years) How can they be sustained / enhanced? Continue planting of multipurpose trees. |
Increased honey production through increased bee activity in enclosures Emerge of springs, which have disappeared due to deforestation/land degradation Income generation: farmers sell grass/wood collected from area enclosures; they make profit despite seven years enclosure How can they be sustained / enhanced? Improve beehives, ‘bee feed’ (bee-friendly plants), and access to market. Maintain proper ground cover to improve infiltration and percolation of rainwater. Better management of planted grass, making of hay, improve market systems. |
Emergence of springs, which have disappeared due to deforestation/land degradation -> Maintain proper ground cover to improve infiltration and percolation of rainwater. - Income generation: farmers sell grass/wood collected from area enclosures; they make profit despite seven years enclosure -> Better management of planted grass, making of hay, improve market systems. Editors’ comments: Protecting degraded land against grazing is a common practice worldwide. In Ethiopia it is the second most important SWC practice after structural conservation measures. About 1.2 million hectares of degraded lands have been closed for rehabilitation in Ethiopia during the past three decades. As this case study shows, results are encouraging both in terms of effective protection and enhanced production. Land use rights: open access on woodlands and grazing lands (communal land use rights), individual on cropland |
6.8 技术的弱点/缺点/风险及其克服方法
编制者或其他关键资源人员认为的弱点/缺点/风险 | 如何克服它们? |
---|---|
On highly eroded areas and in areas with low rainfall the survival rate of trees and shrubs is low and as a result the benefits only come after a very long period. This situation becomes unacceptable to the land users |
Select suitable local and exotic multipurpose tree/shrub species adapted to the local conditions (Acacia spp., Eucalyptus spp., Grevillea robusta etc). Construct water-harvesting structures (trenches, micro-basins). Raise awareness among land users through meetings and training. |
Investment costs are rather high for land users | Credits, loans, cooperatives. |
Inequitable share of benefits | Awareness should be increased through enhancing the LLPP approach. |
7. 参考和链接
7.2 参考可用出版物
标题、作者、年份、ISBN:
Chadokar PA: Multipurpose Plant Species for Soil and Water Conservation. Assistance to Soil and Water ConservationProgramme. ETH/81/003. 1985.
标题、作者、年份、ISBN:
Betru Nedassa: Biological Soil Conservation Measures. Land Rehabilitation and Reforestation Project. Project 2488MOA/WFP. 1995.
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