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Shelterbelts for farmland in sandy areas [中国]

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  • 更新:
  • 编制者:
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  • 审查者:

Farmland shelter belt

technologies_1366 - 中国

完整性: 73%

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

关键资源人

SLM专业人员:
SLM专业人员:

Wang Dogmei

中国

有助于对技术进行记录/评估的机构名称(如相关)
GEF/OP12 Gansu Project (GEF/OP12 Gansu Project) - 中国

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?:

20/05/2002

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。:

1.5 请参阅有关SLM方法的问卷

Shelter Belt
approaches

Shelter Belt [中国]

The shelter belt is a strip or a row of trees planted in a farmland as a wind barrier to protect crops and reduce wind erosion.

  • 编制者: Meili WEN

2. SLM技术的说明

2.1 技术简介

技术定义:

Belts of trees, planted in a rectangular grid pattern or in strips within, and on the periphery of, farmland to act as windbreaks.

2.2 技术的详细说明

说明:

Shelterbelts to protect cropland are a specific type of agroforestry system comprising certain tall growing tree species. Such shelterbelts around farmland help reduce natural hazards including sandstorms, wind erosion, shifting sand, droughts and frost. They also improve the microclimate (reduced temperature, wind speed, soil water loss and excessive wind-induced transpiration) and create more favourable conditions for crop production. Thus the establishment of shelterbelts plays a crucial role in the sandy drylands that are affected by wind and resultant desertification
especially during winter and spring. Where there is irrigation, the shelterbelts protect the infrastructure from silting-up with wind-borne sediment.
Strips of tall growing species (15-25 m) of poplar (Populus spp.) or willow (Salix spp.) were originally (from 1960s onwards) planted in a 400 by 600 m rectangular grid pattern within extensive areas of cropland, with an extra belt of windbreaks on the windward side (against the prevailing wind). Generally, the distance effectively protected is 15-25 times the tree height. Strips are of variable width, consisting of 2-5 tree lines (1-3 m apart) with trees planted every 1-2 m within the lines. Selective felling is used to maintain adequate growing space and the protective effect of the trees.
The impact of the shelterbelts depends on the planting pattern of the trees (the format of strips and grids), the orientation of the shelterbelts in relation to the wind, the spacing between, and the width of each strip and the type of trees planted. The specific design is primarily based on preventing the negative effects of wind, but depends also on local conditions such as the layout of the land, the location of the roads, farm boundaries and irrigation canals. Ideally the tree strips are perpendicular to the prevailing wind direction, and the angle between the strip and the prevailing wind is never less than 45 degrees. The structure of the strips determines the way the wind is controlled, ranging from blocking the wind
to letting it diffuse through semi-permeable shelterbelts. The best effect is achieved if the wind is not blocked entirely, as this can cause turbulence.
The ownership of the land and the shelterbelts still rests with the state, but management has been more and more transferred to individual households. On condition that the impact of the shelterbelt is not affected, the local forestry agencies now allow some felling of mature trees - on a rotational and selective basis, for timber and firewood. Pine trees (Pinus sylvestris var. mongolica and P. tabulaeformis), which command high value as timber for construction, and fruit (and cash) trees like the apricot tree (Prunus armeniace) are increasingly used.

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:

中国

区域/州/省:

Inner Mongolia Autonomous Region

2.6 实施日期

如果不知道确切的年份,请说明大概的日期:
  • 50多年前(传统)

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
注释(项目类型等):

USA and domestic.

3. SLM技术的分类

3.1 该技术的主要目的

  • 降低灾害风险

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

混合(作物/放牧/树木),包括农林

  • 农林业
主要产品/服务:

major cash crop: maize/wheat

注释:

Major land use problems (compiler’s opinion): Strong winds in the winter and spring result in serious natural hazards including sand storms, sand encroachment and wind erosion, while dry and hot winds in the summer increase transpiration leading to plant stress and reduced crop yields.

Major land use problems (land users’ perception): Low yield and intensive wind blow in winter and spring.

如果由于技术的实施而导致土地用途发生变化,则在技术实施前说明土地利的用途。:

Cropland: Ca: Annual cropping

3.3 有关土地利用的更多信息

该技术所应用土地的供水:
  • 混合雨水灌溉
每年的生长季节数:
  • 1
具体说明:

Longest growing period in days: 150Longest growing period from month to month: May - Sep

3.4 该技术所属的SLM组

  • 农业林学
  • 防风林/防护林带

3.5 技术传播

具体说明该技术的分布:
  • 均匀地分布在一个区域
如果该技术均匀地分布在一个区域上,请注明覆盖的大致区域。:
  • 100-1,000 平方千米
注释:

Total area covered by the SLM Technology is 500 m2.

Total SWC Technology area is not clear. This technology area data is from Inner Mongolia forest department. Inner Mongolia autonomy region forest statistic data, 1987, P75. Technology beginning year is from: Water and soil conservation bureau, Yellow River irrigation works committee of Department of water and electricity. Water and soil conservation economy benefit thesis collecting,1987, P45-47.

3.6 包含该技术的可持续土地管理措施

植物措施

植物措施

  • V1:乔木和灌木覆盖层
管理措施

管理措施

  • M1:改变土地使用类型
注释:

Main measures: vegetative measures

Type of vegetative measures: aligned: -against wind

3.7 该技术强调的主要土地退化类型

土壤风蚀

土壤风蚀

  • Et:表土流失
  • Eo:场外劣化效应
水质恶化

水质恶化

  • Ha:干旱化
注释:

Main type of degradation addressed: Et: loss of topsoil, Eo: offsite degradation effects, Ha: aridification

Main causes of degradation: deforestation / removal of natural vegetation (incl. forest fires), poverty / wealth (Lack of captial)

Secondary causes of degradation: overgrazing, education, access to knowledge and support services (Lack of knowledge), Lack of enforcement of legislat./authority

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:
  • 减少土地退化
注释:

Main goals: mitigation / reduction of land degradation

4. 技术规范、实施活动、投入和成本

4.1 该技术的技术图纸

作者:

Mats Gurtner

4.2 技术规范/技术图纸说明

Overview of the shelterbelt layout.
Insert 1: Planting scheme: shelterbelts compromise 2-5 tree lines forming the windbreak about 5-15 m wide and 15-25 m high.
Insert 2: Rectangle grid layout of shelterbelts. Spacing of the rows is denser against the prevailing wind.

Technical knowledge required for field staff / advisors: moderate

Technical knowledge required for land users: low

Main technical functions: increase / maintain water stored in soil, reduction in wind speed, protection from wind erosion, protection from sand encroachment, protection of crops from mechanical damage, reduction in evaporation loss

Secondary technical functions: increase in organic matter

Aligned: -against wind
Vegetative material: T : trees / shrubs

Trees/ shrubs species: Poplars (Populus spp.), willows (Salix spp.), increasingly also pine (Pinus sylvestris var. Mongolic

4.3 有关投入和成本计算的一般信息

具体说明成本和投入是如何计算的:
  • 每个技术区域
注明尺寸和面积单位:

ha

具体说明成本计算所用货币:
  • 美元
注明雇用劳工的每日平均工资成本:

1.20

4.4 技术建立活动

活动 措施类型 时间
1. 1 Planning / designing of shelterbelt. 植物性的
2. 2 Selection and collection of trees seedlings. 植物性的
3. 3 Clearing and preparing land for planting of shelterbelt in 植物性的 late autumn and spring
4. 3 Clearing and preparing land for planting of shelterbelt in 植物性的
5. 4 Pits for planting the seedlings are dug 植物性的 4 Pits for planting the seedlings are dug
6. 5 Tree seedlings are planted 植物性的 late spring
7. 6 After planting each seedling is watered for up to two years. 植物性的

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 Mainly collection and planting ha 79.0 1.2 94.8
设备 tools ha 1.0 5.0 5.0 100.0
植物材料 tree seedlings ha 1.0 25.0 25.0
技术建立所需总成本 124.8
如果土地使用者负担的费用少于100%,请注明由谁负担其余费用:

USA and domestic projects

注释:

Duration of establishment phase: 36 month(s)

4.6 维护/经常性活动

活动 措施类型 时间/频率
1. Watering 植物性的 after planting /timely
2. Pruning of trees. 植物性的
3. Pest and disease control within shelterbelt. 植物性的
4. Intermediate/ selective tree felling. 植物性的

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 Watering and Pruning ha 7.0 1.2 8.4 100.0
植物材料 tree seedling ha 1.0 3.0 3.0 100.0
技术维护所需总成本 11.4
注释:

The costs are calculated according to current standards/costs. The original planting is paid for by the state: replanting
and maintenance are the responsibility of the land user. If pines are the species of choice for re-planting, the cost
is considerably more than that shown above (which relates to poplar and willow).
Assuming: shelterbelts of 600 m by 400 m; each strip has 5 lines of trees (3 m apart), 2 m between trees within lines: resulting in 104 trees/ha, including the cropland between the strips (density within strips is 1666 trees/ha). Labour for establishment (104 trees): Land preparation, planting 10 days and 15 days for watering, weeding, etc (for first 3 years).

4.8 影响成本的最重要因素

描述影响成本的最决定性因素:

The most important factors to affect the costs are seedlings (No.) and machine.

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
指定年平均降雨量(若已知),单位为mm:

430.00

农业气候带
  • 半干旱

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.
说明该技术是否专门应用于:
  • 不相关

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)
表土有机质:
  • 中(1-3%)
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 fertility: low -medium

Soil drainage / infiltration: good

Soil water storage capacity: medium

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:
  • 混合(生计/商业
非农收入:
  • 收入的10-50%
相对财富水平:
  • 平均水平
机械化水平:
  • 机械化/电动
说明土地使用者的其他有关特征:

Population density: 10-50 persons/km2

Annual population growth: 1% - 2%

80% of the land users are average wealthy and own 35% of the land.

Off-farm income specification: farmers benefit from the shelterbelts as a source of off-farm income, through fodder, timber and firewood

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

  • communal/state
  • individual (see Annex T3 for remark)
  • individual (see Annex T3 for remark)

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

作物生产

降低
增加

木材生产

降低
增加

生产区域

降低
增加
注释/具体说明:

width of the shelterbelt

收入和成本

农业收入

降低
增加
其它社会经济效应

off-farm income

decreased
increased
注释/具体说明:

extra timber and firewood

Crop production

decreased
increased
注释/具体说明:

Trees in competition with crops for solar radiation, fertilizer, and water

社会文化影响

冲突缓解

恶化
改良

Loss of Food per agricultural land

increased
decreased
注释/具体说明:

shelterbelts of trees are not a direct source of food

生态影响

水循环/径流

地表径流

增加
降低
SLM之前的数量:

8

SLM之后的数量:

0

土壤

土壤水分

降低
增加

土壤覆盖层

减少
改良

土壤流失

增加
降低
SLM之前的数量:

4

SLM之后的数量:

2

减少气候和灾害风险

风速

增加
降低
其它生态影响

sand encroachment

improved
reduced

microclimate for crops

reduced
improved
注释/具体说明:

regulating temperature, increasing humidity

conservation/maintenance of soil fertility

reduced
improved

6.4 成本效益分析

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:

稍微积极

长期回报:

非常积极

6.5 技术采用

  • 单例/实验
如若可行,进行量化(住户数量和/或覆盖面积):

40 households in an area of 100-1000km^2 (10-50 persons/km^2)

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?:
  • 0-10%
注释:

100% of land user families have adopted the Technology with external material support

40 land user families have adopted the Technology with external material support

Comments on acceptance with external material support: estimates

Comments on spontaneous adoption: estimates

There is no trend towards spontaneous adoption of the Technology

Comments on adoption trend: The technology has not spontaneously spread beyond the areas developed through government intervention.

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
Reduced wind speed and trapped wind-blown sand particle

How can they be sustained / enhanced? Combine deciduous and evergreen trees to maintain shelterbelt’s protective function throughtout the year.
Increased crop yield

How can they be sustained / enhanced? Extend shelterbelt technology to unprotected croplands.
Increased cash income

How can they be sustained / enhanced? Improve rotational felling regimes that maximise quantity and quality of tree products (timber; fruit etc) without reducing the shelterbelt’s protective function. In Inner Mongolia apricot (Prunus armeniaca) and sea buckthorn (Hippophae rhamnoides) and in Gansu Province the Chinese dates (Ziziphus jujuba) are increasingly used.
Apart from their effect on the wind, the overall benefits of the shelterbelts - for timber, firewood, fruits and fodder for animals - outweigh the loss of cropland occupied by trees

How can they be sustained / enhanced? Experience over 40 years has demonstrated that narrower trees strips and smaller grid size (100 by 200 m) would increase ecological efficiency, but due to higher costs and potential competition with crops, the spacing of the shelterbelts has mostly remained as it was originally.
From 1960 onwards, approximately 22 million hectares – of vulnerable cropland have been protected in eastern Inner Mongolia

Editors’ comments: In China, a total of 1.84 million km2 suffer from desertification related to sand storms, shifting sands and wind erosion, making up 19% of the total land area. In those dry and desertified zones, farmland is barely productive, even with irrigation. The construction of shelterbelts in this northeastern part of China has had multiple benefits that outweigh the loss of cropland. However, maintenance has become an important issue with the changes in China’s land use laws. This is one of two examples of windbreaks amongst the case studies in this book. Remark: In the 1960s, all land ownership and land use rights in China were communal and cropland was farmed collectively by village communes. After reform and open policy was put into practice in 1978, land use rights were transferred to the villages, to groups and individuals. Land itself and the shelterbelts however still belonged to the state. Nowadays the rights to cultivate specific parcels of land, within protected blocks, are generally granted to individual farm households. In some cases, in recent years, the shelterbelts too have been redistributed to individuals to look after. Inevitably maintenance has become an issue. But most of the shelterbelts are managed well. 3.2.8: If farmer cuts mature timber (for example a 40 year-old poplar), he/she can sell it for US$ 20–25 per tree. With maturity of shelterbelts, the timber production increases, which brings increasing economic benefits; meanwhile, the effect of protection from wind erosion also improves.

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?
Loss of land due to area used for the shelterbelts In this wind-prone part of Inner Mongolia, overall gains from the protected zones compensate for the reduced area under crops, especially if economically valuable species are planted in the shelterbelt, such as Caragana korshinskii, which can be used as forage, for 'green fertilizer' through leaf mulch and for firewood.
Competition for sunshine, fertilizer and water Pruning of branches and digging of ditches to prevent roots penetrating the adjacent cropland
Farmers lost the right to crop the tree-occupied land (since the shelterbelts belonged to the state). Originally, farmers were not allowed to fell trees Nowadays the local forestry department permits farmers to occasionally cut trees, which is a source of income. If land users were allowed to cut trees on a more systematic basis, it would help them to better appreciate the benefits.
High cost (labour and money) for establishment Government support required.
Shelterbelts comprised of single tree species are less resistant to pests and diseases

Shelterbelts consume more water
Combine trees and shrubs/ different species, which improves both resistance and also the protective effect.

But they also help in drainage (where this is a problem) through lowering the ground water table and simultaneously reducing salinity. Appropriate tree species need to be selected and bred.

7. 参考和链接

7.2 参考可用出版物

标题、作者、年份、ISBN:

China atlas. China atlas publishing house, P 52.. 1999.

可以从哪里获得?成本如何?

library of Department of Resource and Environmental Science, BNU.

标题、作者、年份、ISBN:

Zhao Yu, Jing Zhengping, Shi Peijun, Hao Yunchong et al. Inner Mongolia soil erosion research remote sensing was used in Inner Mongolia soil erosion research, Science publishing house, P25.. 1989.

可以从哪里获得?成本如何?

library of Department of Resource and Environmental Science, BNU.

标题、作者、年份、ISBN:

Inner Mongolia forest department, Forest work manual,12, P33-34, P67.. 1998.

可以从哪里获得?成本如何?

library of Department of Resource and Environmental Science, BNU.

标题、作者、年份、ISBN:

Synthesized investigate team in Inner Mongolia-Ningxia, CAS. West of northeast Forest in Inner Mongolia autonomy region, Science publishing house, P82-101.. 1981.

可以从哪里获得?成本如何?

library of Department of Resource and Environmental Science, BNU.

标题、作者、年份、ISBN:

Sun Jinzhu. Natural condition and reconstruct in Hetao plain, Inner Mongolia people' s publishing house, P188-189.. 1976.

可以从哪里获得?成本如何?

library of Department of Resource and Environmental Science, BNU.

标题、作者、年份、ISBN:

Inner Mongolia forest Department. Inner Mongolia autonomy region forest statistic data,P75.. 1987.

可以从哪里获得?成本如何?

library of Department of Resource and Environmental Science, BNU.

标题、作者、年份、ISBN:

Hu Chun(chief editor). Inner Mongolia autonomy region climate resources about agriculture, forest and animal husbandry, Inner Mongolia people's publishing house, P45-47.. 1984.

可以从哪里获得?成本如何?

library of Department of Resource and Environmental Science, BNU.

标题、作者、年份、ISBN:

Water and soil conservation bureau, Yellow River irrigation works committee of Department of water and electricity. Water and soil conservation economy benefit thesis collecting, P45-47.. 1987.

可以从哪里获得?成本如何?

library of Department of Resource and Environmental Science, BNU.

标题、作者、年份、ISBN:

Zhang Pangchuen, A study on the benefit of shelter belt in the south part of Kerqin sand to agriculture increase in production. Journal of arid land resource and environment. Vol.4, no.1, P11-87.. 1990.

可以从哪里获得?成本如何?

library of Department of Resource and Environmental Science, BNU.

标题、作者、年份、ISBN:

Sun Jinzhu,Chen Shan(chief editor). Inner Mongolia environment alarm beforehand and repair countermeasure. Inner Mongolia people's publishing house, P132.. 1994.

可以从哪里获得?成本如何?

library of Department of Resource and Environmental Science, BNU.

标题、作者、年份、ISBN:

Compilation Committee of Inner Mongolia Forest Inner Mongolia Forest, Beijing: China Forestry Publishing House, 1989,299–319. 1989.

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