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）

Best Practices for Land Degradation Control in Dryland Areas of China (Best Practices China)

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？:

06/09/2007

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

2.1 技术简介

技术定义:

By established facilities and use organic matter of animal manure, human waste, plant straw for anaerobic fermentation to produce inflammable biogas for uses of lighting, cooking with the residue liquid and dreg for high quality organic fertilizer.

2.2 技术的详细说明

说明:

The demonstration site is located at Jingyuan County of central Gansu Province, an arid county with annual rainfall of 240 mm for rainfed agriculture. The vegetation cover of the county is 5.6% and the water and soil erosion affected area is 5359 square kilometers or 92.2% of the total land area. The fragile ecologie and serious land degradation made the locality a very poor place, short of fuel. Poverty and ecological degradation has formed a vicious circle. Energy scarcity problem that needs to be solved urgently is also a cutting point for curbing land degradation.

Since 2000, with the support of relevant departments, the biogas production technology has been introduced and extended in Jingyuan County. Due to its multiple functions in the kitchen, toilets, animal houses etc., it has obvious social, ecological and economic benefits. The technology is easy and the maintenance is simple, so the extension is quick.

The construction procedures include: location identification, digester type selection (e.g. rotational-flowed digester), determination of elevation, earthwork, and construction of digester base, digester wall, feed and discharge chutes, proof seal layer and digester cover etc..
Biogas digester operation preparation: inoculum input, raw material pretreatment and ratio, prohibition of input materials (poisonous farm chemicals, oil dregs, bones or bone powder etc).
The operational management: pH value must be kept at 6.8-7.5 and digester fermentation temperature maintained over 10 degrees Celsius; Replace desulfurizer every three months, stir frequently to ferment raw material, inspect often to ensure no leakage in the cover, pipeline etc.; frequent work in feeding and discharging, control the density of liquid material.

(1) Ecologically, the use of biogas can reduce vegetation damage and prevent land degradation. A biogas digester with a capacity of 10 m3 can economize 2 tons of firewood every year, which is equivalent to the annual increment of 3.5 mu firewood forest; The dregs and residue liquid are organic fertilizers, the liquid can also be used for the treatment of plant diseases and pests;
(2) Social benefits: The biogas digester may offer over 70% clean energy for the household while reducing the consumption of the conventional energies of firewood and coal; The life quality, sanitary condition are improved and the workload of women is decreased; The use of biogas digester promotes social progress by raising the awareness of science and technology of the farmers to promote the construction of new socialist countryside.
(3) Economically the biogas will increase the income of farmers. It can cut down the expenditure by 1500 Yuan for one year. Biogas use can promote livestock development and as an environmental-friendly agriculture development model.

2.5 已应用该技术的、本评估所涵盖的国家/地区/地点

3.1 该技术的主要目的

• 创造有益的经济影响
• 创造有益的社会影响

3.2 应用该技术的当前土地利用类型

注释:

Major land use problems (compiler’s opinion): low vegetation cover, wind erosion, water erosion, barren soil, arid climate, fragile ecological condition.

3.3 有关土地利用的更多信息

每年的生长季节数:

• 1

具体说明:

Longest growing period in days: 180, Longest growing period from month to month: April to September

3.4 该技术所属的SLM组

• 节能技术

3.5 技术传播

注释:

Total area covered by the SLM Technology is 5809.4 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

4.2 技术规范/技术图纸说明

Main technical functions: Protect vegetation, reduce water erosion, prevent wind erosions

4.4 技术建立活动

	活动	措施类型	时间
1.	Materials, cement, sand, cooker
2.	Labour 7.5 person days
3.	Other: Transport fee

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	person days	7.5	5.333	40.0	100.0
施工材料	Cemet, sand, cooker		1.0	267.0	267.0
其它	transport fee		1.0	40.0	40.0	100.0
技术建立所需总成本					347.0

5.1 气候

5.2 地形

5.3 土壤

5.6 应用该技术的土地使用者的特征

5.8 土地所有权、土地使用权和水使用权

• collectives

土地使用权:

• 个人

6.1 该技术的现场影响

社会经济效应

收入和成本

社会文化影响

生态影响

水循环/径流

土壤

生物多样性:植被、动物

减少气候和灾害风险

其它生态影响

6.2 该技术的场外影响已经显现

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）？

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）？

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
Protect vegetation
Prevent soil and water erosion
Economical use of energy
Serve the development of organic agriculture

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？
high initial investment	get more project support
low gas production	strengthen training for correct operation
biogas can be dangerous	strengthen training

7.1 信息的方法/来源