查询词典 water conservation

As a result silver chai n forest land has a better capacity in soil and water conservation than naked l and. It can reduce surface runoff than naked land when rainfall changes around 3 0mm. In 2000, 179.42 g/m~2 soil were lossed in silver chain forest land, 980.1 g/m~2 in naked land on the contrary.

结果表明，与裸地相比刺槐林有很好的水土保持作用，能明显地减少地表径流和泥沙侵蚀。3 0 mm左右降雨量，有林地减少地表径流的能力是无林地的 3倍以上。2 0 0 0年径流观测场有林地土壤流失量为 179.4 2 g/ m2 ，无林地土壤流失量为

The water conservation benefit of soil for different forests was 277.28%-173.67% higher than that of grass slope, among them, the highest one was birch and larch mixed forest, the followings were larch planted forest, Chinese pine planted forest, birch natural forest, and the lowest one was natural shrub forest.

林地土壤的涵养水源效益比荒草坡高277.28%~173.67%，其中白桦落叶松混交林最高，落叶松人工林、油松人工林、白桦天然林次之，灌木林最低。

A field experiment of 40 cm subsoiling under no-tillage 2 years later was operated from 2005 to 2006. Based on the data of soil moisture and crop yield, the physical basis of subsoiling for water conservation and yield increasing was analyzed.

土壤免耕第3年的基础上深松40cm，2005~2006年连续两年通过田间试验观测深松对土壤水分的影响，分析深松保墒增产的机理。

Field trials on the effects of the convertional tillage, no-tillage and subsoiling methods, 4 residue coverages (0, 25 yc, 50%, 75 %) and tractor wheel compaction on water conservation are conducted for wheat crop yield by using rainfall simulation.

在模拟降雨条件下研究小麦地的传统、免耕和深松3种耕作措施和0，25％，50％和75％4种覆盖度以及拖拉机轮胎压实与非压实对土壤水分保护效果的影响。

The Luo river bright ocean labor trade limited company supplies the product in kind quality is fine, widely applies in the water conservation, the electric power, the bridge and the city high-rise construction and so on the important project and the country, the place key production enterprise.

洛阳明洋工贸有限公司所供应的产品实物质量优良，广泛应用于水利、电力、桥梁和城市高层建筑等重要工程和国家、地方重点生产企业。

Vegetation construction of forests and grass for soil and water conservation is a process of natural formation of plant community and natural ecological restoration with the participation of humans.

林草植被建设是人工参与下的植物群落自然形成和生态自然修复过程。

Soil and water conservation ; farmer households' behavior ; farmer households' off-farm work ; resources use ; Logistic model

水土保持；农户行为；农户兼业；资源利用； Logistic模型

Firstly, according to study dynamic changes of the elements structures in succession about natural and artificial forest, then summarized regular patterns;at the same time.based on the study of Coupling Relationship between structure and function of water conservation forest established the ideal structures from the stand level and the watershed level. The ideal structures from the stand level: uneven-aged, double layer and mixed structure, and trend to natural forest. The watershed level followed the same principle, that is double layer patches, uneven-aged forest well-distributed and to build up different forest patches in watershed.

首先，经过对北京山区水源林天然林和人工林结构要素的演替动态研究，提出其发展规律，同时依据水源林结构与功能耦合关系研究，从林分层次和流域层次上分别构建了水源林的理想结构，其中，林分层次上水源林的理想结构为：异龄、复层、混交的结构状态，林分结构趋于天然林结构的特征；在流域层次上水源林的理想结构为也应形成&复层&、&异龄&、&混交&的结构，即：在流域各水源林斑块间形成林冠层复层、斑块内部乔木、灌木、草本层的复层；不同水源林年龄面积上的均匀分布；形成不同水源林斑块间的镶嵌分布。

The mainly study results as follows:(1) The study focused on the characteristics of whole distribution and typical structures of water conservation forest in moutain areas of Beijing. According to analized the structure of 18 typical forest stands, including the species structure, horizontal structure, vertical structure, quantitative indicators and standards.Conclusion that: uneven-aged, double layer and mixed structure were .

通过对北京山区水源林18种典型森林类型林分结构归纳总结，从林分物种结构、水平结构(混交度、年龄、郁闭度、大小比数)、垂直结构、生物量、土壤厚度等方面，提出北京山区典型森林类型的结构特征，并定量化表达，从而总结出北京山区水源林结构的关键要素是：异龄、复层和混交。

Drainage ditch built with biological bricks is a new type of biological measure for soil and water conservation works.

生物砖排水沟是一项新型水土保持工程型生物措施。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。