土壤覆盖

The results showed that the soil water contents of sand, A. ordosica and C. korshinskii vegetation in lysimeters all increase due to bitumen felt cover, especially of the CK. The canopy, new branch length and leaf area index also grow in experimental period. But the CK consumes a little water because the neutron probecan t detect the water in gravel layer.

结果表明蒸渗池表面自油毡覆盖至试验结束，油蒿、柠条和流沙处理0～150cm土层土壤含水量都增加，尤其流沙处理土壤含水量上升最明显；油蒿与柠条的冠幅、新梢长和叶面积指数均增加；由于中子仪探测不到蒸渗池底部40cm厚的砾石层的水分，导致了对照流沙处理测定结果不合常规。

The study was conducted in the field to have a survey of the degradation of films and examine the effect of degradable films on crop by comparing it with the uncovered plots and polyethylene films. And the laboratory experiment on the effect of different soil moistures (air-dried, 0.10 g/g, 0.15 g/g, 0.20 g/g, 0.25 g/g, 0.30 g/g) and temperatures (5℃、 15℃、 25℃、 35℃、 45℃) on degradable ratio and content of films was studied. The conclusions were as follows:(1)The film can be degradable at every treatment but its degradation was best when the temperature and water content in soil was 35℃ and

本试验统计观察了降解膜的田间降解状况，比较了它与裸地、普通膜对作物的覆盖效果，在室内研究了在不同土壤水分(风干土、0.10g/g、0.15g/g、0.20g/g、0.25g/g、0.30g/g)和温度(5℃、15℃、25℃、35℃、45℃)下，膜降解率、土壤微生物量碳等的变化情况，获得的主要结论如下：(1)地膜在各处理下都发生降解，但温度为35℃和水分为0.25g/g时地膜降解最快，程度最深。

It is advanced farming technology which through the implementation of reduced tillage, no-tillage technology, using crop stalks stubble ground cover to reduce soil water erosion, wind erosion, so as to enhance the capacity of soil fertility and drought-resistance .Function and role of conservation tillage technology have been proved by practice.

保护性耕作技术是相对于传统耕作的一种新型耕作技术，起源于19世纪末的美国，通过对农田实行少耕、免耕技术，尽可能用农作物秸秆、残茬覆盖地表，以减少土壤水蚀、风蚀，从而提高土壤肥力和抗旱能力的先进耕作技术。

Flow-field simulation shows that radial pressure gradient goes down fast and air flowrate is nearly directly proportional to the well vacuum and the soil permeability coefficient. It also indicates that stop-off coating will play an important role in SVE.

采用Galerkin三角形有限单元法对复合地表边界的竖井土壤气相抽提稳态流动问题进行了数值模拟分析，模拟结果显示：气相压力沿径向梯度迅速下降，抽提流量与土壤通透系数及真空度呈现高度相关的正比例关系，且地表隔绝覆盖层对流场影响很大。

Mulch is placed on top of soil to protect it. Mulch is generally used to a height of about ten centimeters.

地膜通常是覆盖在土壤表层保护土壤，通常要用大约10厘米的高度。

Moist soil observes absorbs more heat than lose loose , dry soil covered with moach mulch or vegetation.

潮湿的土壤比植被覆盖的干燥松散的土壤吸收更多的热量。

Moist soil absorbs more heat than loose, dry soil covered with mulch or vegetation.

潮湿的土壤比疏松，干旱，覆盖有保护物或草木的土壤更容易吸收热量。

Author puts forward the definition of rainfall infiltration and soil water redistribution with mulch, and describes its physical process, illuminate its mechanism.

提出了秸秆覆盖条件下降雨入渗和入渗后土壤水分再分布的定义，并对其物理过程进行了描述，阐明了降雨入渗和入渗后土壤水分再分布的机理。

If a test finds that soil has too much lead, you might be advised to remove the soil or cover it with sod grass.

如果测试发现土壤中含有过多的铅，建议移除土壤，或者用草皮覆盖。

If a test finds that soil has too much lead, you might be advised to remove the soil or cover it with sod grass.

如果检测出土壤中含有大量铅，建议把那些土壤移除，或者用草皮覆盖。

And Pharaoh spoke to Joseph, saying, Your father and your brothers have come to you.

47：5 法老对约瑟说，你父亲和你弟兄们到你这里来了。

Additionally, the approximate flattening of surface strip using lines linking midpoints on perpendicular lines between geodesic curves and the unconditional extreme value method are discussed.

提出了用测地线方程、曲面上两点间短程线来计算膜结构曲面测地线的方法，同时，采用测地线间垂线的中点连线和用无约束极值法进行空间条状曲面近似展开的分析。