土壤覆盖

Soil and water conservation protective cultivation is an advanced cultivation technology that avoid cultivation or few cultivation on farmland and with stubble cover.Protective cultivation technology is an integration technology that use stubble cover,no-tillage cultivation,deep-plough with machine,and weeding with chemistry.Adopting soil and water conservation protective cultivation can reduce the loss of soil and water in northeast blackland area and improve the soil anti-erodibility.

中文摘要：水土保持保护性耕作是对农田实行免耕少耕，并用农作物秸秆残茬覆盖地表的一项先进耕作技术，保护性耕作技术是由秸秆覆盖、免耕播种、机械深松和化学除草等核心技术组成的一项集成技术，采用水土保持保护性耕作措施可以有效减少东北黑土区的水土流失，提高黑土区土壤抗蚀性。

Due to the complexity of the interaction between electromagnetic wave and the earth's surface, especially in the district covered vegetation, vegetation canopy disturbed strongly radar backscatter coefficient. So it is difficult to monitor soil moisture.

由于电磁波与地表相互作用的复杂性，特别在植被覆盖地表区域，雷达后向散射系数会受到植被覆盖层的强烈影响，这给监测土壤水分带来了极大的困难。

This showed that capacity of water-holding in biological soil crusts were obvious improve,and effected precipitation permeate or water second distribute process.The study results of"fertile islands"formation mechanism in biological crusts showed that biological crusts layer cover could increased nutrients content for below sand soil through precipitation permeate washing,and it promoted plants assimilate more nutriment.The matter import ways of biological soil crusts fertility island had many ways,including the effection of living macrobiotics metabolism in crusts levels,wind-sand flow of near surface,dust deposition and plants decomposition course,etc.Source of particle matter in biological soil crusts was wind-sand flow of near surface,and not dust deposition.Biological crusts layer cover had preserved effection for nature water content in 0-5cm soil layer,compared with the sand of no biological crusts layer,effecting precipitation permeate,and could not obvious restrained from the water evaporate process indoor experiment.

生物结皮层肥岛形成机制的研究结果表明：生物结皮层覆盖能够通过降水淋溶作用而增加下层土壤养分的含量，进而促进植物对养分的吸收；生物结皮层养分输入有结皮生物代谢、降尘、风沙流和植物分解矿化作用等多(来源：A73e3B3eC论文网www.abclunwen.com)种途径，但生物结皮层的颗粒物质来源主要是近地表风沙流，而不是大气降尘；生物结皮层覆盖对0-5cm土层自然含水量有一定的保护作用，并影响降水向深层渗透，不能有效的阻止表层水分的蒸发进程；研究表明采取人工促进技术能够在流动沙丘上形成生物结皮层，实现流动沙地的快速治理。

Current distributions in a cathodically protected crevice between a simulated coating and segmented mild steel electrodes were measured in diluted NaCl solutions. The effects of the control potential, solution conductivity and crevice thickness on the current distribution were studied.

1前言在联合采用绝缘覆盖层和阴极保护技术防止土壤或水中的钢结构，特别是地下油气管线外壁腐蚀的情况下，阴极保护能否完全防止剥离覆盖层下的缝隙腐蚀成为近些年来阴极保护领域的一个研究热点［'］。

There is a significant difference in daily change of soil moisture content at depth of 5 cm between the areas with and without microbiotic crusts.

结皮覆盖区与无结皮覆盖区土壤水分的日变化特征明显不同于距地表5cm处，而其他各土层的变化趋势则较为一致。

Based on experiment on mulching Olea europaea L.garden in dry and hot valley of Yunnan with different mulching materials, the dyanmic change of temperature, moisture and unit weight in the garden soil were detected and analyzed.

对云南省金沙江干热河谷永仁地区油橄榄园地进行覆盖试验，研究了不同材料覆盖后油橄榄园土壤温度、水分、容重变化。

This test mostly study the effects of black film mulching on soid most environmental factors and of black film mulching once fertilization on the growth of Platycodon grandiflorumA.

本文主要研究了黑色地膜覆盖对土壤主要环境因子的影响和黑色地膜覆盖一次性施肥对桔梗生长发育的影响。

Experiment was carried out in tobacco's field to compare effect of polythene mulch, straw mulch and straw manuring on soil moisture, flue-cured tobacco growth and leaf quality.

在大田条件下研究了地膜覆盖、秸秆覆盖和秸秆还田对烤烟生长发育、土壤相对含水率、烟叶产质量的影响。

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

潮湿的土壤比松散的土壤更能汲取热量，干燥的土壤用更多的护根或植物覆盖。

Gravel mulch could prevent soil from eroding by water,cut off soil capillary action, and it have an influence on infiltration and evaporation.

砂砾覆盖能防止土壤表面受到雨滴侵蚀，切断土壤的毛细管的作用，从而对土壤入渗和蒸发规律产生影响。

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。