soil density

An optimum planting density must be employed to get a high yield, depending upon soil condition, varietal tillering ability, fertilizer level, number of plants per hill, and planting season.

获得高产必须采用最适植株密度，视土壤条件、品种分蘖力、肥力水平、每蔸苗数和播种季节而定。

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The annual plants dominated the species and soil seed density during sand dune succession process.

土壤种子库物种组成和种子密度均以一年生植物为主.

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Second, according to the parameters based on the common tri-axial compression and lateral confinement compression test on the undisturbed soil sample, this paper calculate the soil stress between piles and dry density on the use of FORTRAN program, thus make some important conclusions.

其次，采用原状土样进行室内常规三轴试验及侧限压缩试验，确定试验参数，代入前述理论公式，借助FORTRAN语言计算桩间土土体应力及其干密度，得出了一些结论；

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The quantitative relationship between planting density and soil water supply and water consumption is derived consequently.

本文通过对不同密度林地根层土壤水分补给和消耗量的分析,提出确定土壤水分植被承载力的概念模型.

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Natural factors include climate, vegetation, edaphic factors, terrain, geological and hydrological factors. However, the main factors include rainfall, the degree of vegetation coverage, the soil texture, the terrain gradient and the ditch density geological lithology.

其中自然因素包括气候因素、植被因素、土壤因素、地形地貌因素、地质因素及水文因素，但起主导作用的是降水、植被覆盖度、土壤质地、地质岩性、地形坡度和沟谷密度等；

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Rainfall makes the soil density and disperse coefficient increased and porosity decreased.

降雨能使火烧迹地的土壤密度和分散系数升高、孔隙度下降。

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Controlling livestock grazing density and implementing environmental restoration are important measures for soil andconservation in Iceland.

控制放牧密度和开展环境修复是冰岛最主要的水土保持措施.

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A study on optimum density of soil and water conservation Black Locust Forest in Taihang Mountain

太行山刺槐水土保持林的适宜密度研究

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But in actual application it is affected by many surface factors, such assoil uniformity, soil density, soil moisture, covering layer and the terrain.

但现场伽马能谱在实际的应用中有很多地表因素影响其准确性，例如土壤均一性、密度、湿度、覆盖层、地形等因素。

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Measurement of soil density and water content with Cs-137 gamma ray attenuation

用铯-137γ射线衰减法测量土壤密度和含水量

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Along with the increment of discharge voltage, the electron temperature and electron number density of soil plasma increase as well.

电子温度和电子数密度随着放电电压的增大而增大。

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then the years of soil loss by erosion is calculated by soil erosion modulus, soil horizon thickness and soil density. according to the standard of ministry of water resources, the potential danger of soil erosion can be divided into 5 grades.

然后，由土壤年均侵蚀量、土层厚度和土壤容重得到土壤抗蚀年限图，按水利部标准将土壤侵蚀潜在危险度分为5级。

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Results showed that 61 groups of soil fauna, average density was 2238.95 ind/ m2, were obtained during two years.

研究结果显示，研究期内共获得土壤动物61类，平均密度为2238.95个/m2。

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There is a lot of rain between June and July, so soil moisture fluctuation frequently. Step into September to the corn harvest period, soil moisture is in smooth gradual cut phase. Planting density has a certain influence on distribution of soil water storage area.

6-7月份降水量集中，土壤含水量波动频繁，进入9月份以后到玉米收获期间，田间土壤含水量变化呈逐渐平稳消减阶段；种植密度对土壤储水区的分布有一定影响。

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