soil phase

It is indicated that there are many and complex species of phytoplankton, zooplankton and benthon in the culture water with 1 cm bottom soil from shrimp pond. The phytoplankton growth phase is properly regulated with photosynthetic bacteria and illumination.

发现采用对虾养殖池水与加铺1cm厚对虾池底泥的培育水中有种类繁多，生物量丰富的浮游植物、浮游动物、底栖生物。

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The phase change phenomena of frozen soil were simulated based on Characteristics of Heaviside staircase function and Gaussian jump function, and convergence and stability were improved.

利用Heaviside函数的阶梯性及Gaussian函数的突变性模拟了冻土相变过程能量的突变，提高了数值求解收敛的速度和稳定性。

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In the initial phase of infiltration, the soil structure of A-1 soil genetic horizon was the major influencing factor;

在初渗阶段，入渗率主要受A1层土壤结构影响；

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The experimental results showed that the bonding performance of the soil binder was related to its gel SiO_2 content and structure of the noncrystalline phase.

结果表明：土壤粘合剂粘结性能与SiO2溶胶数量及结构性能有关。

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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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The air permeation velocity and pressure gradient curve in the soil show clearly in step-phase.

气体渗透速度与外界所施加的“压力平方差梯度”之间存在明显的分段特征.

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