Changes of topsoil bulk density and saturated hydraulic conductivity under infiltration condition of water storage pit
蓄水坑入渗表层土壤体积质量和饱和导水率的变化
Under certain soil texture, bulk density and water content of soil, moving time and distance of soil solute were regarded as the main parameters on soil solute transport.
在土壤质地、土壤容重和含水量一定的情况下 ,把土壤溶质运移时间和运移距离看作影响土壤溶质运移的主要参数 ,建立2个输入单元和 1个输出单元的三层BP网络 ,对一维垂直土柱Cd2 + 的穿透试验进行了模拟和预测。
Nutrient migration and soil salinisation are the two major concerns in the research of soil solute transport.
土壤养分运移和土壤次生盐碱化都是土壤溶质运移领域研究的主要内容，而且土壤养分运移研究起源于土壤水盐运动的研究理论。
Based on the review of national and international research results of soil solute transport and saline water use, both theoretical analysis and laboratory experiments were conducted to study infiltration of water and solute transport in layered soils, automatic measurement of soil water and solute transport parameters , and safe use of slightly saline water.
本文在结合国内外土壤溶质运移理论与微咸水利用试验研究成果的基础上,采取了理论分析与室内试验结合的方法,对层状土水分入渗和溶质运移特征、自动测定土壤水分、溶质运移参数的方法和微咸水安全利用进行了研究,取得了如下结论:1。
Spatial Heterogeneity of Surface Soil Bulk Density in Coastal Region of North Jiangsu Province
苏北海涂围垦区表层土壤体积质量的空间异质性研究
Changes of topsoil bulk density and saturated hydraulic conductivity under infiltration condition of water storage pit
蓄水坑入渗表层土壤体积质量和饱和导水率的变化
Water content at field capacity is usually expressed as a percentage of the weight or volume of oven-dry soil.
土壤含水量一般用干土壤的重量或体积百分比来表示，它受土壤质地的影响。
soil quality-determination of soil water content calculated on a volume basis(gravimetric method)
土质-以体积为标准的土壤水含量的测定-重量分析法
Effects of Nitrogen Application on Dry Matter Accumulation,Nitrogen Uptake,Yield,and Quality of Flue-cured Tobacco in Low Fertilility Soil
低肥力土壤施氮对烤烟干物质积累、氮素吸收及产质量的影响
The Construction Quality Control of the Mass Ready Mix Concrete Transmitted by Pumps;
泵送预拌大体积混凝土工程质量控制
Quality control of mass concrete in municipal bridge engineering
市政桥梁工程大体积混凝土质量控制
Construction technology of large bulk of concrete and its quality control
大体积混凝土的施工技术及质量控制
Study on the Quality Assurance and Control System of Farm Field Soil Environment;
农田土壤环境质量监测中的质量保证和质量控制体系研究
The Utilization of Microorganism to Improve the Soil Fertility;
利用土壤微生物改善土壤质量的研究
The Influence of Soil Algae on Index of Soil Quality;
土壤藻类对土壤质量指标影响的研究
Environmental quality standard for soils
GB15618-1995土壤环境质量标准
Study on the Effects of Alfalfa Yield to Soil Water Content and Mineral N in Profiles of Alfalfa Grassland;
紫花苜蓿地上生物量累积对土壤水分及矿质氮变化的影响研究
Impact on Quality of the Water Spinach and Heavy Metal Accumulation of Soil of Different Applying Sewage Sludge Amount;
污泥用量对土壤重金属积累及空心菜品质的影响
Effects of different cropping systems on soil inorganic nitrogen accumulation--A case study in Tongzhou District,Beijing
不同种植模式对土壤矿质氮累积量的影响——以北京通州区为例
Effects of Different Soil Water Conditions and Phosphorus Application on Dry Matter Accumulation and Water Consumption of Wheat
不同土壤水分条件下施磷量对小麦干物质积累及耗水规律的影响
Effect of Nitrogen Applied Levels on the Dynamics of Biomass, Nitrogen Accumulation of Cotton Plant on Different Soil Textures
氮肥对不同质地土壤棉花生物量与氮素积累的影响
On Data Quality Assurance System in National Survey of Soil Erosion with RS and GIS
全国土壤侵蚀遥感调查数据质量保证体系