根据土壤退化的某些微形态诊断特征，将紫色土退化问题归纳为土壤物理性退化、土壤构造性退化和土壤营养性退化等类；
The degradation of purple soils is able to classified into physical, constitutional and ndtriental degradation according to some micro- morphological features.
另一项最新研究发现，单独一次耕作不会对通常不耕作的土地产量或土壤结构造成破坏。
Another recent study found that a single tillage does not harm yield or soil structure in land that is normally not tilled.
用中子活化分析测定土壤中的铀以圈定构造。
Neutron activation analysis for uranium in soild may delineate structures.
湖北省碘缺乏病的流行分布与地势、地貌、土壤、地层岩性、饮水中的碘含量以及构造带密切相关。
The endemic distribution of IDD in Hubei province is closely related to topography, soil, land features, stratum- lithology, iodine content in drinking water and tectonic zones.
深部土壤样品元素含量分布与隐伏构造之间有较高的空间对应关系。
Deep soil samples element content distribution and concealed structures have higher space between the corresponding relation.
分析测定土壤中的铀以圈定构造。
Neutron activation analysis for uranium in soild may delineate structures.
研究吉林玉米带现行耕作制度下所形成的剖面构造特征对土壤物理特性的影响。
The research aimed to study the effects of the profile conformation characteristics of Jilin corn belt under current farming system on the physical characteristics of soil.
构造模型进行预测的关键在于确定模型参数，在土壤溶质运移模型中一般包括弥散系数和延迟因子两个参数。
The key to establish model and predict lies in the determination of model parameters, which include generally dispersion coefficient and retardation factor.
而物理性状（除土壤板结外）基本是良好的土壤物理构造。
The physical structure of the soil basically showed favourable characteristics except for hardening.
在充分考虑草地土壤水分亏缺和生产力水平的基础上，构造了草地缺水指数和旱灾评判系数。
Based on the consideration of grassland water shortage and productivity, water shortage index and drought judgment index were presented.
“平面型”犁底层剖面构造有利于改善土壤结构。
The plow pan profile constitution of the flat type helps to improve soil structure.
最后，根据冬小麦的需水规律和土壤有效水含量构造干旱指数模型。
At last, a drought index model was developed by considering the water requirement of winter wheat and the available soil water content.
最后，根据冬小麦的需水规律和土壤有效水含量构造干旱指数模型。
At last, a drought index model was developed by considering the water requirement of winter wheat and the available soil water content.
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