The previous researches on purple soils neglected the properties of rock fragments, the distributions of rock fragments, and the influence on soil physical and chemical properties.
以往对紫色土的各种研究都忽略土壤砾石的性质和空间分布，以及对土壤物理和化学性质的影响。
The results show that the soils have, in varying degree inherited some properties of purple sedimentary rocks for their very weak chemical weathering.
结果显示，紫色沉积岩发育的土壤，在一定程度上继承了母岩的特点，化学风化作用微弱。
The basic properties of some expansive soils such as composition, physic-chemical properties and microstructure etc. are studied in this paper.
本文就笔者搜集到的几种不同的膨胀土样进行了基本特性研究，如物质组成、物理化学性质、微观结构等。
So, study the physical and chemical properties of degraded wetland soils help to investigate the cause of wetland degraded and provide theoretical basis for wetlands ecosystem protecting.
因此研究退化湿地土壤的理化性质，不仅有助于我们了解毛乌素沙区湿地退化的原因，还为进一步保护湿地生态系统提供了理论依据。
Field experiments were carried out on Loess Plateau to investigate the effects of cropping on the physical and chemical properties, phosphatase activity, and N2O emission of upland soils.
通过大田试验研究了黄土地区种植作物对旱作农田土壤理化性状、磷酸酶活性以及土壤n2o排放的影响。
The chemical behavior and bioavailability of selenium depend on its speciation in soil. The species of selenium in soils are controlled by physicochemical properties and other factors in soils.
硒在土壤中的化学行为和生物可利用性取决于它在土壤中的形态，而硒形态又受到土壤理化性质和其他因素的制约。
The chemical behavior and bioavailability of selenium depend on its speciation in soil. The species of selenium in soils are controlled by physicochemical properties and other factors in soils.
硒在土壤中的化学行为和生物可利用性取决于它在土壤中的形态，而硒形态又受到土壤理化性质和其他因素的制约。
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