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Growth and Metal Uptake Dynamics of Two Elsholtzia Plants on Cu,Pb and Zn Mixed-Contaminated Soils

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Some soil chemical properties, as pH of soils, cation exchange capacity, calcium carbonate, ferriferous oxide and organic matter are studied. Chromium speciation is mainly affected by soil pH, CEC and calcium carbonate, but little by ferriferous oxide and organic matter.

所研究的土壤化学性质中，土壤pH值、阳离子交换量以及碳酸盐量对土壤铬形态分布及生物有效性影响较大，铁氧化物与有机质含量对土壤铬形态的分布及生物有效性有一定的影响。

In this paper, the marine soft soil is mixed with 10% cement added with 0.5% NaOH and 0.5% Na2CO3 separately, which form two types of new cement-soils. Comparing with the undisturbed soil and the 20% cement-soil results in that the alkalescence additive can contribute to generate a large number of needle-like, rod-like or fibriform hydrate calcium silicate crystals. The hydrate calcium silicate crystals can inhibit the generation of calcic alum crystal which would bring expansive action. At the mean time, it can separate out hydrate calcium. The hydrate calcium silicate crystals and hydrate calcium constitute the filling and inclusions together among soil particles and on the surface of soil particles, which cut down the interstices of cement soil obviously. Therefore, the soil mass can be reinforced and the intensity can be improved.

现场试验中将海积软土与分别掺入0.5%NaOH和0.5%Na2CO3的10%水泥就地搅拌，形成两种新型水泥土，在与原状土及20%纯水泥土进行比较后，发现碱性外掺剂可以促使生成大量针状、棒状或纤维状水化硅酸钙晶体，抑制了能产生膨胀作用的钙矾石的生成，同时，有Ca2晶体析出，它们共同构成土颗粒间和土颗粒表面的充填物和包裹物，使水泥固化土的孔隙明显减小，密度和强度得到极大提高。

Bacterivorous and fungivorous nematodes were dominant groups in soils, low and medium in As level, respectively, whereas, plant-parasites were the predominant group in soil, high in As level.

食细菌和食真菌线虫分别为低As和中As土壤的优势营养类群，而植物寄生线虫为高As土壤的优势营养类群。

Scientific classification of soils is the basis of utilization and exploitation of soil resources. However, Soil Taxology, characterized by quantification, standardization and internationalization, is not popularized by far. So it is necessary to study its relationship with soil genesic classification and its application for agriculture and environment.

土壤的科学分类是土壤资源开发和利用的基础，土壤的系统分类以定量化、标准化和国际化为特点，但其大众化水平有待进一步提高，尚需加强与土壤发生分类的参比研究，并深化其在农业生产应用、土壤环境评价等方面的实践意义。

The change of pH value of soils: The pH value decreased of after plantation of Gleditsia japonica Miq.

土壤pH值的变化：栽种山皂荚和梓树两种植物后，根际土壤pH值较非根际土壤pH值有所下降。

The results show that the compressibility of cohesive soils is closely related to the grain morphology, granulometric distribution, grain packing and pore distribution.

研究表明：粘性土的压缩性与颗粒的形态、分布及排列、孔隙的分布情况密切相关；一般来说，颗粒的分布分维、定向度、圆度越小，土体的压缩性就越低，抗压性能就越好。

Van Cleemput O%Vermoesen A%De Groot C J Emission of N2O out of different soils,cropping systems 沈阳, 1995,null

史奕%徐星凯%周礼恺抑制剂及其组合对15N在小麦-土壤系统中的行为和归宿的影响应用生态学报， 1998，2

The recent discovery of the halophytic plant species,Thellungiella halophila,which is native to the seashore saline soils,meets all the criteria for being a genetic model system.

而最近的研究发现，盐生植物—盐芥是研究植物耐盐机制最合适的植物。

The transport of humic acid in different soils at various conditions was studied.

：研究了不同条件下胡敏酸在土壤中的迁移过程。

I didn't watch TV last night, because it .

昨晚我没有看电视，因为电视机坏了。

Since this year, in a lot of villages of Beijing, TV of elevator liquid crystal was removed.

今年以来，在北京的很多小区里，电梯液晶电视被撤了下来。