酸性土

In this study, 252 acidophilic actinomycetes were isolated from 10 acidic soil samples collected in Jiangxi Province, Yunnan Province and Beijing with dispersion and differential centrifugation approach.

实验中，从江西、云南、北京采集的10份酸性土样，采用分散和差速离心法和常规分离方法分离出嗜酸放线菌252株。

The result indicated that suitable thickness of paddy soil is about 15cm,and for dry arable land it should not be lower than 20cm;The alluvial rivers parent material is the best one to influent the output,the rice fields is the worst with the parent material of slate ground,while the dry and plough land is the worst for its purple sand shale parent material;The paddy rice is best with the acid soil,and the dry crop is the best with the neutral soil;The obstacles horizon exist in 35.2%of the rice fields in research region,and many for middle or top digit obstacles.

结果表明，水稻土的适宜耕层厚度为15 cm左右，旱耕地适宜耕层厚度应不低于20cm；成土母质对产量的影响以河湖沉积物母质最好，稻田以板页岩母质最差，旱耕地以紫色砂页岩母质最差；水稻以酸性土最好，旱作以中性土最好；研究区稻田有35.2%的存在障碍层，且多为中、高位障碍，是影响水稻产量整体提高的主要因素；水稻和旱作都以壤土为最好，其中，稻作怕砂，旱作怕粘；水稻土适宜的容重为1.00—1.29 g/cm~3。

Response surface analysis(central composite design of uniform precision) was applied to optimize the significant four factors[the ratio of bran and soybean meal,(NH4)2SO4, NaNO3 and KH2PO3] for culture medium of Aspergillus terreus by researching the contributiveness of factors and their interactions to the enzyme activity of acidic proteinase.

用响应面分析法（采用中心组合一致精度的设计）对影响土曲霉产酸性蛋白酶固态发酵培养基的4个主要影响因素（麸皮与豆粕比例、硫酸铵、硝酸钠、磷酸二氢钾）进行了优化，考察了各因素及其交互作用对酸性蛋白酶酶活的影响。

Novel exfoliated-type novolac/clay nanocomposites, as well as resol/clay nanocomposites were prepared by intercalative polymerization in the presence of H-MMT.

在酸性蒙脱土的存在下，以插层聚合方法制备了充分剥离型的热塑性酚醛树脂/蒙脱土纳米复合材料和热固性酚醛树脂/蒙脱土纳米复合材料。

In order to discover acid-tolerant Rhizobium meliloti that can nodulate alfalfa high-effectively on acidic soil, researches were explored to isolate rhizobia from alfalfa nodules on acidic soil (pH5.2), methods based on the thesis of adaptive acid-tolerance response of the Rhizobia were adopted, six strains were isolated, which could grow on solid medium with pH4.8 steadily. In addition, the nodulation characteristics, growth curves and mean generation time under different acidity of the strains were examined.

为获得能够使紫花苜蓿在酸性土壤中高效结瘤的耐酸根瘤菌，该研究从酸性土（pH5.2）上生长的紫花苜蓿根瘤中分离到若干菌株，利用根瘤菌对酸的适应性耐受反应筛选到六株能够在pH4.8的固体培养基上稳定生长的菌株，并检测了这六株菌的结瘤特征、不同酸度下的生长曲线和平均代时。

The process of the nonexchangeable potassium release from the soil tested in 912 hours can be well described with linear equation.④ The constant B rate of the nonexchangeable potassium release from the soil tested is controlled by the content of clay and slowly available K.

关于非交换钾的释放动力学，Martin等已用几种微酸性砂质土和砂壤质土进行了初步研究［7～10］，国内在此领域研究不多，对中国北方广泛分布的黄土性土壤非交换钾释放动力学研究更少。

6Moreover measures to control acid rain by liming in polluted area to neutralize resulted in reducing averagely 0.13 pH of soil, and the element content in soil had been improved gradually. The number of microbes had been increased in the No.2, No.3 and No.4 plots in polluted area. The quantity of bacteria had sored to 8.0×109per kilogram soil and N2-fixing bacteria also get 2.5×107per kilogram soil in Spring.

其中最理想的施石灰量为20-30Kg／100m~2，施石灰可中和土壤酸性，pH平均升高0.13，使土壤有机质、有效P、K等增加，并使林下土壤微生物数量增多；在春季，细菌数量达到8.0×10~9个／Kg干土，固氮菌达2.5×10~7个／Kg干土，从而促进了林分生长。

With use of acid-forming ammonium fertilizers, this tends to cause a shallow, acid layer at the soil surface after some years.

随着生理酸性铵态氮的使用，数年后便可能在土表形成一酸性薄层。

This indicates that these HA have similar compositions, but different structures and properties.Results from analysing E465/E665 are the same as those obtained by analysing molecule structure using colour index coefficientΔ~ K.Compassion study of HA in NaOH and NaHCO_3 solutions show that the absorption peaks shift towards the direction of longer wavelength.

这几个吸收带的变化证明了以紫色潮土HA、石灰性黄壤HA、中性紫色HA、酸性紫色HA、腐殖土HA为序的腐殖酸的芳构化度降低、缩合程度下降的观象，说明腐殖土HA其分子在苯环C骨架的聚合程度、芳构化度和分子复杂程度等上均最小，与紫外光谱分析结果一致。

In addition, field experiments were carried to examine influence on lucernes growth, yield and quality by applying calcium and inoculating acid-tolerant R.

并通过田间试验，检测施Ca~(2+)和接种耐酸苜蓿根瘤菌对酸性土上紫花苜蓿生长及产量和品质的影响，以期建立一套耐酸苜蓿根瘤菌筛选和鉴定体系，为在西南紫花苜蓿新种植区接种高效耐酸苜蓿根瘤菌奠定基础。

We have no common name for a mime of Sophron or Xenarchus and a Socratic Conversation; and we should still be without one even if the imitation in the two instances were in trimeters or elegiacs or some other kind of verse--though it is the way with people to tack on 'poet' to the name of a metre, and talk of elegiac-poets and epic-poets, thinking that they call them poets not by reason of the imitative nature of their work, but indiscriminately by reason of the metre they write in.

索夫农 、森那库斯和苏格拉底式的对话采用的模仿没有一个公共的名称；三音步诗、挽歌体或其他类型的诗的模仿也没有——人们把&诗人&这一名词和格律名称结合到一起，称之为挽歌体诗人或者史诗诗人，他们被称为诗人，似乎只是因为遵守格律写作，而非他们作品的模仿本质。

The relationship between communicative competence and grammar teaching should be that of the ends and the means.

交际能力和语法的关系应该是目标与途径的关系。