The results indicated that on average the rank order of the concentrations of different nitrogen species in overlying water and porewater was organic nitrogen > ammonia > nitrate ; the main form of inorganic nitrogen in sediments was of ammonia , and the submerged plant cannot change this case 结果表明：总体上，上覆水和间隙水中不同形态氮含量的顺序为有机氮氨氮硝态氮；沉积物中可交换态无机氮以氨氮为主，沉水植物的存在并没有改变这一格局。
Shake - flask culture condition of lysine fermentation were studied with czl . appropriate feeding of organic niteogen sources was favorable for fermentation jn our experiment , the concentations of the yeast extract and beef extract were 15g / l and 25g / l . the initial ( nh02so4 and glucose concentrations suitable for fermentor production ranged form 55g / l and 150 - 180g / l respectively 通过摇瓶发酵实验初步确定czl的发酵条件为：初糖： 150 - 180g / l ，采用无机氮源和有机氮源配和使用，最佳组合是：硫酸铵质量浓度为55g / l ；酵母膏质量浓度为15g / l ，牛肉膏质量浓度为25g / l为最佳。
Effects of physical factors on the growth of strain ag were of light intensity , temperature , inoculum volume , initial ph , effects of nutrient factors on the growth of strain ag included organic carbon sources , organic nitrogen sources , growth factors , hormone etc . , and the correlation among nutrient factors being considered . the growth condition of single filament on the plate was also studied 主要内容包括物理因子如光强、温度、接种量和ph值等对螺旋藻生长的影响；化学因子包括有机碳源、有机氮源、生长因子、生长激素等对螺旋藻生长的影响及这些营养因子之间的综合作用，并解决了单藻落平板生长问题。
This paper synthetically summarized current research on terrestrial nitrogen cycle and soil nitrogen cycle , meanwhile , uncertainties of terrestrial nitrogen cycle were discussed . the global diversified ecosystem nitrogen and carbon storage was comparative thoroughly estimated through different life zone . the global organic nitrogen storage was estimate by the c / n ratio Post等按照不同生物带比较全面的估算了全球各种生态系统类型的土壤碳氮密度和含量， mcelroy等利用土壤有机碳储量和碳氮比来估算了全球土壤有机氮储量。
This course demonstrate the important sorts of wastewater analysis , it includes chemical oxygen demand ( cod ) , biochemical oxygen demand ( bod ) , suspended solids ( ss ) , volatile suspended solids ( vss ) , ammonia nitrogen , organic nitrogen , nitrite nitrogen , nitrate nitrogen , orthophosphate , total phosphate , sulfate , and sulfide 本课程包含污水分析重要项目的原理解说及实验分析，分析项目包括：化学需氧量、生化需氧量、悬浮固体物、挥发性悬浮固体物、氨氮、有机氮、亚硝酸盐氮、硝酸盐氮、正磷酸盐、总磷、硫酸盐及硫化物。
To meet the need of grain production , investigations such as property of nutrients uptake of high - yielding wheat , regularity of nutrient requirement of high - yielding maize , proper rate and ratio of npk fertilizers for high yields of wheat and maize , and rational rate and ratio of organic - n to inorganic - n in double cropping system have been conducted by shuming z . and yizhi l . et al . since 1980 为了满足粮食生产需要，自1980年以来，张漱茗和刘毅志等人就开始调查高产小麦养分吸收特性、高产玉米养分需求规律、高产小麦和玉米氮磷钾肥适宜用量和比例、一年两作制中有机氮和无机氮的合理用量和比例。
( 二 ) using simulative test and onthogonal test to analyze the theories of folded point reactions of chloroamine disinfectant water and the mixed reactions of conveying tubes water by different disinfectant technique . a ) when organic contaminations of original water reach some degree , the reactions of some organic nitrogenous and activated chlorine in original water and the transfoms between organic nitrogenous and ammonia - n will disturb the produce and stability of 1 - chlonoamino . the curve got by the sutra folded point chlorination theory will have greatly changes ( 2 )采用生产性实验，分析氯胺消毒水的折点反应理论及不同消毒方式的管网水的混合反应，实验室及生产实验表明： a )当原水有机污染达到一定程度，原水中部分有机氮与活性氯的反应以及有机氮与氨氮之间的转化将干扰一氯胺的生成及稳定，经典折点加氯理论曲线将发生较大变化。
The data needed by the research are collected from relevant materials and field sampling , including the soil saturation hydraulic conductivity , soil bulk density , various kinds of chemical parameters of soil layer ( such as organic nitrogen , organic phosphorus and soluble phosphorus ) , the transformation of organic carbon content of soil layer and the land use in 1993 etc . 笔者两次参加对研究区的实地考察，并进行相关数据的收集和实测，包括1993年土地利用、土壤饱和导水率、土壤容重和土壤各种化学参数(如有机氮、有机磷和可溶性磷等) ，以及后来所进行的土壤层有机碳含量的转化等。
With the increase of temperature and biomass , nh4 + and no3 - in the surface water were largely consumed and decreased as a result ; while organic n and particle p increased as the enhancement of suspending biological particles . no2 - in the surface water increased with temperature as nitrifying bacteria became active 随着气温升高和河流表层生物量的增大，表层水nh _ 4 ~ + 、 no _ 3 ~ -因大量消耗而降低；有机氮和颗粒态磷含量因生物颗粒的增加而加大； no _ 2 ~ -也会因硝化细菌活动的加剧而增加。
