Preparation of Denitrifying Phosphorus Accumulating Bacterial Seed Liquid and Analysis of Phosphorus Removal Mechanism

In order to control the water eutrophication, microorganism agents with high capability of denitrifying phosphorus accumulation are required. A denitrifying poly-phosphate accumulating organisms(DNPAOS), B8(Pseudomonas putida sp.)was isolated from activated sludge in oxidation ditch of Anhui Tianchang wastewater treatment plant. Intracellular polyphosphate granule(Poly-P)dyeing method was used to optimize the culture conditions of Poly-P-producing Pseudomonas putida strain B8 seed liquid. The results showed that the appropriate culture conditions were as follow: pH value and temperature ranged from 6.5 to 7.0 and 30~32 ℃m respectively. The saturation values of dissolved oxygen varied from 70% to 88%(when velocity was in range of 120~140 r/min), 15~20 h proved to be the cultivation time. The seed liquid produced by B8 showed high phosphorus uptake rate in the processes of anaerobic-anoxic and anaerobic-aerobic in wastewater(89.73% and 94.09% respectively)In the anaerobic-anoxic process, the highest nitrate removal efficiency was 53.48%. Extracellular polymeric substances(EPS)extracting method and analysis of phosphorus removal characterization revealed that phosphorus removal was mainly caused by intracellular uptake, rather than by extracellular biological adsorption.     

日粮精粗比对瘤胃内环境及微生物区系影响的研究

瘤胃作为反刍动物体内的饲料加工厂,其内环境稳定和微生物区系的平衡影响着动物对饲料的利用,日粮精粗比的改变影响瘤胃内环境稳态以及微生物区系组成,从而影响反刍动物的生产效率。本文综述了日粮精粗比影响瘤胃pH、NH3-N浓度、VFA浓度和瘤胃微生物区系组成的研究进展,为在生产实践中提高反刍动物生产效率提供理论依据。     

EM菌液处理富营养化水体的条件研究

研究了不同条件下EM菌液对富营养化水体的净化效果,结果表明:以COD为主要处理目标的水体中,EM菌液的最适条件为V(EM)∶V(污水)=1/1 000、连续曝气、T＞25℃;以脱氮为主要处理目标的水体中,其最适条件为V(EM)∶V(污水)=8/1 000、间歇曝气、T＞25℃、pH为中性偏碱;以除磷为主要处理目标的水体中,EM菌液最适条件为V(EM)∶V(污水)=8/1 000、间歇曝气、T＞25℃、pH为中性偏碱.考虑到整体性、经济性和实用性,EM菌处理富营养化水体的最佳条件为V(EM)∶V(污水)=1/1 000、间歇曝气、T＞25℃、pH为中性偏碱.     

Use of an electromagnetic technique to determine sodicity in saline-sodic soils

Soil sodicity is an increasing problem in arid‐land irrigated soils that decreases soil permeability and crop production and increases soil erosion. The first step towards the control of sodic soils is the accurate diagnosis of the severity and spatial extent of the problem. Rapid identification and large‐scale mapping of sodium‐affected land will help to improve sodicity management. We evaluated the effectiveness of electromagnetic induction (EM) measurements in identifying, characterizing and mapping the spatial variability of sodicity in five saline‐sodic agricultural fields in Navarre (Spain). Each field was sampled at three 30‐cm soil depth increments at 10–30 sites for a total of 267 soil samples. The number of Geonics‐EM38 measurements in each field varied between 161 and 558, for a total of 1258 ECa (apparent electrical conductivity) readings. Multiple linear regression models established for each field predicted the average profile ECe (electrical conductivity of the saturation extract) and SAR (sodium adsorption ratio of the saturation extract) from ECa. Despite the lack of a direct causal relationship between ECa and SAR, EM measurements can be satisfactorily used for characterizing the spatial distribution of soil sodicity if ECe and SAR are significantly auto‐correlated. These results provide ancillary support for using EM measurements to indirectly characterize the spatial distribution of saline‐sodic soils. More research is needed to elucidate the usefulness of EM measurements in identifying soil sodicity in a wider range of salt and/or sodium‐affected soils.     

中兽医治疗奶牛腹泻良方与临床应用

腹泻是以排便次数增多、便稀溏为特征的一类疾病,根据不同特点又可分为泄泻、痢疾、便血三大类,每一类叉分为不同的证型。以临床病例为例,阐述腹泻的辨证方法、有效良方的选择及加减应用,既有同病同治、异病异治的常规方法,也有同病异治、异病同治的变化方法。     

通辽地区美国白蛾发生规律及防治对策初探

通过对通辽地区2016-2019年气温的调查统计得知:超过10℃的天数主要集中在3-11月,分别为174天、176天、182天、175天;超过10℃的有效积温分别为1 728.1日度、1 743.9日度、1 761.4日度、1 731.1日度;根据美国白蛾完成1个世代所需要的有效积温可知,发生代数分别为1.95代、1.97代、1.99代、1.96代;故通辽地区属于2代区。     

有效微生物群对生活污水中有机物的降解能力研究

采用正交试验方法．研究了有效微生物群（简称EM）对生活污水中有机物的降解能力．结果表明：EM能去除生活污水中的有机物，且在水温为25℃,水力停留时间（HRT）为48h，台液加入量（VEM／V污水）为1／104，曝气时间为HRT／3，进水PH值为8．0时处理效果最佳．在此最佳处理条件下，测定了污水中BOD5，CODcr随时问的变化情况，并与不加EM的测定结果进行了比较，加EM的污水中有机物去除率大大增加，2d后接近最高值并趋于稳定．EM在处理生活污水方面的优势是：较少或不产生污泥，曝气时间短，但如果要较好地应用于生活污水治理，必须提高污水中的EM浓度．     

THE ESTIMATE OF THE EFFECTIVE FUEL COMBUSTION VALUE OF FOREST COMMUNITY IN THE DAXINGAN MOUNTAIN

FoRESTFUELCoMBUSTIoNVALUECombustionvalueisanimportantparameterofmaterialburningcharacteri-stics.Itmeansthattheheatreleasesfromtheunitofmaterialcompleteburningtocooldownthestartingtemperatureofreactionmaterals(l).Undertheconditionofthesamepressureandenoughoxygeninthecombustor,materialscombustionva1ueisrelatedtotheinnerenergyofthematerialstatefromthebeginningtotheendduringreaction.Thecombustionvaluesuchasmeta1,carbon,hydrogencanbemeasuredaccurate1y.Toforestfuels,theirenergycan'tbethesam…     

竹缺爪螨生物学特性及其发生与环境的关系

研究结果表明,竹缺爪螨（ Ａｐｏｎｙｃｈｕｓｃｏｒｐｕｚａｅ Ｒｉｍａｎｄｏ） 营两性或孤雌生殖,孤雌生殖产雄卵;雌螨日产卵１ ～２ 粒,一生平均产卵９－８ 粒;林间自然性比为２－３５∶１ ;该螨以雌成螨和卵滞育,１１ 月中旬入蛰,３ 月上旬出蛰;在一定温度范围内,各螨态发育历期随温度升高而变短,从卵到成螨产卵有效积温为２８０－７６ 日度,发育起始温度为１３－３２ ℃。该螨还可取食苦绿竹（ Ｄｅｎｄｒｏｃａｌａｍ ｕｓｂａｓｉｈｉｒｓｕｔａ） 、长毛米筛竹（ Ｂａｍｂｕｓａ ｐａｃｈｉｎｅｎｓｉｓ） 、半耳箬竹（ Ｚｎｄｒｏｃａｌｍｕｓｌｏｎｇｉａｕｒｔｕｓ） ,并完成其生活史,在麻竹（ Ｄｅｎｄｒｏｃａｌａｍｏｐｓｉｓｌａｔｉｆｌｏｒｕｓ） 、毛金竹（ Ｐｈｙｌｌｏｓｔａｃｈｙｓｎｉｇｒａ） 上不能存活,在苦绿竹上完成１ 代需１８－４ ｄ;降雨的冲刷及浸水对幼、若、成螨存活影响较大,短期浸水对卵孵化影响不大,浸水１ ｄ 后卵孵化率降至３０－６５ ％ 。利用灰色关联度（Ｔｈｅ Ｇｒａｙ Ｓｅｑｕｅｎｃｅ） 方法分析湿度、气温、降雨量、天敌４ 个因子对该螨种群消长的影响,结果表明,４ 个因子对幼、若、成螨数量消长的关联序为湿度＞ 降雨量＞ 天敌     

Seasonal and interannual ecophysiological responses of beech (Fagus sylvatica) at its south-eastern distribution limit in Europe

Due to its wide European distribution and its drought-susceptibility, beech (Fagus sylvatica L.) received intensive attention recently in the light of global warming. Contrary to central European beech ecosystems, little is known about the ecophysiology of beech at its south-eastern European distribution limit. Here we tested whether climatic fluctuations during a three-year period affected the ecophysiology of a beech site in Greece. Attention was paid at comparing our findings to the intense effects the 2003 extreme drought had on beech forests in central Europe.