黑龙江森林火灾初次扑救派出人员数量模拟与分析

通过问卷调查收集了黑龙江省若干基层扑火指挥员对不同火场情景时的初次扑救派出人员数量 ,据此通过二次线性回归分别建立了根据火场情况 (火场面积、风级和到火场所需时间 )模拟森林火灾扑救初次派出人员数量的非线性模型 ,并对有关影响因素进行了分析。结果表明 ,(1)所建立的多元非线性模型能够较好地模拟派出人员数量 ;(2 )根据各地情况分别做出的模型模拟效果好 ,而以地区或省为单位进行模拟效果不好 ;(3)在火场面积小于 2hm2 时 ,多数人将风力看作是影响初次派出人员数量的首要因素 ,其次是到达火场所需时间 ,最后是火场面积 ;(4)随着指挥员工作时间的增长 ,模型中赋予到火场所需时间的权重增加 ,对到达火场所需时间越重视。     

毛竹林群落类型水源涵养功能的初步研究

对毛竹林群落类型水源涵养功能的研究结果认为:1.植冠截留量,毛竹、常绿落叶阔叶混交林>毛竹纯林>毛竹、杉木混交林;2.枯枝落叶层持水量,毛竹、常绿落叶阔叶混交林>毛竹、杉木混交林>毛竹纯林;3.土壤层的蓄水功能,毛什、常绿落叶阔叶混交林>毛竹纯林>毛竹、杉木混交林。通过本研究,将为毛竹林群落类型的科学管理及其生态经济功能发挥,提供依据。     

STUDY ON THE DEVELOPMENT AND FEEDING MANAGEMENT OF YOUNG DEMOISELLE CRANES

DemofsellecraneisthesmalleStoneofallcrans,ithasgreatdistributioninChinaandhasvarioushabitatThebredngareaismoStiylocatedineastInnerMongchaAUtonomousedOn,HeilowiirePrednceandWesternhlinPrOvince.ItwigratshereinthendddleofMarh,laysopboearyMaytothendddleofJune,andbonstondgratetothesouthinthelateoctobe.TherearelotsofreportSaboutecolOgicalndesOfbooiselecranes,butfewreportSabootthedeveoPInenofneshiop.TherehasbeenafewstUdiesaboutedngofdemoisel1ecranesinsomezoosinChina.msresearchmaterialisfrOm…     

良种刺槐硬枝扦插育苗试验

从山东定陶引进6个优良无性系进行硬枝扦插结果表明:1.生根率以1号、42号较高,分别为94.2％,87.7％;7号、68号次之,分别为81.2％、80.7％;78号、59号偏低,分别为68.3％、66.9％。2.插穗粗度与生根、成苗呈正相关。3.激素处理以50ppm效果较好,100ppm次之,30ppm较差。     

Wnt/β-catenin信号通路上游基因在山羊绒周期性再生及着色过程中的表达分析

为初步探究Wnt/β-catenin信号通路是否参与山羊绒周期性再生及着色过程,本试验采用实时荧光定量技术对Wnt/β-catenin信号通路上游基因β-catenin、Lef1/Tcf3及该通路拮抗基因Dkk1mRNA在白色绒山羊绒毛生长不同时期及黑、白色绒山羊绒毛生长旺盛期时体侧部皮肤组织中的相对表达量进行研究。结果显示,上述通路中β-catenin、Lef1/Tcf3基因mRNA在白色绒山羊不同时期体侧部皮肤组织中的相对表达量具有明显变化规律即生长前期缓慢上调,旺盛期时表达量最高,生长后期及退行期逐渐下调,休止期表达量最低;Dkk1基因mRNA在白色绒山羊不同时期体侧部皮肤组织中的相对表达量则无明显规律性。上述各基因mRNA在黑、白色绒山羊生长旺盛期时体侧部皮肤组织中的相对表达量并无显著差异(P0.05)。结果提示,Wnt/β-catenin信号通路参与山羊绒周期性再生过程,但该通路并不涉及生长旺盛期时绒毛的着色过程。     

高温处理对漆蜡碘值的影响

为了研究高温处理对漆蜡皂化值的影响情况,设处理温度分别为100、110、120、130、140和150℃,处理时间长度分别为1、2、3、4和5 h,就不同温度条件和处理时间对漆蜡碘值的影响情况进行了试验。结果表明:在100℃的温度条件下,不同处理时间的漆蜡碘值整体低于其他几组温度处理的,其变化范围为62.4~70.2 mg·g-1;当温度为150℃时,不同处理时间的漆蜡碘值比其他几组温度处理的整体上相对要高些,其变化范围为76.0~85.8 mg·g-1;不同温度处理的漆蜡碘值存在差异,且差异达到极显著水平,其中处理温度为100℃与其他5组处理温度(110、120、130、140和150℃)对漆蜡碘值的影响差异均达到极显著水平;110与120℃、130和150℃各组处理对漆蜡碘值的影响差异显著;120、130、140和150℃的温度条件下不同处理时间对漆蜡碘值的影响均存在差异,但相互之间的差异均未达到显著水平。     

2020年安徽省一季水稻生产情况分析

安徽省是全国水稻生产大省,其中以一季稻为主.该文基于安徽省水稻苗情监测系统,在对29个一季稻苗情监测县调查的基础上,总结了2020年安徽省一季稻生产形势、效益情况及面临的问题,并提出了相应的对策建议.     

Effects of dietary supplementation with Gynura procumbens (Merr.) on egg yolk cholesterol,excreta microflora and laying hen performance

1. The present study investigated the effects of dietary supplementation with Gynura procumbens on egg yolk and serum cholesterol and triglycerides, excreta microflora, laying performance and egg quality.

2. A total of 160 Hy-Line Brown layers (45 weeks old) were randomly assigned into 4 treatments on the basis of laying performance. Each treatment had 4 replicates with 10 birds each.

3. Dietary treatments were basal diet supplemented with 0 (control), 2.5, 5.0 and 7.5 g/kg diet G. procumbens during 56-d feeding period.

4. Serum (d 21, 42 and 56) and egg yolk (d 28, 42 and 56) cholesterol and triglycerides concentrations were linearly reduced with increasing dietary concentrations of G. procumbens.

5. Increasing dietary concentrations of G. procumbens linearly reduced the excreta total anaerobic bacteria (d 28), Clostridium sp. and Escherichia coli (d 28 and 56) populations.

6. Overall egg production and egg mass were linearly increased, and overall feed efficiency was linearly improved with increase in dietary G. procumbens.

7. Dietary increasing concentrations of G. procumbens linearly improved egg yolk colour (d 28 and 56) and breaking strength of eggs (d 56).

8. The results obtained in the present experiment indicate that dietary supplementation with G. procumbens could reduce the egg yolk cholesterol, suppresses harmful excreta microflora and improves layers performance.     

用可见光图像法测定林火蔓延速率的误差

图像法在林火蔓延速率测定中应用很广,但多数研究没有给出该方法的测定误差。采用图像法、标杆法和热电偶法对室内点烧实验的蔓延速率进行了测量,以标杆法和热电偶法的结果为基准,给出了图像法蔓延速率测定的误差,并对影响图像法测量精度的一些因子进行了分析。结果表明:1)以标杆法为基准,可见光图像测量的蔓延速率的平均绝对误差为0.035 4 m·min-1,平均相对误差为3.49%;以热电偶法为基准,可见光图像测量的蔓延速率的平均绝对误差为0.034 4 m·min-1,平均相对误差为3.31%。图像法与标杆法和热电偶法无显著差异。标杆法和热电偶法只能测得特定点或部分时段的蔓延速度,可见光图像测量法可以测量多点蔓延速度,因此,图像法比标杆法和热电偶法更具优势,可以替代标杆法或热电偶法。2)拍摄位置对误差影响不显著;风增加了蔓延速率,增加了图像法测量林火蔓延速率的绝对误差,相对误差变化不大。透视范围受拍摄角度的影响较大,随着拍摄角度的减小,图像法测量的误差增大。     

Evaluation of the nutritive value of Leucaena leucocephala leaf meal, inoculated with fish intestinal bacteria Bacillus subtilis and Bacillus circulans in formulated diets for rohu, Labeo rohita (Hamilton) fingerlings

Nine isonitrogenous (35% crude protein approximately) and isocaloric (18.37 kJ g^?1) experimental diets (RLL20–BCFL40) were formulated with either raw or treated (inoculated with fish intestinal bacteria) Leucaena leucocephala leaf meal at 20%, 30% and 40% levels replacing other ingredients partially from a fish meal based reference diet (RD). Two specific strains of fish intestinal bacteria, Bacillus subtilis (isolated from Cyprinus carpio) and B. circulans (isolated from Oreochromis mossambicus) having extracellular cellulolytic and amylolytic activities, were used to inoculate Leucaena leaf meal for 15 days at 37°C. The crude fibre, cellulose and hemicellulose contents and the antinutritional factors, tannin, phytic acid and mimosine in the leaf meal decreased due to inoculation. However, free amino acids and fatty acids increased in the treated leaf meal. The response of rohu, Labeo rohita, fingerlings fed the experimental diets for 80 days was compared with fish fed a RD. Both the inclusion level and type of Leucaena leaf meal in diets significantly affected the growth performance of rohu. Fish fed diets containing inoculated Leucaena leaf meal performed better in comparison with those with the RD. On the basis of growth response, feed conversion ratio, protein efficiency ratio and apparent net protein utilization, diet formulated with 30%Leucaena leaf meal inoculated with B. circulans resulted in the best performance of rohu fingerlings followed by diet with 40%B. subtilis inoculated Leucaena leaf meal. The apparent protein digestibility (APD) was better in fish fed diets containing B. circulans inoculated leaf meal. An increasing level of raw Leucaena leaf meal was associated with a decrease in the carcass protein content of rohu fingerlings. The activity of α‐amylase increased with the increasing level of treated leaf meal in diets. Cellulase activity increased with increasing level of inclusion of raw leaf meal, and was comparatively lower in fish fed diets with treated leaf meal. Activities of protease and lipase were higher in fish fed the RD. The results showed that it is possible to incorporate Leucaena leaf meal inoculated with enzyme‐producing fish intestinal bacteria in carp diets up to 40% level of inclusion.