甘蔗间作花生对不同耕层土壤微生态的影响

甘蔗间作花生是我国华南地区特有的高效种植模式。本文研究了甘蔗/花生间作不同耕层土壤养分、酶、微生物的变化特征及其相关性。结果表明，相比单作而言，0～20 cm间作花生土壤有效氮、有机质、微生物量氮含量、真菌、放线菌数量、蛋白酶活性及间作甘蔗土壤细菌、放线菌、总微生物数量、微生物量氮含量及蛋白酶活性均显著增加；20～40 cm间作甘蔗土壤全磷、全钾、蛋白酶活性及间作花生土壤放线菌、蛋白酶活性显著增加；40~ 60 cm间作花生土壤真菌、蔗糖酶、微生物量碳含量显著增加；相反，间作甘蔗土壤蔗糖酶活性均显著低于单作甘蔗处理；间作土壤有效氮磷钾、有机质含量、脲酶、酸性磷酸酶活性、微生物数量均随着土壤深度的增加而表现出降低的趋势；间作土壤有效养分与脲酶、酸性磷酸酶、微生物量氮及微生物数量呈显著或极显著正相关。表明甘蔗花生间作条件下土壤养分、酶、微生物相互作用，共同维持良好的土壤微生态环境。     

浅谈我国农林复合经营模式及研究进展

阐述了农林复合经营的概念、特点及意义,总结了我国农林复合经营的发展历史及模式,综述了国内的研究进展,为农林复合经营在实践中的推广和理论研究提供参考。     

乌兰布和沙漠东缘沙地杨树育苗及育苗密度讨论

通过对乌兰布和沙漠特定类型及大苗壮苗、就地育苗在杨树丰产林营造中的重要性，对育苗密度与杨树大苗的产苗量进行了一定分析，提出了适合于该地区的杨树育苗密度。     

Theory Model of Viscoelasticity of Hepatocellullar Carcinoma Cells by Micropipette Aspiration Method

The mechanical properties of cells are relation to their structure and function. Viscoelasticity is a kind of essence properties of cells and an important researching contents in the field of cellular mechanics. Micropipette aspiration technology is an advanced artifice on the level of single cell to study the mechanics of cells. In order to investigate the theory and method in researching mechanical properties of hepatocellullar carcinoma cells with micropipette aspiration, hepatocellullar carcinoma cells was regarded as an even linear solid and the standard linear solid viscoelastic model was chosen to describe viscoelasticity of hepatocellullar carcinoma cells, theory model of viscoelasticity of hepatocellullar carcinoma cells by micropipette aspiration was established according to the related papers, it will provide methodology reference for studies in this fields.     

Product Lifecycle Information Model

The technology of product modeling is the basis of Advanced Manufacturing Technologies.Product model is the key to realize sharing information in developing product.Three kinds of product model are compared.Base on it,the concept of product lifecyele information model and its components,the architecture and the approach to modeling are presented.     

Lightning Protection Performance of Transmission Line with High Tower and Great Span

This paper studies lightning protection performance of transmission line with high tower and great span, and puts forward the lightning shielding model of transmission line with high tower and great span. The model simulates the developing process of lightning downward leader, and take the effect of upward leader to downward leader into account. Moreover, the model consider backward lightning , that is even downward leader have developed lower than transmission line, Which will be occur lightning line. Aim at a certain sea transmission line with great span, its lightning performance is calculated with regular method, EGM and the model. The results have been analysed and compared. Because of thinking over backward lightning , the model can be used for calculating lightning shield performance of all kinds of transmission lines.     

密封式防涝挡鼠板设计应用

<正>配电室是电力系统的重要组成部分,在雨季容易遭受洪涝灾害,危及电力系统稳定运行,特别是老旧小区、乡村等相关设施配置相对落后的地区影响更为严重,应做好防涝措施。作为防止鼠类进入配电室等重要用电场所的重要设施之一,现有在用挡鼠板大多功能复合性低,单位占地面积大,利用率不高,且不具备防涝功能。为解决上述问题,特研制了一种具备防鼠和阻断水源双重功能的密封式防涝挡鼠板。通过调查分析,配电室进水主要有4个方面原因,配电室结构设计不合理、未有效封堵、无完善的排水系统,以及不可抗力原因。     

马尾松人工幼林枯枝落叶层的水文特性及养分贮量

为了探明不同林龄马尾松人工林枯枝落叶层现存量、贮水量以及养分贮量的变化规律及其互相之间的关系,在桂西北乐里林场选择3种林龄段马尾松人工林分别建立标准地,对林地枯枝落叶物进行取样测定。结果表明:1)该区9～14a生马尾松人工林枯枝落叶层现存量为3.31～5.64t/hm2,最大净贮水量为4.48～10.19t/hm2,并随林龄的增大而递增。2)林地枯枝落叶层元素养分含量以N,Ca为最大,大约各占10种元素养分总含量的1/3～1/2;Mg,K元素含量次之;Mn,Fe,P,Zn,Cu,B元素含量微小。林地枯枝落叶层养分总贮量为70.66～98.82kg/hm2,随林龄的增大而递增。3)林地枯枝落叶层现存量、最大净贮水量以及元素养分总贮量分别与林龄存在密切的相关性,其回归方程各异。因此,可以根据不同林龄段来预测枯枝落叶层现存量、最大净贮水量和元素养分总贮量。     

肉兔的饲养管理

近年来,肉兔在我县得到了良好的发展,为促进农民增收和调节畜牧业产业结构起到了重要的作用。要保持肉兔持续、快速的发展,就必须根据肉兔的习性和行为,加强饲养管理,提高养殖经济效益。     

如何提高黄鳝养殖产量

鳝鱼肉味鲜美、营养丰富,价格居高不下。现将如何提高黄鳝养殖产量介绍如下： 1 鳝鱼池的建造 水泥池面积以30～40m。为宜,池面和底部要打磨光滑,以免鳝鱼在活动中擦伤皮肤造成各种细菌、病毒的感染,池子顶端应高出水位35cm左右,并设置自然溢水口,出水口用网片固定以免黄鳝逃跑。水泥池养鳝分有土和无土两种养殖方式,这两种方式都要栽种水花生或水葫芦,