爆破水平梯田整地技术及经济效益研究

太行山低山石质丘陵区多处于山西背斜东部边缘,花岗岩、片麻岩、砂岩等广泛分布,物理风化层较厚,但土层较薄,一般小于30cm。该区山场面积大,光热资源丰富。年平均气温7.4—13.9℃,大于0℃的积温为3479—5900℃;年均降水500—600mm,无霜期180—200天,对发展经济林具有得天独厚的条件。但阳坡太阳直射,受热量大,土壤墒情差,肥力不足,不利于林木的生长。采用爆破技术进行大规格高质量的水平梯田整地,可以扩大土壤容量因素,聚集地表迳流,是石质低山丘陵区发展经济林生产切实可行的技术措施。一、自然概况和试验方法     

改革开放后我国农民合作社制度分析

合作社的兴起可以将外部市场内部化,节省交易成本,但仍面临外部制度供给不足与内部制度建设的缺陷,因此需要寻找完善措施,促进其进一步的发展.本文主要分析合作社发育的需求诱因及面临的制度困境,并提出完善其制度的相关建议.     

以茶黄螨为食的黄瓜钝绥螨实验种群生命表

研究温度对黄瓜钝绥螨种群指数的影响，以防治对象茶黄螨为食，在23、25、28、30、31℃5组温度下组建实验种群生命表，并分析了净增殖率、内禀增长率、周限增长率、种群加倍需要天数、平均世代时间等生命参数与温度间的关系。25℃时黄瓜钝绥螨产卵量、产卵率、净增殖率、内禀增长率和周限增长率最大，分别达28．0952、0．7892、14．2380、0．1765、1．1930；寿命和产卵期最长，各为31．8947和30．5872天；而种群加倍需要天数最短，仅为3．6348天。结果表明：该温度是黄瓜钝绥螨种群生长和扩增的最适温度。     

香菇菌筒腐烂病研究初报

香菇菌筒腐烂病在福建省的香菇反季节栽培区发生流行，其病原为蘑菇滑刃线虫（Ａｐｈｅｌｅｎｃｈｏｉｄｅｃｏｍｐｏｓｔｉｃｏｌａ）和雅各布滑刃线虫（Ａ．ｊａｃｏｂｉ）．这２种线虫还能侵染凤尾菇、蘑菇、金针菇、猴头菇、竹荪、灰树花、灵芝等菌丝体．清除发病菌筒、冲洗病畦和畦面覆盖地膜能有效防治病害     

TP-M13-SSR技术在枸杞遗传多样性研究中的应用

利用在SSR扩增产物检测过程中的一种基于荧光测序技术的高通量低成本分析技术体系TP-M13-SSR对29份枸杞种质资源进行遗传多样性研究。13对引物共检测到78个等位基因,平均每个位点6个等位基因。群体平均的主等位基因频率(MAF)、有效等位基因数(NE)、观测杂合度(HO)、期望杂合度(HE)、Shannon’s信息指数(I)和多态信息含量(PIC)分别为0.625、2.684、0.401、0.514、1.103和0.487。聚类分析表明:29份枸杞种质间相似系数为0.66~0.97,平均相似系数为0.81;供试材料可分为5大类7亚类。研究表明,供试材料的遗传相似性较高,遗传多样性较低。TP-M13-SSR方法具有经济、灵敏、高效等优点,在枸杞遗传多样性研究中应用效果好。     

硫酸链霉素在治疗犬急性胃肠炎中的妙用

<正>春季万物复苏,也是细菌开始繁殖的时候。犬四季之中春季最易得胃肠炎,如果得不到及时救治,特别是急性胃肠炎,很快就会危及犬的生命,最后导致犬陷入昏睡、抽搐而死亡。     

魁蚶常温育苗高产技术研究

6月上中旬采攮主荣成海域的魁蚶,在常温条件下,投喂小球藻和小新月菱形藻,经11天促熟便可自然产卵。幼虫培育主要用湛江等鞭金藻和小球藻混投,育成率达55．6％,340m^3水体出壳长700μm以上稚贝20．1亿粒（591．2万粒／m^3),经40余天海上保苗出商品苗3．52亿粒（103．53万粒／m^3),保苗率17．5％。     

百合及半夏试管繁殖中的污染防治初报

取百合（Ｌｉｌｉｕｍｂｒｏｗｎｖａｒ．ｖｉｒｉｄｕｌｕｍＢａｋｅｒ）鳞片和半夏（Ｐｉｎｅｌｌｉａｔｅｒｎａｔａ（ＴＨ）Ｂｒｉ－ｅｔ．ｖａｒ．ｖｕｌｇａｒｉｓＥｎｇｌ．）块茎作外植体，基本培养基ＭＳ，附加成份有６－ＢＡ与ＫＴ和ＮＡＡ．经试验后进行批量生产时，发现严重的细菌污染，经微生物学鉴定，污染细菌系土壤杆菌属（Ａｇｒｏｂａｃｔｅｒｉｕｍ）的一个种，采用混合配制的灭菌剂Ｄ＿２（升汞加次氯酸纳）防治污染菌，其防除效果可使８０％以上的外植体正常生长而无污染。     

Effect of Poly-β-hydroxybutyrate on Reproductive Performance and Larval Development of Fenneropenaeus chinensis

In the present study, Fenneropenaeus chinensis individuals were assigned into six groups, and fed with a diet supplemented with 0(Con-trol), 0.5%(Group E0.5), 1.0%(Group E1.0), 2.0%(Group E2.0), 3.0%(Group E3.0) or 5.0%(Group E5.0) of poly-β-hydroxybutyrate(PHB) during their growth and spawning periods, to explore the effect of PHB on the reproductive performance of parents and the development of larvae. The experi-ment was lasted for 192 d to measure the mortality rate, relative percentage of survival(RPS), weight gain rate(WGR), specific growth rate(SGR) and cycle of gonadal development of parental shrimps, number of eggs, number of nauplii, stages of larval development and metamorphosis. The results indicated that PHB had an obvious effect on the fecundity of parental shrimps and growth performance of larva. Compared with control group, the mortality rate of broodstock in experimental groups decreased initially and increased subsequently with the increase of PHB concentration, while RPS showed an opposite pattern. The mortality rate of group E2.0 was the lowest among all groups, showing significant difference from that of other groups(P﹤0.05) except group E1.0(P﹥0.05). WGR of all experimental groups was higher than that of the control group, among which, group E2.0 and group E5.0 had significantly higher WGR than the control(P0.05). However, there was no significant difference in the cycle of gonadal development between the experimental groups and the control group(P ﹥ 0.05). The numbers of eggs and nauplii in the experimental groups were higher than those of the control group. And the numbers of eggs and nauplii in group E2.0 were significantly higher than those of the control(P ﹤ 0.05), bud showed no significant difference from those of other groups(P﹥0.05). However, there was no significant difference in the duration of larval devel-opment and metamorphosis among all the groups. In summary, PHB is capable of improving the reproductive performance of parents and the survival and development of larva in F. chinensis, and 2.0% is the optimal concentration of PHB supplemented to the diet.     

如何提高内勤的服务能力

<正>内勤工作是一项综合服务、承上启下的工作,具有协调左右、联系内外的纽带作用。内勤位轻责重,既要完成事务管理、文书处理、汇总信息、填写报表、起草文件等日常程序化的工作,又要完成领导临时交办的任务,还要为领导出谋划策,积极发挥参谋作用,协助领导做好各方面的