三峡水库消落区土壤胶体对Cd在土壤中迁移的影响

选取三峡水库消落区典型土壤,即紫色土、黄壤、紫色潮土和灰棕潮土为研究对象,以相应土壤胶体、蒙脱石矿物的10 mg/L Cd(NO3)2淋洗液分别淋洗土柱,研究了水分散态胶体对镉在土柱中迁移的影响.添加上述胶体的镉淋洗液,在紫色土、黄壤、紫色潮土和灰棕潮土土柱中镉迁移量分别是对照的1.18～4.96,1.05～2.37,1.10～4.33,1.03～3.33倍.结果表明胶体能够促进镉离子在土层中的迁移,其迁移能力遵循紫色土胶体≥紫色潮土胶体＞灰棕潮土胶体＞蒙脱石胶体＞黄壤胶体的规律.由此得出,胶体吸附态镉的迁移能力取决于胶体类型和土柱性质.     

致灾农业昆虫捕集滑板表面结构仿生构建与性能验证

致灾农业昆虫光电诱导滑移捕集技术中,致使昆虫产生良好滑移行为的捕集滑板是获取该技术高效应用的关键。红瓶猪笼草(Nepenthes alata)叶笼滑移区依靠特殊形貌对昆虫附着系统表现出显著滑移功能,为致灾农业昆虫捕集滑板的研制提供了仿生原型。采用扫描电子显微镜(scanning electron microscope,SEM)与三维白光形貌干涉仪(scanning white light interferometer,SWLI)对滑移区表面微形貌进行观测分析并获取三维结构参数,据此构建了致灾农业昆虫捕集滑板表面结构的仿生模型;采用激光微纳加工技术和高压静电吸附技术实现捕集滑板的仿生制备。为验证仿生制备致灾农业昆虫捕集滑板功效,测试了蝗虫(Locusta migratoria manilensis)在捕集滑板和仿生原型的附着力,结果分别为(402.9±26.1)m N和(361.9±25.5)m N,相近的附着力预示研制的致灾农业昆虫捕集滑板具有与仿生原型类似的性能。     

根-土界面区域磷酸盐的分布和移动: Ⅲ. 动力学

The depletion rate of phosphate in the soil-root interface zone increased along with growth and phosphate uptske of wheat or maize,which indicated that the phosphate distribution in soil near the root surface agreed well with the phosphate movement in rhizosphere and phosphate uptake by plant,The relative accumulation zone of phosphate within 0.5mm apart from the root surface developed at the 15th day or so after cultivating wheat or maize since the root phosphate secretion increased gradually in this stage.The phosphate distribution in the soil-root interface zone against the growing time(t)and the distance from the root plane(x) could be described by the non-linear regression equation with the third powers of x and t.     

A review with some applications of statistical selection procedures for selecting the best variety

Summary Statistical selection procedures are discussed in general terms. Statistical selection procedures have been designed specifically to answer questions like Which treatment or variety can be considered to be the best?. In a certain sense statistical selection procedures are more realistic in answering such a question than the usual testing and multiple comparisons procedures. The statistical procedures of Bechhofer and Gupta are considered. Some practical applications are given. Finally, attention is paid to the relatively new combined procedure of Hsu (1981, 1984) and the procedures of Somerville (1985).     

黑龙江省农村住宅利用太阳能采暖的探讨

主要回顾总结了该省自1986年开始，从理论和实践上探讨在高寒地区农村住宅利用太阳能采暖节能的可行性的过程及推广应用情况。     

极早熟糯玉米杂交种克粘1号及寒区栽培技术

目前在我国推广的糯玉米品种较多.克粘1号(KN1)是黑龙江省农业科学院小麦研究所于1997年杂交育成,经连续三年在牡丹江地区进行生产试验,平均产量5 540 kg/hm2,鲜果穗产量为22 500 kg/hm2.克粘1号糯玉米以其早熟、用途广泛,适口性好,风味佳,受到欢迎,是寒区鲜食市场上第一期种植的首选品种.有广泛的应用前景.     

传统捕鱼权与专属经济区制度

根据1958年通过的《领海及毗连区公约》和1982年通过的《联合国海洋法公约》确立的领海制度,沿海国在其领海内享有专属捕鱼权。在20世纪80年代以前,经过国际社会的长期讨论与实践,传统捕鱼权得到了多数沿海国的认可与尊重,即沿海国在其专属渔区或管辖范围内拥有优先权,而其他国家在其国民长期以来惯常捕鱼的区域享有继续捕鱼的权利。但是,1982年《联合国海洋法公约》确立的专属经济区制度却否定了其他国家的国民在沿海国专属渔区或管辖范围内享有的传统捕鱼权。鉴于传统捕鱼权在专属经济区中的地位,当我国与有关国家进行东、黄海海域划界时,应强调地质、地貌、海岸线的长度、渔业资源的合理保护和对渔业资源的公平利用等,特别是经济因素,以争取合理的利益。     

Age structure of Pacific saury Cololabis saira based on observations of the hyaline zones in the otolith and length frequency distributions

ABSTRACT:   The ages ( n  = 11 178) and length frequency distributions ( n  = 173 300) of Pacific saury Cololabis saira caught from September to November in 1989–2000 were examined. Most specimens were determined as either age 0 or 1 based on the number of annual rings in the otolith. The knob lengths (length from the tip of the lower jaw to the posterior end of the muscular knob on the caudal peduncle) at which 50% of the fish were age 1 ranged 277.8–304.7 mm. Analysis of length frequency distribution was also useful to divide the knob lengths of the two groups. The modal lengths of age 1 fish ranged 303.9–325.9 mm.     

华山松种子区区划及贵州用种调拔区

我省华山松种源研究多点试验结果,将华山松分布区划分为3个种子区和4个种子亚区。贵州属云贵高原种子区的北部亚区,其生产用种的调拨,除本省威宁、赫章种子外,可调用本亚区内云南东川、会泽,四川会理、会东的种子;云贵高原南部亚区(云南保山、腾冲、梁河、昌宁)是贵州华山松生产用种优良供种区,比本省威宁种子有更大的增产潜力。但决不能调用秦巴山地生产的种子,以免造成损失。