网状河流和分汊河流的河型归属讨论

河流的河道平面形态分类有多种方案 ,其中Rust的分类因为分出了网状河流而得到沉积学家的更多关注。中国地貌学界和水利学界则更关注钱宁的分类 ,其中包括分汊河流。目前 ,许多研究人员把网状河流和分汊河流当作同一类型的河流。文中从河型的定义、河道平面形态、地下沉积物特征、水动力、新河道形成机理和发育的地貌部位等方面对分汊河流和网状河流进行对比 ,根据对比结果认为它们是不同的河型。为了便于沉积学家、水利学家以及地貌学家之间相互交流各自有关河流的研究成果 ,需要提出一个更符合实际的冲积河流分类方案。     

重新认识和划分矿床类型——隐伏岩金矿体定位预测的一个重要前提

目前流行的岩金矿床分类方案是依据地表已遭受一定剥蚀的矿床地质特征和成因理论而建立的 ,为了有效地开展隐伏岩金矿体定位预测工作 ,必需重新认识和划分矿床类型 ,弄清哪些特征真正具有可比性。文中分析了现有分类方案中几个亟待解决的问题 ,结合金矿的“特殊性” ,提出应简化矿床类型、将成矿区带作为分类的目标 ,将成矿系统作为分类的基础。     

Classification, M inerogenic Models and Prospecting of Realgar/Orpiment Deposits in China

China's realgar/orpiment deposits may be classified into three types, the stratabound, hot-water sedimentary and hydrothermal, according to their mineralizing processes, geological occurrences, tectonic and geochemi-cal features. The three types may be further distinguished into seven subtypes, namely, the Xiaguan, Shuiluo, Jiepaiyu, Songpan, Shixia, Wangzhuang and Ninghshan ones. On this basis three minerogenic models are established, and based on studies of their geochemistry and minerogenic mechanisms the prerequisites for prospecting for these types of deposits are given in the paper.     

Classification of Mineral Resources Associated and Accompanied with Coal Measures

The paper discusses the concept of mineral resources associated with coal measures. A rational and scientific classification of such mineral resources becomes more necessary with the development of science and technology. A classification scheme is proposed based on compositions and physical properties and the utilization of these associated minerals.     

滇中地区常绿阔叶林树种多样性比较研究

分别测定了滇中地区两类代表性群落即高原水平带上的半湿润常绿阔叶林和山地垂直带上的中山湿性常绿阔叶林的树种多样性 (Shannon -Wiener指数H ,Simpson指数D和α指数 ) ,并进行了比较研究。结果表明 ,中山湿性常绿阔叶林的树种多样性 (H =2 .53± 0 .1 4 ;D =1 1 .76± 2 .85;α =8.1 2± 1 .72 )远高于半湿润常绿阔叶林 (H =1 .52± 0 .35;D =3.88± 1 .90 ;α=3.4 4± 1 .31 )     

森林经营措施对土壤的扰动和压实影响

根据森林经营措施对林地土壤的扰动和压实及其对树木生长和森林生产力的影响 ,指出森林经营措施对土壤造成的干扰是长期存在的 ,干扰强度越大 ,对林地生产力的影响越严重。从伐区作业、林地清理、整地、幼林抚育等方面提出减少土壤受扰动和压实的具体措施 ,为减少经营措施对林地生态系统的影响 ,从而改进传统的森林经营措施 ,实现森林可持续经营提供借鉴。     

The orbit of the nearby low-mass binary Gliese 600

We have computed a combined spectroscopic-interferometric orbit for the nearby binary Gliese 600 discovered by us. The orbital period is 2.78 years, and the semimajor axis is 100 mas (0.1″). Its M0 V components are almost identical and have a mass of 0.5M _⊙. The mass ratio is uncertain because of the low radialvelocity semiamplitude (7 km s^?1) associated with the low orbital inclination (37°). The orbital parallax of the binary (52±11 mas) matches its dynamical and photometric parallaxes but differs significantly from the Hipparcos parallax (44.3±1.6) mas; the latter was probably distorted by the orbital motion that was not taken into account.     

Micropropagation of Acacia seyal Del. in vitro

In vitro mass propagation of Acacia seyal Del. was achieved using seedling shoot tip explants on Murashige and Skoog (MS) medium supplemented with 6-benzyladenine (BA) or Thidiazuron (TDZ) with ∝-Naphtalene acetic acid (NAA). The best result was obtained with BA in the presence of NAA. The greatest shoot multiplication with long shoots was observed on media containing (mg l^-1) 2·0 BA with 0·1 or 0·5 NAA and 4·0 BA with 0·1 NAA; with 6·4 and 6·7 mean number of shoots, respectively. TDZ also induced multiple shoots but most of the shoots were stunted. Microshoots were rooted better on half-MS salts supplemented with Indole-3-butyric acid (IBA). The highest rooting percentage (80%) and root number (4·9 roots/microshoot) were promoted by 4·0 mg IBA. The plantlets (90%) successfully survived acclimatization ex vitro.     

中国旅游资源分类系统与类型评价

旅游资源是旅游业可持续发展的物质基础和旅游生产力增长的潜力所在。作为国家普查规范和技术导引,旅游资源普查必然依据一定的分类系统,通过不同类型地域的实践,在《中国旅游资源普查规范》（试行篇）基础上,新拟的旅游资源分类系统完善分类分级分态系统,工增加到３个景系,１０个景类,９８上景型。在表征资源单体规模时,以景域、景段、景元三个空间尺度等级来区别,并根据资源所处状态分为已开发态、待开发态和潜在势态三种     

中国土地荒漠化分类系统探讨

通过对前人研究土地荒漠化类型划分成果的学习消化并结合自己多年对土地荒漠化研究,提出我国土地荒漠化类型划分的原则和分类系统,以主导营力和表现形式为划分指标,不但将全国划分为流水作用、风力作用、化学作用和人为直接作用等4个类型,而且从不同类型中再细分出侵蚀劣地,侵蚀裸岩、裸土,堆积沙砾地,土壤劣化;风蚀劣地,风积半流动沙丘,风蚀裸地,土壤粗化、贫化;次生盐渍化、酸化、碱化地,三废污染,农药、化肥污染;废弃土、石、渣堆积,人工挖掘劣地等13个亚类,并对其分布、特征及形成等作了简要论述。