Erosion and Nutrient Loss on Sloping Land under Intense Cultivation in Southern Vietnam

To help improve the well‐being of the local people, a joint Vietnamese‐UK team set out to establish a way of estimating soil and nutrient losses under different land management scenarios, using field data extrapolated through remote sensing and GIS, to obtain catchment‐wide estimates of the impact of land cover change. Immigration from remote provinces to the Dong Phu District of Binh Phuóc Province, about 120 km north of Ho Chi Minh City, has led to disruption of soil surface stability on easily eroded clayey sandstones, creating rapid nutrient depletion that affects crop yields and siltation in the channel of the Rach Rat river downstream. The poor farmers of the areas see crop yields drop dramatically after two or three years of cultivation due to the fertility decline. Soil loss varies dramatically between wet season and dry season and with ground cover. Erosion bridge measurements showed a mean loss of 85.2 t ha^?1 y^?1 under cassava saplings with cashew nuts, 43.3 t ha^?1 y^?1 on uncultivated land and 41.7 t ha^?1 y^?1 under mature cassava. The rates of erosion were higher than those reported in many other parts of Vietnam, reflecting the high erodibility of the friable sandy soils on the steep side‐slopes of the Rach Rat catchment. However, although the actual measurements provide better soil loss data than estimates based on the parameters of soil loss equations, a large number of measurement sites is needed to provide adequate coverage of the crop and slope combinations in this dissected terrain for good prediction using GIS and remote sensing.     

韩国神杆的起源和特征——与中国大汶口文化和良渚文化中的神杆纹样的比较研究

本文通过在东夷文化圈中发现的神杆纹样,对韩国神杆的起源和功能展开讨论。我们可以发现,神杆起源于东夷文化圈,与稻作技术一道影响了韩国的南部地区。形态上的相似性,及功能上相似性,充分说明了韩国神杆与东夷文化圈的神杆有着紧密的联系。希望能够通过这样的研究,解决一部分关于神杆的起源和功能的问题。     

PETROGRAPHY AND PROVENANCE INTERPRETATION OF THE STONE MOULDS FOR BRONZE DAGGERS FROM THE GALDONG PREHISTORIC SITE, REPUBLIC OF KOREA*

This paper presents material characteristics and raw material provenance of the stone moulds for bronze slender daggers from Galdong. This type of bronze dagger is uniquely distributed in the Korean Peninsula and these stone moulds were the first to be found by excavation. The stone moulds were made of igneous hornblendite with course-grained holocrystalline textures. Based on petrological, mineralogical and geochemical characteristics, the original rock materials of the moulds were inferred to be derived from the Jangsu or Namwon areas which are about 50 km away from the excavation site. It is a notable achievement that this provenance study confirmed the domestic production of Korean-styled daggers.     

A PRACTICAL MODEL FOR SEISMIC ANALYSIS OF REINFORCED CONCRETE SHEAR WALL BUILDINGS

A simple macro-model for reinforced concrete shear walls is proposed, which consists of spring elements representing flexure and shear behaviour. The model for flexural behaviour is based on section analysis, while the model for shear behaviour is based on key parameters of the flexural behaviour. Four wall test specimens are selected to evaluate the reliability of the model. Modelling parameters for the backbone curves and the hysteretic rules are examined by conducting static and time history analyses, with the hysteretic response of a test specimen compared to that calculated using the proposed model. Results show some differences between measured and calculated shear force versus shear distortion relationships, but the model is acceptable because the differences do not significantly affect calculated global response. Parametric studies are also conducted to examine the influence of modelling parameters on seismic demand and capacity, which are the major design parameters for structural performance evaluation. Differences due to variation in modelling parameters are not significant, further indicating that the proposed model is reasonable.     

Sport,Localism and Social Capital in Rural Western Australia

Whilst there has been some research conducted on the role of sport in Australian rural communities, to date there has been little detailed discussion by social scientists and geographers on the association between sport and social capital. This paper identifies elements of social capital, at a community and regional social scale, which have been expressed through the activities and adaptive strategies of twenty‐five sporting clubs from the wheatbelt region of Western Australia. Most of the adaptive strategies are a direct result of the clubs being exposed to the processes of rural restructuring and include amalgamation and the spatial reorganisation of sporting competition locations. The importance of localism in rural communities is also examined through the issues of trust and distrust within a regional hierarchy context. The paper illustrates how sport is not only an important part of rural life but also an activity which plays an integral role in the formation of bonding and bridging social capital.     

Angels,Illusions, Hydras,and Chimeras: Violence and Humanity

Gibson, Kathleen R. and Tim Ingold, eds. Tools, Language and Cognition in Human Evolution. Cambridge: Cambridge University Press, 1993. xii + 483 pp. including index. $69.95 cloth.

Wallman, Joel. Aping Language. Cambridge: Cambridge University Press, 1992. xii + 191 pp. including notes, references, and indices. $44.95 cloth, $14.95 paper.     

明代盐法之演变与盐商之变化

明代的盐法是从宋元时期的盐法继承而来的,在国家专卖制度下组织了灶户制度,随着明初钞法的破坏,以及社会经济的变化,明代的盐法经历了一系列深刻的变化,如允许余盐和正盐一样可以公开进入国家的专卖体系;明中叶以后又出现了纳银开中制度等。所有的这些变化并不仅仅是盐法自身的变化,它也引起了与明代盐法变化密切相关的商人的地位与命运的变化。     

The geochemical evolution of very dilute CO2‐rich water in Chungcheong Province,Korea: processes and pathways

A geochemical study was carried out on the CO₂‐rich water occurring in granite areas of Chungcheong Province, Korea. In this area, very dilute and acidic CO₂‐rich waters [62–242 mg l^?1 in total dissolved solid (TDS), 4.0–5.3 in pH; group I) occur together with normal CO₂‐rich waters (317–988 mg l^?1 in TDS, 5.5–6.0 in pH; group II). The concentration levels and ages of group I water are similar to those of recently recharged and low‐mineralized groundwater (group III). Calculation of reaction pathways suggests that group I waters are produced by direct influx of CO₂ gas into group III type waters. When the groundwater is injected with CO₂, it develops the capacity to accept dissolved solids and it can evolve into water with very high solute concentrations. Whether the water is open or closed to the CO₂ gases becomes less important in controlling the reaction pathway of the CO₂‐rich groundwater when the initial pco ₂ is high. Our data show that most of the solutes are dissolved in the CO₂‐rich groundwater at pH > 5 where the weathering rates of silicates are very slow or independent of pH. Thus, groundwater age is likely more important in developing high solute concentrations in the CO₂‐rich groundwaters than accelerated weathering kinetics because of acidic pH caused by high pco ₂.