滇东牛头山地区早震旦世沉积相及大地构造环境

野外调查和室内分析表明,牛头山地区陆良组、牛头山组应属下震旦统,其沉积相类型自下而上可划分为辫状河相、河口湾相、浅海相、滨海相、浅海相及三角洲相。“牛头山古陆”在早震旦世是不存在的。牛头山地区当时为被动大陆边缘。     

The utilization of two‐metre Countryside Stewardship Scheme grass margins by the gatekeeper Pyronia tithonus (L)

The utilization of 2‐m Countryside Stewardship Scheme (CSS) grass margins by Pyronia tithonus was investigated during the period 1997–2000 at three farms in Essex, UK. The aims of the research were to investigate whether 2‐m grass margins established using the CSS would provide suitable habitat for P. tithonus. Overall, there was no significant difference between P. tithonus abundance on the 2‐m grass margins and the control sections without margins, but significantly more P. tithonus were observed on the 2‐m grass margins in 2000 than in 1997. There was a strong relationship between P. tithonus abundance and the presence of hedgerows, and significantly more P. tithonus were recorded on 2‐m grass margins next to hedgerows than on 2‐m grass margins established in areas without adjacent hedgerows. It was suggested that P. tithonus would benefit most from habitats with 2‐m grass margins sown with a seed mixture containing a range of fine‐leaved grasses and wildflowers, next to a hedgerow, and managed in accordance with current practices.     

煤峪口矿边角煤炭资源的开采

介绍了煤峪口矿及其存在的边角煤炭资源的基本情况,分析了开采边角煤炭资源的可行性,提出了开采边角煤炭资源的具体措施。     

沉积边缘与跌积边缘—碳酸盐大陆斜坡古代实例及特征

大陆斜坡是联系浅水台地与深水盆地的枢纽地带,以包括巨大岩块在内的巨厚斜坡边缘型沉积为特征。黔南地区在中三叠世时,具有活跃的碳酸盐大陆斜坡沉积,按其性质,该期斜坡环境可分为沉积边缘型与跌积边缘型。它们主要受强烈而不均匀的断裂作用控制。在不同类型斜坡上,各种沉积作用标志也有较明显的差异。     

Recent progress of deep seismic experiments and studies of crustal structure in northern South China Sea

The South China Sea (SCS) is one of the largest marginal seas in the western Pacific. Its northern part has the features of a passive continental margin. The studies of deep crustal structure in this area are very important for understanding the tectonic nature, evolution history, basin formation of the northern margin, and the origin of the SCS. In the past decades, the deep seismic experiments of crustal studies in the northern SCS have gone through three stages, namely the sonobuoy, two-ship Expanding Spread Profile (ESP), and Ocean Bottom Hydrophone/Seismometer (OBH/OBS). Along the continental slope, the sonobuoy experiments provided useful information about the velocity structure of the upper crust, while the ESP data recorded for the first time the seismic signals from deep crustal structure and Moho interface. And the OBH/OBS profiles revealed the crustal structure in much greater detail. This paper first gives a brief historical review of these deep seismic experiments and studies, then a summary of the latest progress and important research results. The remaining problems and suggestions for further research work are presented as conclusive remarks.     

高速公路边界属性对防护林区昆虫多样性的影响

调查了高速公路不同边界类型和护坡道荆条种植区内昆虫群落的种类组成及数量变化,利用主成分分析和聚类方法分析了高速公路不同边界类型的属性与边界内生物多样性的关系。结果表明,护坡道荆条种植区内的昆虫群落多样性都比3种类型边界防护林内的高。主成分和聚类分析表明,边界上的昆虫群落多样性与物种数、年蜘蛛数量及其标准差、植被的盖度几个指标呈正相关,与边界宽度呈负相关;各边界类型都反映了昆虫、植被盖度和边界的结构等方面构成的综合特征,而非单一指标的简单组合。