ANALYSIS ON SPATIAL FEATURES OF LUCC BASED ON REMOTE SENSING AND GIS IN CHINA

In view of the large quantities of areas,complex landform and dynamic change of resources and environ-ment in China,China has already funded abundantly a series of macro remote sensing investigation projects in land use cover change(LUCC) since 1990.Supported by the achievements of such projects,Chinese resources,environmental and remote sensing database(CRERS) was created.In this paper,we standardized the LUCC dataset of CRERS at scale of 1km,which facilitated the study of spatial features of LUCC in China.The analysis on the spatial features of LUCC and their causes of formation in China are based on the CRERS supported by the technologies of Geographic Information System(GIS) .The whole research was based on the grade index of land use,ecological environmental index and index of population density.Based on the correlation analysis,we found that the special features of LUCC were closely related with those of ecological environment and population density,which resulted form that areas with better ecological environ-ment and high production potential of land were easy and convenient for human being to live,which,furthermore,led to the aggravation of excessive exploitation of land resources there.     

A Correlation between Proton Events and Hα Flares and its Possible Interpretation

1 INTRoDUCTIONIt is well known that solar proton flares are maiuly correlated with strong, bright H. flares,in particular, with two ribbon flares. Ellison et al. (l961) were the first to draw attelltion tothe faCt that all cosndc-ray flares had the typical two-ribbon shape. Then, Svestka and Simon(1976) drew uP the "Catalog of Solar Particle Evellts, 195ty1969", and using this Catalog,Dodson and Hedeman could safely identify the flare sources for 50 proton events. Out of the 50idellti…     

The Thermodynamic and Dynamical Features of Double Front Structures During 21-31 July 1998 in China

1. IntroductionDuring June and July, from the mid-lower reachesof the Yangtze River basin in China to southern Japan,a precipitation zone with intensive torrential rain ap-pears and lasts for two to three weeks. This phe-nomenon is called the "mei-yu" in …     

抚顺市煤矸石对生态环境的影响及综合利用

抚顺市煤田开采悠久，煤矸石的堆积量大，对生态环境的影响显著，并且占用大量土地，严重污染环境，以及出现边坡失稳现象。本文详细地分析了煤矸石对生态环境的影响，阐述了目前煤矸石资源化的综合利用情况，以及开发利用煤矸石具有环保和经济双重意义。     

Space/Time Features of the Secular Variation in 1951–1998 Northern 500-hPa Height

Summary  This paper presents a trend coefficient as a characteristic index with which to investigate the 1951–1998 secular trend variation (STV) of northern 500-hPa height on a seasonal basis. Evidence suggests that low (high) latitude 500 hPa geopotential height displays a remarkably positive (negative) trend; the positive anomaly of the height is maintained over NW Africa, the western Mediterranean Sea and North Africa, mid-Pacific at lower latitudes, Lake Baikal and area to the east and NW North America; the height drops significantly over the Aleutians and North Pacific, the area to the south of the Greenland and NE North America and the sector to the north of the Arabian Sea. Further, analysis of abrupt change shows that the 500-hPa circulations experience noticeable sudden change twice, once around the early 1960s and again in 1976, during which period the height exhibits great differences between the Pacific and Atlantic. In the first period it drops (rises) over the mid-Atlantic at lower latitudes (NW Africa); in the second period the height rises (drops) over the mid-Pacific at lower latitudes and Lake Baikal (the North Pacific). Statistical tests indicate that in the 1976 case the low-latitude positive abrupt change is even more noticeable compared to the negative of the North Pacific, thus representing a large-scale jumping event of the northern 500-hPa height. Received April 9, 1999/Revised October 15, 1999     

亚硝酸根的动力学分析法进展

评述了动力学分析法测定亚硝酸根的发展状况,包括指示反应、线性范围、检测限和分析方法的应用,引用参考文献８１篇。     

内蒙古大青山的新生代剥蚀和隆起

内蒙古大青山及其毗邻的呼和浩特断陷盆地是研究剥蚀和地壳均衡隆起的理想地区。本文提供了大青山新生代等高峰顶面和晚第四纪河流阶地拱曲变形的证据 ;依据呼和浩特盆地的地震探测获得的沉积厚度 ,计算出大青山的剥蚀和地壳均衡隆起量 ;提出地壳均衡隆起是大青山晚第三纪以来主要的区域变形机制 ;指出由於地壳均衡隆起 ,剥蚀作用最终只是使大青山高度略微降低 ;同时复原了大青山新生代景观演化历史。本文还讨论了剥蚀和地壳均衡隆起之间的耦合关系以及断裂作用在其中的地位 ,认为大青山新生代景观演化是在剥蚀去荷失去重力平衡和均衡隆起恢复重力平衡的长期自身耦合作用中进行的 ,在此过程中断层的下降盘由主动盘变成被动盘     

Research on the Tectonic Environment and Seismogenic Mechanism of the 1927 Gulang Great Earthquake with M=8.0

In this paper, we discussed the seismotectonic environment of the deep-seated and shallowcrust and seismological and geological model caused the 1927 Gulang great earthquake, basedon the recent research concerning about the active fault, surface rupture, fault planesolution, seismic activity, as well as the deep geophysical exploration data analysis in theepicentral area.The result shows that the 1927 Gulang great earthquake was caused by NE-SW-strikingcompressional thrusting. It was a latest event occurred in the reverse fault-folding belt thatdeveloped along the intracrustal decollement.     

Characteristics of Large Earthquake Recurrence and Determination of Average Recurrence Interval Value

Paleoearthquakes in the Yanqing-Huailai basin and on the Haiyuan fault are studied in detail.The result indicates that the recurrence behavior of large earthquakes is of a wide variety.Characteristic earthquakes show the behavior characteristics of the activity of most faults,butthey are of different grades,the recurrence interval of large earthquakes is of staged nature,and the interaction between faults has effects on the recurrence sequence of large earthquakes.Thus,when the recurrence behavior of large earthquakes is staged in time or when thegradation of characteristic earthquakes has led to a sharp difference in recurrence intervalbetween paleoearthquakes of different intensities,for estimating the large earthquake risk bythe deterministic method and time-dependent probabilistic method,it is necessary to calculatethe recurrence interval value separately for each specific stage or grade in order that theaverage recurrence interval values of different stages can be determined.