浅谈长江大流域旅游资源开发

本文对长江流域旅游资源的特点和开发条件进行了评价,同时论述了浦东开发对其的影响,提出了策应浦东开发的措施选择。     

Methodological considerations in forecasting Saudi Arabian economic growth

The author surveys a number of factors responsible for Saudi Arabian economic growth and concludes that, contrary to popular belief, the petroleum sectors have had more than just a short-run transitory stimulating impact on the domestic economy. It appears that changes in the level of exports (and resulting government expenditures) have a number of impacts on the non-oil sector of the economy which take some time for their full effect to be felt. Government expenditures have become somewhat independent of current oil exports, so the current oil glut and falling revenues for Saudi Arabia are not likely to be translated into slower non-oil income growth.     

Normal and abnormal fetal cardiac anatomy

The heart is often perceived as a difficult organ to understand by ultrasound during fetal life. This is undoubtedly reflected in the low detection rate of cardiac abnormalities as compared to those of most other organ systems in the fetus. In this article we start by updating classical concepts of cardiac embryology, many of which were previously difficult to understand since they were overly simplistic or purely observational. We then lead on to the structure and growth of the fully formed fetal heart where we review the anatomy and ultrasound appearances in detail and provide comparisons with major abnormalities. We emphasise the fact that a solid understanding of cardiac anatomy can enable those involved in fetal medicine to make full use of the views of the heart that are obtained by ultrasound and which are often only transient. Copyright © 2004 John Wiley & Sons, Ltd.     

整地施肥对尾叶桉生长及土壤性状的影响

整地施肥试验结果表明，全垦、带垦和穴垦三种整地方式以及施肥对尾叶按造林成活率和保存率均无明显的影响，成活率在９５％－９８．８％之间，保存率在９２．１％－９７．７％之间．整地能改变土壤性状，如土壤孔隙度全垦为５７．８８％。穴垦为４９．４２％；对林木生长有促进作用，但作用效果很快减少，如造林３年后的林木材积全垦、带垦分别为穴垦的１３６．４％和１２０．０％，５年后却分别下降到１１６．５％和１０８．３％．施肥可提高土壤养分，促进林木生长．造林５年后的调查结果，穴垦施肥林地的土壤有机质、速效Ｎ分别为１５．４４７ｇ／ｋｇ和４９．２３０ｍｇ／ｋｇ，林木年均树高生长为１．２５ｍ；不施肥处理的有机质、速效Ｎ分别为１０．３８８ｇ／ｋｇ和３５．７１５ｍｇ／ｋｇ，林木年平均生长量为０．３５ｍ；林木材积施肥处理的为不施肥的９．８倍．整地施肥还可提高林木叶片的养分含量．     

Sex Structure of Scotch Pine Populations in the Dry Steppe

it has been determined that the sex structure of the population is of great importance for pine adaptation to extreme environmental conditions. As environmental conditions deteriorate, differentiation of populations with respect to sex becomes more apparent, the proportion of trees of mixed type decreases, and the number of male trees increases. A tendency toward correlation between tree habitus, needle and shoot sizes, and the sex structure of population is noted. The prevalence of male trees in populations exposed to increasing stress reflects the rearrangement of such populations aimed at the more efficient use of natural resources.     

试论我国煤矿区生态环境现状及综合整治战略

本文分析了我国煤矿区生态环境现状，并对之进行了分类，指出了当前我国煤矿区生态环境境保护工作中存在的主要问题，提出了我国煤矿区生态环境综合整治战略。     

经济发展中人口城市化与经济增长相关分析比较研究

本文利用OECD国家和世界其他主要国家的人口城市化与经济增长的数据，对人口城市化与经济增长进行了相关分析，以揭示人口城市化与经济增长的关系模式。判断得到我国人口城市化仍处于低增长水平的线性阶段，城市化水平，大大滞后于经济发展水平；大大落后于发达国家同等经济水平时的城市化水平，经济发展与人口城市化的相互促进作用还没有得到充分发挥。为此，文章提出了要加快我国城市化发展，超前于经济的增长是一个理性选择。     

湘中涟源煤盆地煤层气形成气藏的条件及其资源预测

湘中涟源煤盆地早石炭世测水组、晚二叠世龙潭组煤系是中国东南诸省境内最重要的煤系，具有较大的生气、储气能力。本文从煤系的构造热滨化、构造、沉积及煤层理深等方面论述了研究区测水组、龙潭组煤系中煤层气形成气藏的条件，并指出煤层气的开发远景区应该在煤盆地近南缘的诸含煤向斜南西扬起端，其中各主要区域性断裂交汇而成的断块是最重要的靶区。