Adaptation of Nitraria sphaerocarpa to wind-blown sand environments at the edge of a desert oasis

This study addresses the adaptation of Nitraria sphaervcarpa to blown sand at the edge of a desert oasis with regard to the aspects of soil seed banks, seedlings, and population. Horizontally, the total number of seeds per unit area decreased from the shrub canopy center to intershrub areas, and most seeds were found under shrub canopies. Vertically, the highest proportion of seeds was found at depths of 5-10 cm. The emergence percentage, seedling mass, and seedling height, which were significantly affected by both burial depth and seed size, were highest at the optimal burial depth of 2 cm, and decreased with increasing burial depth in each seed size-class. Although seedling mass was usually greatest for large seeds and least for small seeds at each burial depth, little difference was observed in seedling height at shallow burial depths of 0-3 cm. The population shows a patchy and discontinuous distribution pattern. Population height increases with increasing sand depth. Also the density increases with increasing depth of sand in the desert; however, there is a steady decrease when the depth of sand is more than 100 cm. This result indicates that the depth of sand that is most suitable for the growth of Nitraria sphaervcarpa is 100 cm. The size of the population is significantly correlated with the sand depth, which increases with increasing depth in the desert.     

中国风蚀区扶贫移民主体差异性及其效应研究——以陕西定边县马沟泉村为例

在实地调研的基础上,运用迁移差别指数对马沟泉村移民主体的家庭贫富、家庭规模、职业、年龄、受教育程度等进行了分析,研究表明:家庭富裕和规模大、有固定职业、年龄在0~14岁和60岁、受教育程度高的移民主体迁移差别指数高,更倾向于迁移。同时探讨了移民主体差异性对移民效应的不同影响,结果表明:家庭规模越大越容易摆脱贫困;从业种类越多的家庭、富裕的家庭收入越多,移民效果更好。     

对晋冀鲁豫接壤区一些环境经济政策的思考

对晋冀鲁豫接壤区一些环境经济政策的思考中科院生态环境研究中心李洪伟我随中科院经济、环境考察组对晋冀鲁豫接壤区的区域发展状况，进行了为期一个多月的考察。此区域地处中原腹地，可谓中国的“中部之中部”，其发展对于促进中部，带动西部相当重要，在考察过程中，觉...     

煤矿区景观生态环境价格指标体系的探讨

“破坏性建设”是煤矿区面临的严重问题，应采取适当的生态环境政策与评价分析，来规划、设计、建筑煤矿区的景观生态环境。     

循环经济与生态园区建设

本文分析了循环经济与建设生态园区的内在机理与特征，指出了生态园区是实现循环经济的有效载体，并提出了我国发展循环经济，建设生态园区的措施与建议。     

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。     

关于强化港口化工区环境风险防范的思考

针对港口化工区的特点，分析了存在的隐患及风险，结合工作实际，提出了防范环境风险的对策及建议。     

下扬子区早石炭世佩尔特(Pelto)D函数图和熵图及其研究意义

以下扬子区44个代表性剖面的资料为基础,求导佩尔特提出的D函数和熵函数,编制出早石炭世各时期的沉积厚度趋势图和佩尔特岩相图,研究其沉积特征和古地理,对阐明该区地质发展史和地层控矿条件提供空间分布上的有用信息。     

煤矿区资源开发与生态保护指标体系的建立

以煤炭资源开发对矿区生态环境的污染和破坏现状为基础，以实现煤矿区可持续发展为目标，论述煤矿区资源开发与生态保护指标体系建立的指导思想、基本原则、基本要求及主要的指标类型，以及指标体系的建立对实现煤矿区可持续发展的意义。     

试论采煤塌陷土地的可持续利用

可持续发展是我国今后进行社会主义现代化建设的主要战略。本文在分析我国采煤塌陷土地开发利用现状的基础上，提出了采煤塌陷土地可持续的含义，目标以及主要措施和对策。