运城盐湖卤水组成变迁史

介绍了运城盐湖卤水组成的变迁过程以及产生这些变迁的原因 ,并对运城盐湖的平衡开采提出了建议。     

Transition and Diversity in Rural Housing Provision: The case of Narrogin,Western Australia

The purpose of this paper is to examine the changing dynamics of housing markets in an Australian rural community. With reference to the case of Narrogin, Western Australia, it argues that there is an increasing disjuncture between the social and demographic characteristics of rural residents and the modal form of housing in country towns, namely the detached family house. Factors contributing to this disjuncture include the ageing of the population, the loss of traditional blue-collar employment, sub-regional restructuring of service provision, retirement migration patterns, and growing acceptance of the particular housing needs of groups such as the aged, the disabled, young and indigenous people. While it is clear that there is currently something of a mismatch between the characteristics of the population and the housing stock in Narrogin, it is also evident that a combination of political, cultural and economic factors form a significant barrier to adjustment in the local housing market.     

深圳市土地利用变化机制分析

利用１９８０、１９８８、１９９４年的遥感影像,通过应用最大似然法和概率松弛法对深圳市土地利用进行了测量。在此基础上,运用分类结果求得研究区土地利用变化的转移矩阵,据此分析了深圳上１５年来土地利用变化的空间过程。结果表明：深圳市土地利用纺要表现为原有农田、果园用地显著减少,城镇用地沿海岸和主要公路干线迅速增加。这一土地利用变化的驱动力主要是深圳经济特区的开放政策、城镇人口迅速增长、外资大量涌入和以房     

Changes and continuity of wood-pastures in the lowland landscape in Czechia

The term wood-pastures is usually applied to areas with trees or other woody vegetation, scattered through a mainly grazed grassland area, and reflects one of the oldest land use types in Europe, which plays important ecological, agricultural and socio-cultural roles. However, a rapid decline in their area due to changes in land use and a lack of tree regeneration has recently been observed all over Europe, which has led to the necessity of a deeper understanding of their behaviour in relation to different factors via a detailed analysis of the history of the changes in their distribution over space and time. Despite the recent increase in the number of related studies, information on historic patterns of wood-pastures in many European locations, such as Czechia, remains incomplete. The goal of this study is to assess the habitat continuity of current wood-pastures and to analyse the land-use/land-cover changes of historical and current wood-pastures in lowlands and warm landscapes of hills and basins of Czechia. To achieve this, nine sites covering a total area of 98.6 km² were studied in Czechia. The situation on three time horizons (1820–1840s, the early 1950s and today) was analysed. The results have shown that almost all wood-pastures from the 1st half of the 19th century have now been lost and most of the currently existing ones were formed from the 1950s till today. Most wood-pastures, which were lost by the 1950s, were turned into open habitats, such as arable lands, and the ones lost from 1950 were turned into forest. New wood-pastures are mostly formed from open habitats, often in former military areas.     

Change Analysis of Three Major Antarctic Ice Shelves Based on Multi-source Remote Sensing Data

In recent years, melting and calving happen in the Antarctic ice shelves. In this paper, seven periods of coastlines were applied to provide an analysis of the ice front changes of Ross, Filchner-Ronne and Amery ice shelves with the inclusion of 1997 and 2000 Radarsat products, 2003/2004 and 2008/2009 MODIS products and 2006, 2012, 2015 coastline which were extracted from MODIS images. Change area, SCE (Shoreline Change Envelope) and NSM (Net Shoreline Movement) were applied to analyze the variation of the ice shelf front. The results shows that, the ice front of Amery ice shelf has advanced since 1997 and the total outward extension distance of the ice front was about 20 to 25 km while the advance area reached 3.03×10³ km². Ross ice shelf and Filchner-Ronne ice shelf continued to advance after ice calving events under the driver action of glacier. However, the advance area was less than the retreat area and the net change area is respectively -9.39×10³ km² and -5.86×10³ km². The retreat distance of the collapse area were up to 53 km and 39 km in the two biggest ice shelves.     

Inter- and intra-annual trend analysis of water level and flow in the middle and lower reaches of the Ganjiang River,China

ABSTRACT

The Ganjiang River is the largest tributary of Poyang Lake in China, and its hydrological regime variation greatly affects the utilization of regional water resources and the ecological environment of the lake. In this study, a novel trend analysis method, the Moving Average over Shifting Horizon (MASH), was applied to investigate the inter- and intra-annual trends of flow and water level from 1976 to 2016 at the Xiajiang and the Waizhou hydrological stations in the Ganjiang River. The Significant Change Rate Method (SCRM) was proposed to determine the MASH averaging parameters. The trend analysis results show a statistically significant decrease in water level series throughout the year and the relationship of flow and water level have changed greatly at the Waizhou station. The sediment load reduction, large-scale sand mining and water level decrease of Poyang Lake are identified as the main causes for the water level decrease.     

动因与机制——对旅游地社会文化环境变迁理论的研究

制约旅游地社会文化环境变迁的动因主要在于外界旅游流对旅游地的静态平衡系统产生冲击和干扰,分析旅游地社会文化环境变迁,必须从构成"流"的要素入手;旅游者及其携带而来的物能流与旅游地各主体要素(政府机构、旅游企业、旅游地原生居民等)的竞争与协调产生旅游地社会文化环境变迁的动力机制.     

川西北早志留世陆源碎屑──碳酸盐混积缓坡

研究区位于扬子地块西北缘，由一套巨厚的页岩、泥岩层夹生物礁及透镜状和不规则层状风暴生屑灰岩、瘤状灰岩组成。根据区内特征的岩石类型及其组合、分布和相应的化石生态，作者认为本区兰多维列期至早温洛克期时为一典型的陆源碎屑－－碳酸盐混积均斜缓坡，并且从浅到深划分为滨岸、浅缓坡、深缓坡及盆地等亚环境。滨岸区位于潮间带，以潮坪碳酸盐岩为代表；浅缓坡位于浪基面至风暴浪基面之间，岩性组合为Ａ、Ｂ类风暴岩，Ａ、Ｂ类瘤状灰岩、生物礁灰岩及粘结岩；深缓坡位于风暴浪基面至最大风暴浪基面之间，岩性以Ｄ、Ｅ类风暴岩、Ｃ类瘤状灰岩及泥页岩组合为特征；盆地处于最大风暴浪基面之下，为黑色泥页岩沉积。结合早志留世时全球冰川作用，文中讨论了海平面变化的原因及对环境的影响。     

土地利用变化的卫星遥感监测——河北省南皮县试验报告

本文报道了运用图像处理技术,分别计算河北省南皮县试区两个不同时相TM与SPOT图像的亮度指数和垂直植被指数,进而求算变化向量、自动输出变化分类图的试验研究结果。经实地对22块变化图斑进行检验,都准确无误,表明从不同时相的卫星图像提取土地利用变化信息,分析耕地消长及大宗作物种植面积波动是完全可能的,有广阔的应用前景。     

黄河上游的阶地与水系变迁

黄河上游于贵德盆地和共和盆地中有７级阶地，再往上游方向存在阶地级数递减的趋势。共和盆地中还有３级古黄河阶地，黄河上游水系是通过一级级河流袭夺相继贯通的，共和盆地与贵德盆地间的黄河古道始于中更新世末期，龙羊峡河段始于６０ｋａ Ｂ．Ｐ．前后，玛多与唐乃亥 间的峡谷河段是２０ｋａ Ｂ．Ｐ．才贯通的。