天山中部北麓丘陵地带土壤发生特性与系统分类

通过样地调查与土壤理化性质分析相结合对天山中部北麓丘陵地带的土壤特性进行研究,确定各剖面的诊断层和诊断特性及其在系统分类中的位置。结果表明天山中部北麓丘陵地带在系统分类中可划归为3个土纲4个土类;系统分类中土壤的分类位置与发生分类位置并不具有简单的一一对应的关系。     

东昆仑埃坑地区磷灰石裂变径迹年代学及构造意义

东昆仑位于青藏高原北部，埃坑地区处在东昆仑昆中和昆南断裂带之间。通过对该区域5个磷灰石样品分析，获得其裂变径迹年龄分别为（99±10）、（103±9）、（80±6）、（98±6）、（65±5） Ma。埃坑地区热历史可分为3个阶段：第1阶段（160~58 Ma）持续隆升，对应羌塘地块与拉萨地块向欧亚板块的拼贴作用；第2阶段（58~35 Ma）快速隆升，印度板块与欧亚板块碰撞导致埃坑强烈隆起；第3阶段（35 Ma至今），构造活动较弱，未受青藏高原新近纪以来热事件影响。该地区5个样品的隆升量分别为3374、3283、3230、3157、3278 m，平均隆升量为3264 m，平均隆升速率为0.038 mm/a。     

Analysis of the Difference between Surface Area and Vertical Projection Area on Shaanxi Qinling Mountains based on DEM

Based on DEM of Qinling Mountains, used the model of the center cell and the adjacent eight cells, we calculated the surface area of Shaanxi section Qinling Mountains. The results shows that: (1) The surface area of Shaanxi section Qinling Mountains is 75 224.67 km², which is an increase of 22.04% from the vertical projection area；（2）The relation between the difference of surface area and vertical projection area and elevation is parabolic. The altitude of 2 000 meters is the area with the largest difference between the surface area and the vertical projection area in Shaanxi section Qinling mountains；（3）Compared with the vertical projection area, the area of low mountains, medium mountains and submountains in Shaanxi section of the Qinling mountains increased by 2 301.54 km², 6 181.67 km² and 691.60 km² respectively, with the growth rate of 10.68%, 18.37% and 18.25% respectively.（4）The difference between the surface area and the vertical projection area is various in different land use types. Not using land is the largest, the difference is 34%. The second is forest land which the difference is 28%, and the lawn is approximately 20%. Difference is small in farmland, other forest land, water and residents and industrial land, which is 12%, 8%, 5% and 8% in turn.     

pH and Acid Anion Time Trends in Different Elevation Ranges in the Great Smoky Mountains National Park

Quarterly base flow water quality data collected from October, 1993 to November, 2002 at 90 stream sites in the Great Smoky Mountains National Park were used in step-wise multiple linear regression models to analyze pH, acid neutralizing capacity (ANC), and sulfate and nitrate long-term time trends. The potential predictor variables included cumulative Julian day, seasonality, elevation, basin slope, stream order, precipitation, surrogate streamflows, geology, and acid depositional fluxes. Modeling revealed statistically significant decreasing trends in pH and sulfate with time at lower elevations, but generally no long-term time trends in stream nitrate or ANC. The best forecasting models were chosen based on maximizing the r2 of a holdout data set. If conditions remain the same and past trends continue, the forecasting models suggest that 30.0% of the sampling sites will reach pH values less than 6.0 in less than 10?years, 63.3% in less than 25?years, and 96.7% in less than 50?years. The pH forecasting models explain 65% of the variability in the holdout data.     

山水交融,生态校园——湖南潇湘技师学院新校区方案设计

该文通过对湖南潇湘技师学院新校区规划设计方案的分析介绍,阐述了校园建筑应以人为本,与生态环境相融合。同时为现代新校园的设计提出创造性的理念。     

青海丁叉叉山地区金红石矿床地质特征及找矿前景

丁叉叉山地区金红石矿床位于柴北缘成矿带东端,为近年新发现的大型金红石矿床。矿床产于古元古界金水口群地层榴辉岩体中,严格受榴辉岩体的控制。呈条带状、透镜状产出,近东西向展布。成因类型属榴辉岩型金红石矿床,成矿时期为加里东期。在总结区内矿床地质特征的基础上,进而与国内苏鲁榴辉岩金红石矿床、省内鱼卡榴辉岩型金红石矿床等典型矿床对比分析,研究表明:区内榴辉岩成矿条件有利,保存条件良好,具有较好的找矿前景。     

太行山石湖金矿成矿流体成分特征与演化过程

成矿流体的研究是矿床成因研究的一个非常重要的方面。本文通过石湖金矿流体包裹体的激光拉曼分析和包裹体群体分析,气相成分中发现了大量的含CO2 包裹体,可能产生碳-水反应使其在主成矿期成矿;液相成分显示了成矿流体为以岩浆热液为主同时含有大气降水的混合流体,成矿过程主体为还原环境,后期也有O2的参与使环境转换为半封闭环境甚至是开放环境,而金在成矿流体中主要以硫氢络合物的形式迁移,氯络合物次之。     

大秦岭西安段生态环境保护规划探析

秦岭的生态环境保护具有重要的现实意义。规划以生态环境保护为纲、以实现城乡统筹为领,以促进生态安全为重、以适宜人居休闲为本,以"保一山碧绿、护八水长流"为目标,对大秦岭西安段的生态环境保护进行总体规划布局,构筑由山体保护规划、森林生态系统保护规划和水土保持规划等多项规划组成的保护体系,强化大秦岭西安段的生态环境保护、水资源保护与文化资源保护,并借助秦岭丰富的山水景观、历史遗存和宗教文化等旅游资源,强化旅游文化产业板块的建设,强化保护与发展之间的有效衔接,充分展示"山水秦岭、人文西安"的独特魅力,促进了区域生态环境的良性循环和健康发展。     

城市山水边缘地区生态景观规划设计探讨——以新余市仰天岗南部地区为例

城市山水边缘地区是城市生态景观建设的重要地区。新余市仰天岗南部地区景观规划设计在秉承山水环境保护的基础上,利用生态学中边缘效应,以格局、结构、要素和手法为景观规划设计的核心内容,建立一种人与自然和谐的理想山水景观模式。     

基于生物多样性保育的山区乡村生态振兴模式探索 ——以武陵山区桥头镇为例

山区高环境空间异质性对于生物多样 性维持具有重要支撑作用,生物多样性是乡村 绿色发展的重要基础资源。生态振兴是山区乡 村振兴的重要发展方向,其中生物多样性保育与 可持续利用已成为乡村生态振兴的重要途径。西 南武陵山区是中国生物多样性热点区域,丰富而 独特的生物多样性为武陵山区乡村生态振兴奠 定了良好基础。本文以地处武陵山区的重庆市 石柱县桥头镇为例,基于其“林—草—湿”一体 化的优良生态本底和丰富独特的山地生物多样 性资源,针对山区立体环境特征、生态资源禀赋 和生物多样性现状,在探讨其山地生物多样性 特征的基础上,提出了基于生物多样性保育的乡村生态振兴目标、策略及模式,为山地区域从多空间维度、多时空尺度、多产业层次实现乡村生态 振兴提供借鉴。