Environmental problems in coastal zone of Chin──sea-level rise and groundwater table decline

Foundationitem:UndertheauspicesoftheKeyProjectoftheChineseAcademyofSciences(KZ951-Al-203)1IntroductionTherearellcoastalprovincesandprovince-levelmwhcipalihesinChina,excludingTaiwan,HongKong,andallcao,withl8OOodri-longcoastallines(FigUrl).Thisregionisaneconondodly-develoPedanddensely-populatedzonewithalandareaofl3.8%ofthenahon'stOtal,55.6%ofitSgrossdomesticproducLnd39-8%,PfitSPOPulationinl997.Thepopulallondensityis4.4hmesthaofthetalonalaverage.The299cihesinthesellcoastalprovincesare4…     

长江上游滇东北山区坡耕地水土流失与可持续利用研究简介

介绍了“滇东北山区坡耕地水土流失与可持续利用研究”的研究的思路、内容和方法,以及所取得的研究成果。     

中国土地利用程度的区域分异规律模拟研究

在前人提出的土地利用程度地综合指数计算方法和指标体系基础上,应用地统计学方法模拟了我国土地利用程度的区域分异规律,结果表明,我国土地利用程度与经度和海拔之间存在一定的经向区域分异规律,地统计学“Ｋｒｉｇｅ”内插技术模拟的回归优度达９９．９９％,明显优于二元线性回归模型的模拟效果,能更真实反映我国土地利用程度的区域分异规律,从而为我国土地利用程度时空分布的模拟与预测提供可靠方法。     

遥感技术在山区土地荒漠化评价中的应用--以东川市为例

通过遥感数字图像统计分析与处理,确定了分类图,沟谷图,绿度指数图是评价山区土地荒漠化的有效图象,进行了沟谷指标,绿度指数分级,肯定了遥感技术应用于山区土地荒漠化评价的可能性。     

滇东北山区坡耕地水土流失与可持续利用图的基本内容与编制方法

坡耕地水土流失与可持续利用图是综合表示滇东北山区各个坡耕地单元的水土流失状况及其可持续利用的专题地图。该图表示的基本内容是坡耕地类型、土壤类型、坡度级别、侵蚀强度、可持续利用程度、合理利用方向与措施。以土壤流失方程为基础,应用地理信息系统编制了该图。该图的编制为治理本区坡耕地水土流失、合理利用坡耕地资源提供了科学依据。     

滇东北山区坡耕地土壤侵蚀的地形因子

通过在滇东北山区坡耕地上设置１８个不同坡度和坡长的试验小区,并进行连续３年实测,得到本区域土壤侵蚀地形因子（ＬＳ）的定量关系式,据此求得滇东北山区坡耕地土壤侵蚀的坡面地形效应（ＬＳ值）表。     

滇东北山区坡耕地土壤侵蚀的作物经营因子

通过建立滇东北山区４种代表性作物种植类型———玉米、马铃薯、黄豆、玉米－黄豆间作对降雨引起土壤侵蚀的影响试验小区并进行连续３年实测,分析确定了作物经营因子（Ｃ）值,为建立坡耕地土壤流失方程、进行土壤侵蚀预测预报、制定水土保持农业措施奠定了基础依据     

滇东北山区土地资源开发利用战略Ⅰ.土地资源特点、利用现状及潜力

分析了本区土地资源的基本特点、利用现状、存在问题及土地开发利用潜力。     

影响坡地降雨产流历时的因子分析

运用小型野外便携式人工模拟降雨装置研究了林地、农地、裸地诸因子（坡度、承雨强度、土壤始含水率、林地植被盖度、枯落层厚度）对产流历时的影响。研究发现,林地影响产流历时的主要因子为承雨强度和植被盖度;农地、裸地则为承雨强度、坡度和土壤初始含水率。建立了不同土地利用方式下影响产流历时的单因子、多因子回归方程。通过方程,由植被盖度、坡度、土壤初始含水率和承雨强度四个易于获得的因子可预测不同土地利用方式下的     

Application of Mineral Exploration Models and GIS to Generate Mineral Potential Maps as Input for Optimum Land-Use Planning in the Philippines

The inherent problems of classifying or inventorying potential mineral resources (as opposed to known mineral resources) pose specific challenges. In this paper, the application of a conceptual mineral exploration model and GIS to generate mineral potential maps as input to land-use policy decision-making is illustrated. We implement the criteria provided by a conceptual exploration model for nickeliferous-laterites by using a GIS to classify the nickeliferous-laterite potential of an area in the northeastern part of the Philippines. The spatial data inputs to the GIS are geological map data, topographic map data, and stream sediment point data. Processing of these data yields derivative maps, which are used as indicators of nickeliferous-laterite potential. The indicator maps then are integrated to furnish a nickeliferous-laterite potential map. This map is compared with present land-use classification and policy in the area. The results indicate high potential for nickeliferous-laterite occurrence in the area, but the zones of potential are in places where mineral resources development is prohibited. The prohibition was imposed before the nickeliferous-laterite potential was assessed by this study. Mineral potential classification therefore is a critical input to land-use policy-making so that prospective land is not alienated from future mineral resource development.