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Abstract

Three collectives of substances - plastics, plant nutrients, biotoxins - are candidates for monitoring programmes that could keep track of the quality of ocean waters for vital life processes. All three are not subject to systematic surveillance at present. They are each characterized by long residence times in the marine environment, by increasing influx, and by growing evidence of their deleterious impacts on living systems.     

利用微机制作土壤环境研究中的趋势面等值线图

介绍一种利用微机制作土壤环境元素含量趋势面等值线图的实用方法，其中包括地理背景底图，趋势面等值线图及两图的套绘技术。本法简便易操作勿需复杂的硬，软件支撑，利用普遍流行的常用软件，不但能进行趋势面分析及绘图中所需的坐标转换，耐用可解决图件套绘中的定位问题，对拥有微机和小型绘图仪的单位均可适用。