试论联合国粮农组织推荐的灌溉水质确定表

DISCUSSION ON IRRIGATION WATER QUALITY DETERMINATION TABLE RECOMMENDED BY FAO OF THE UNITED NATIONS

联合国粮农组织推荐的灌溉水质确定表的优产,在于评价灌溉水能否引起土壤碱化时,考虑了土壤的矿物成分,并采用了既反映灌溉水化学成分,又反映灌溉水与土壤相互作用的水质评价参数SAP~*值。本文对它作了详尽分析,并举例说明了SAR~*值的计算方法。为帮助读者理解灌溉水质确定表和使水质评价工作更为简易,还简要介绍了与水质评价有关的几个基本概念,并将灌溉水质确定表作了图解。

The advantages of the irrigation water quality determinatioa table recommended by FAO of the UN are that when it is evaluated whether the irrigation water will cause the alkalization of soil, the mineral ingre-dients of the soil is considered and the water quality evaluation parameter SAR is also used, which shows both the chemical composition of irrigation water and the interaction between the water and soil. This paper makes a detaiied analysis of the table, and also illustrates with examples the methods of calculation of SAR, In order to help readers understand the table and simplify the water appraisal work, the paper not only recommends briefiy a few basic concepts regarding the evaluation of water quality, but also gives an explanation of the table through diagrams.