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近年来,林业的各个专业越来越重视从数量方面对客观事物进行研究。要认识事物,需要了解其多方面的属性,需要考察与之有关的多项因子。例如,用土壤的容量、机械组成、有机质含量、氮磷钾含量、PH值等多项指标来反映土壤的性质;为了说明立地条件,要调查的项目有:地理位置、海拔高度、坡位、坡度、土壤性质和若干气象要素(温度、降水量、光照、湿度、风速等)。又如,反映胶合板的性能,要用到含水
In recent years, various professions in forestry have paid more and more attention to the study of objective things from the aspects of quantity. To understand things, you need to understand its many attributes, you need to examine a number of factors related to it. For example, the properties of soils are reflected by a number of indicators such as soil capacity, mechanical composition, organic matter content, NPK content and PH value. In order to illustrate the site conditions, the items to be investigated are: geographical location, altitude, slope position, Slope, soil properties and several meteorological elements (temperature, precipitation, light, humidity, wind speed, etc.). Another example, reflect the performance of plywood, to use water