Novel method for drought evaluation of automatic soil moisture observation station

Abstract

The invention discloses a novel method for drought evaluation of an automatic soil moisture observation station, relating to the technical field of soil drought evaluation. The method is mainly characterized in that two soil moisture physical constants such as soil field water-holding capacity and wilting moisture are adopted, and the relative soil wilting moisture of multiple soil moisture observation stations is calculated; the relative soil wilting moisture is taken as the lower limit of three types of soil moisture content, the relative humidity of 100 percent is taken as the upper limit of a type of soil moisture content, and the novel evaluation standard of the soil moisture content grades of the types I, II and III can be determined by using (the relative humidity 100 percent of the field water-holding capacity-the relative soil wilting moisture)/3 equal interval division. According to the method disclosed by the invention, the regional agriculture drought grade standard is determined in drought evaluation of the regional soil moisture automatic station, and the standard is more accurate than the general standard. On the basis of the general standard, the single-station single-standard drought grade evaluation mode is realized.

Description

technical field [0001] The invention relates to the technical field of soil drought assessment, in particular to a new drought assessment method for an automatic soil moisture observation station. Background technique [0002] At present, the agricultural drought assessment in terms of soil moisture is based on the relative soil humidity to divide a certain interval for regional drought assessment. Including the current national agricultural drought grade standards are judged and evaluated based on the level of relative soil humidity. The defect is that if the user does not make appropriate adjustments to the grade division according to the specific conditions of the local soil properties, it is difficult to reflect the relative humidity of the same soil. Humidity varies from region to region. [0003] The existing drought assessment standards only consider the field water holding capacity of soil (the upper limit of effective water is 100%), but ignore the problem that the...

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Problems solved by technology

[0004] The disadvantage of the existing national standard is that it only considers the upper limit of effective water and does not consider the lower limit of effective water. In this way, there is an error in the application of the unified standard at the site. It only pays attention to how much soil moisture accounts for the upper limit of effective water, and does not take into account the lower limit of effective water. distance difference