Method for calculating relative contribution rate of underground soil erosion to ground surface soil erosion in karst area

Abstract

The invention discloses a method for calculating relative contribution rate of underground soil erosion to ground surface soil erosion in a karst area. The method comprises the following steps: a step 1: selection of monitoring objects: reservoirs or ponds, underground rivers or different land types in the karst area are selected as monitoring objects; a step 2: monitoring objects are sampled; a step 3: 137Cs content of each sampled sample is determined; a step 4: measured values of 137Cs content in the samples are used for calculating the relative contribution rate of soil surface soil erosion to underground soil erosion. The method solves the technical problem in the prior art that a radionuclide tracer method cannot be used in karst slope due to discontinuous regolith space distribution, high bareness rate of bedrocks, existence of slip soil, and severe underground soil erosion; and solves the technical problems that middle and long term average soil erosion rate cannot be accurately estimated only by short time determination due to limited test data of traditional soil erosion monitoring methods, and back analysis and description of the relation between stony desertification and soil erosion are difficult, and the like.

Description

technical field [0001] The invention belongs to the water and soil loss monitoring technology in the karst area, in particular to a method for calculating the relative contribution rate of the underground and surface water and soil loss in the karst area. Background technique [0002] Traditional methods of monitoring soil water and soil loss or soil erosion: There are hydrological station observation methods, but this observation method requires a long investment and time, and the measured data can only reflect the erosion and sediment production status of the entire watershed, and cannot obtain different landform units in the watershed. or the amount of erosion on the land use type; the pin piling method is easily affected by farming activities, and the annual erosion is generally only a few millimeters, with large errors; the runoff plot method is time-consuming and requires a lot of manpower and material investment The erosion amount of the entire slope can be obtained, ...

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Problems solved by technology

[0003] The technical problem to be solved by the present invention is to provide a method for calculating the relative contribution rate of underground and surface water and soil loss in karst areas, so as to solve the problems in the prior art due to the discontinuous distribution of soil cover in karst areas, the high exposed rate of bedrock, and the existence of soil It is difficult to apply radionuclide tracer method to karst slopes; the traditional soil erosion monitoring method has limited test data, and it is difficult to accurately estimate the medium and long-term average soil erosion rate only through short-term measurement. and technical issues such as describing the relationship between rocky desertification and soil erosion

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