Test method for determining property changes and erosion effect of topsoil

Abstract

The invention relates to a test method for determining property changes and an erosion effect of topsoil. A typical soil type test slope surface in a research area is selected, drying treatment and wetting treatment are alternatively conducted on test soil the same times, physicochemical property indexes of the soil are measured after drying treatment is conducted on the test soil each time, and then wetting treatment is conducted at once to measure the erosion amount of the soil; the test slop surface is an in-situ area of which surface vegetation is pruned, and the moisture content of the initial test soil reaches the highest field capacity; drying treatment and wetting treatment are alternatively conducted on the in-situ area not less than three times; manual water filling is adopted in wetting treatment to reach the highest field capacity; in drying treatment, the soil is naturally exposed in the sun under the temperature threshold condition of 25 DEG C to 35 DEG C, and the moisture content of the soil is made to reach a wilting coefficient by combining a soil temperature and moisture control system air cooler and a vertical air duct part. The test method is reasonable in design, the property changes and the erosion effect of the slop surface topsoil under the drying and wetting alternation condition can be determined, and the important significance on verification of the water and soil imbalance process mechanism under the influences of a changing environment is achieved.

Description

technical field [0001] The invention belongs to environmental ecological test methods, in particular to a test method and a test system for measuring surface soil property changes and erosion effects. Background technique [0002] Drought and extreme precipitation and other climate phenomena occur frequently, directly affecting the temporal and spatial distribution of rainfall, evaporation, and runoff, changing the status quo of the global hydrological cycle, exacerbating changes in soil moisture content, and causing frequent occurrences of alternating wet and dry soils. The alternation of soil wetting and drying is a process with large short-term variation in the thermodynamics and hydrology of the soil system, which can change the physical and chemical properties of the soil to a certain extent; The change of soil volume and the development of cracks, and affect the mineralization of soil nitrogen, the adsorption and release of phosphorus and other processes. [0003] Soi...

AI Technical Summary

Problems solved by technology

The existing technology is to conduct soil property tests under indoor simulated dry and wet alternating conditions. Due to the deviation between the simulated control of indoor environmental factors and the environmental changes under natural conditions, it is sometimes difficult to compare the obtained research results with the parameter changes measured in the field. Good coupling analysis limits the effect of research on soil erosion mechanism; and it also fails to study in depth the entire process from "changes in solar radiation, alternating changes in soil dryness and wetness - changes in soil moisture temperature - changes in soil properties - changes in erosion effects". Mechanism of the process

Images