Experimental method for researching response of mulching film degradation characteristics to moisture conditions

Abstract

The invention discloses an experimental method for researching the response of mulching film degradation characteristics to moisture conditions. The method comprises the following steps: (1) sample culture: burying a sample mulching film into soil of each experimental group with different moisture contents; (2) sample collection; (3) sample determination: determining the degradation rate of the mulching film, the surface structure of the mulching film, the chemical structure of the mulching film, soil microbial biomass carbon, nitrogen, soil enzyme activity and the like; and (4) result analysis. According to the invention, a landfill culture test of the mulching film is carried out; the degradation time and the degradation degree of different PBAT biodegradable mulching films are analyzed;the degradation characteristics of the PBAT biodegradable mulching film under different soil moisture conditions are researched by combining scanning electron microscope (SEM) and Fourier transform infrared spectroscopy (FTIR) analysis, the influence of the PBAT biodegradable mulching film on soil microorganisms and enzyme activity is discussed, a mulching film degradation evaluation method is established, and a theoretical basis is provided for the popularization and application of the biodegradable mulching film.

Description

technical field [0001] The invention relates to an experimental method for studying the response of plastic film degradation characteristics to water conditions, and belongs to the technical field of plastic film performance research. Background technique [0002] Since the introduction of mulching film in 1970, mulching film has greatly changed and affected agricultural production methods and farmland planting structures. In 1986, the domestic use of mulch film reached the first place in the world. In 2018, the use amount exceeded 1.5 million tons, ranking first in the world. However, after the traditional plastic mulch is mechanically damaged, it will exist in the environment in the form of fragments. With the extension of the covering time, the residual amount of the mulch gradually increases and gradually migrates to the deep soil. After a long-term investigation, Chen Jing and others found that when the mulching period is short, 71.8% of the residual film is distribute...

AI Technical Summary

Problems solved by technology

However, the degradation characteristics and environmental impact factors of mulch film are still unclear, and there is a lack of effective evaluation methods, which greatly restricts the research and development, production and wide application of degradable mulch film technology.

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