Method for determining carbon content of sandy soil

Abstract

The invention discloses a method for determining the carbon content of sandy soil. The method includes the following steps: (1) collecting a fresh sample on a soil surface layer and a soil cross section, air-drying, then removing debris, and allowing the sample to pass through a soil sieve; (2) according to soil properties, weighing a proper amount of sample correspondingly; (3) mixing the weighed soil sample with a KMnO4 solution, and carrying out shock centrifugal treatment; (4) taking a proper amount of the supernatant after centrifugal treatment, and diluting and making the volume constant; (5) measuring the absorbance of the solution after dilution and constant volume realizing by an ultraviolet spectrophotometer; (6) preparing a plurality of KMnO4 solutions with different concentrations, measuring the absorbance with the same ultraviolet spectrophotometer respectively, and drawing a standard curve between the concentration and the absorbance; and (7) according to the standard curve, calculating to obtain the consumption amount of KMnO4, and then calculating to obtain the percentage of organic carbon. The determination of the organic carbon content in the soil is relatively accurate, a reference and a basis are provided for study on global climate change and regional agricultural development, and a role in promoting the development of agriculture and environment is played.

Description

technical field [0001] The invention belongs to the technical field of environmental monitoring and relates to a method for measuring the carbon content of sandy soil. Background technique [0002] The content of organic carbon in soil plays an important role in the maintenance of soil quality and the improvement of soil fertility, and its dynamic changes can provide reference and basis for the study of global climate change and the development of regional agriculture. Soil organic carbon is composed of a variety of compounds with different properties, different molecular structures, and different decomposition and transformation rates. Therefore, understanding and mastering the content changes of soil organic carbon and its components has great impact on the development of agriculture and the environmental problems caused by it. Has a driving effect. [0003] The determination of active organic carbon and inactive organic carbon in soil organic carbon has always been a res...

AI Technical Summary

Problems solved by technology

However, due to different soil types, soil textures, and organic carbon content, the determination method of soil active organic carbon content cannot be unified during the determination process.

Due to the low content of active organic carbon, there are problems such as inaccurate or undetectable measurement results

For soils with low organic carbon content and high sand content in the soil texture, the determination process is difficult to control, and the experimental results are even more inaccurate; due to the different particle sizes and sample volumes, the soil total organic carbon, activity Increased error between organic carbon and non-reactive organic carbon content

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