The soil quality in the black soil area is mainly reflected in the organic matter content. Through the study of soil organic matter change in the black soil region of Northeast China from 1980 to 2010, it is found that soil organic carbon and grain yield are positively correlated to a certain extent. In the past 30 years, the density and carbon storage of the surface soil of 0~20cm or 1m depth showed a decreasing trend, that is, the output of soil organic carbon was greater than the input, and the soil organic carbon was in an unbalanced state.
Soil properties have a direct impact on the organic carbon balance. The climate environment and human management affect the soil organic carbon balance through soil properties, and the climate and environmental impacts are greater than human management.
From the perspective of regional soil organic matter upgrading or fertilization, it is necessary to determine the goal of upgrading or fertilizing through the factors affecting the balance of organic carbon, that is, the equilibrium point of soil organic carbon, thereby guiding the fertilization or carbon sequestration.
It is estimated that the potential balance point of organic carbon in the black soil area in Northeast China is 43.05g/kg, the average in the middle fertilizer area can be increased by 10.60g/kg, and the average in the low-fertilizer area can be increased by 22.16g/kg. This helps to grasp the amount of organic fertilizer applied and the amount of straw returned to the field, thus promoting the development of organic carbon balance to a more optimal direction.
This article URL: Identify the organic carbon balance point to grasp the amount of organic fertilizer application
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