ORIGINAL RESEARCH
Changes in the Organic Carbon Content
of Agricultural Soils in the Middle and Lower
Reaches of the Yangtze River in China:
Based on Data from Long-Term
Localization Experiments
More details
Hide details
1
College of Environmental Chemistry and Engineering, Shanghai Electric Power University, Shanghai 200090, Chin
Submission date: 2023-04-24
Final revision date: 2023-06-19
Acceptance date: 2023-06-27
Online publication date: 2023-11-15
Publication date: 2024-01-03
Corresponding author
Luochu Wang
College of Environmental Chemistry and Engineering, Shanghai Electric Power University, Shanghai 200090, Chin
Pol. J. Environ. Stud. 2024;33(1):957-963
KEYWORDS
TOPICS
ABSTRACT
The literature of long−term fertilization experiment in the Yangtze River Economic Belt from 1993
to 2023 was collected, and the data of farmland soil organic carbon were extracted and integrated.
Using the normalization treatment and the analysis method of relative annual variation, the overall
change of soil organic carbon content in farmland in the Yangtze River Economic Belt under long-term
different fertilization measures was studied, and the change differences of soil organic carbon content
under three tillage modes were compared, so as to judge and analyze the influence of the duration
of the experiment on soil organic carbon dynamics. The results showed that under long-term different
fertilization measures, the organic carbon content of farmland soil in the Yangtze River Economic
Belt in China showed an overall upward trend. NP, NPK, O, and NPKO treatments all increased
the organic carbon content of agricultural soils, with the NPKO treatment being the largest. The sole
application of inorganic nitrogen fertilizer reduced the organic carbon content of the soil. The rates
of change in soil organic carbon content were 0.11g·(kg·a)−1, 0.31 g·(kg·a)−1, and 0.30 g·(kg·a)−1
for dryland, paddy and water−dry rotation farmland, respectively. There is some variation in the rate
of change of soil organic carbon content between soil types. The average rate of change of organic
carbon was 0.20 g·(kg·a)−1 for red soils, 0.13 g·(kg·a)−1 for tidal soils and 0.19 g·(kg·a)−1 for rice soils.
The trend of NPKO>O>NPK>NPK>NP>N is basically maintained for the rate of change of soil organic
carbon content. N treatment showed a reduction in organic carbon content in all soil types. Considering
the carbon fixation of farmland soil, the combined application of organic and inorganic fertilizers
is a more suitable fertilization method in this area.