Correlation Between Soil Organic Matter,Total Nitrogen and Soil Carbon Emissions and Their Estimation Model
[Objective]It aimed to investigate the effects of soil organic matter and total nitrogen on soil carbon emissions and to analyze the feasibility of estimating carbon emission models,which provided reference for soil carbon sequestration and emission reduction,as well as for creating a simple,easy-to-follow,and universally applicable methods for soil carbon emission assessment.[Method]Using a combination of field experiments and model fitting,the effect of different soil fertility levels[OL:organic matter at 41.0 g/kg,total nitrogen at 2.1 g/kg(level 1 fertility);SL:organic matter at 31.0 g/kg and total nitrogen at 1.6 g/kg(level 2 fertility);TL:organic matter at 21.0 g/kg and total nitrogen at 1.1 g/kg(level 3 fertility);FOL:organic matter at 11.0 g/kg and total nitrogen at 0.8 g/kg(level 4 fertility);FIL:organic matter at 9.0 g/kg and total nitrogen at 0.6 g/kg(level 5 fertility)]on soil carbon emissions were studied by using soil organic matter at 9 g/kg and total nitrogen at 0.4 g/kg(5-6 levels of fertility)as CK.Then the accuracy and applicability of fitting models with organic matter and total nitrogen content as factors for estimating soil carbon emissions were analyzed.[Result]When the soil fertility level was level 1,there were negative correlation between soil carbon emissions and organic matter together with total nitrogen content;When the soil fertility level was level 2,the soil carbon emissions reached a peak of 4 320.22 kg/hm2,which was significantly increased by 88.81%compared to CK;When the soil fertility level were 3-6 levels,there were positive correlation between soil carbon emissions and organic matter and total nitrogen content.[Conclusion]The are correlation between soil carbon emissions and organic matter together with total nitrogen content to a certain degree.The fitting formula among soil organic matter content(x),total nitrogen content(y),and soil carbon emissions(CE)is CE=2 221.37-263.15x+6 174.45y.This model has good predictability and accuracy,and can be used to estimate regional soil carbon emissions based on soil fertility levels.
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