[1]YOU Junjian,XIE Kaixuan,SUN Lei,et al.Influence of Sewage Sludge Biochar Application on Mineralization of Organic Carbon of Sandy Soil in the Yudong Plain[J].Research of Soil and Water Conservation,2019,26(06):12-17.
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Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume:
26
Number of periods:
2019 06
Page number:
12-17
Column:
Public date:
2019-10-17
- Title:
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Influence of Sewage Sludge Biochar Application on Mineralization of Organic Carbon of Sandy Soil in the Yudong Plain
- Author(s):
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YOU Junjian1, XIE Kaixuan1, SUN Lei1, LIU Xia1, HU Xuli2, SU Xinyu1, WU Wei2
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1. Jiangsu Key Laboratory of Soil and Water Conservation and Ecological Restoration/Southern Modern Forestry Collaborative Innovation Center, College of Forestry, Nanjing Forestry University, Nanjing 210037, China;
2. Branch of Soil and Water Conservation, Huaihe River Commission, Ministry of Water Resources, Bengbu, Anhui 233001, China
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- Keywords:
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Yudong Plain; sandy soil; sewage sludge biochar; organic carbon mineralization
- CLC:
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S156.5
- DOI:
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- Abstract:
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In order to explore the effects of biochar on peanut yield, soil organic carbon and carbon mineralization dynamics, a field experiment was conducted. The experiment included 5 different treatments:biochar rates at 20 t/hm2 (B20), 40 t/hm2 (B40) and 60 t/hm2 (B60), inorganic fertilizers (NPK), the control (CK). The organic carbon mineralization was measured under the laboratory soil incubation experiment on the basis of the theory of soil organic carbon. The results showed that:(1) different application rates of biochar could significantly increase peanut yield and soil organic carbon by 21.30%, 51.88%, 41.06% and 18.30%, 21.84%, 29.62%, respectively; (2) the changes of soil organic carbon mineralization rate of each treatment followed the logarithmic relationship; the mineralization rate of soil organic carbon in each treatment increased first at the initial stage of incubation, then decreased rapidly and stabilized finally; after 49 days of incubation, the highest cumulative CO2 emission occurred in the NPK treatment (645.50 mg/kg), followed by B40 (449.53 mg/kg) and B60 (401.33 mg/kg); (3) the dynamics of SOC mineralization preferably followed the first order kinetics, the values of both Cp and k of all treatments were high, Cp ranged from 0.26 g/kg to 0.66 g/kg, and k ranged from 0.008 6 to 0.013 4 per day; compared with CK treatment, the soil organic carbon mineralization rates of B40, B60 and NPK treatment significantly increased (55.93%~150.37%). The above results indicated that the application of biochar to sandy soil in Yudong Plain could increase soil organic carbon, decrease cumulative CO2 emission and mineralization rate of soil organic carbon, and enhance soil carbon fixation capacity. This study can provide the scientific basis for improving soil carbon pool and the utilization of sewage sludge.