Fertilization increases paddy soil organic carbon density |
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| Authors: | Shao-xian Wang Xin-qiang Liang Qi-xiang Luo Fang Fan Ying-xu Chen Zu-zhang Li Huo-xi Sun Tian-fang Dai Jun-nan Wan and Xiao-jun Li |
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| Institution: | 1Institute of Environmental Science and Technology, College of Environmental and Resource Sciences, Zhejiang University, Hangzhou 310029, China;2Jiangxi Academy of Agricultural Sciences (National Engineering Research Centre for Improving Red Soil in China), Nanchang 330200, China;3Jiangxi Science and Technology Normal University, Nanchang 330045, China;4Agricultural Bureau of Qingyuan of Ji''an of Jiangxi Province, Ji''an 343009, China |
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| Abstract: | Field experiments provide an opportunity to study the effects of fertilization on soil organic carbon (SOC) sequestration.
We sampled soils from a long-term (25 years) paddy experiment in subtropical China. The experiment included eight treatments:
(1) check, (2) PK, (3) NP, (4) NK, (5) NPK, (6) 7F:3M (N, P, K inorganic fertilizers+30% organic N), (7) 5F:5M (N, P, K inorganic
fertilizers+50% organic N), (8) 3F:7M (N, P, K inorganic fertilizers+70% organic N). Fertilization increased SOC content in
the plow layers compared to the non-fertilized check treatment. The SOC density in the top 100 cm of soil ranged from 73.12
to 91.36 Mg/ha. The SOC densities of all fertilizer treatments were greater than that of the check. Those treatments that
combined inorganic fertilizers and organic amendments had greater SOC densities than those receiving only inorganic fertilizers.
The SOC density was closely correlated to the sum of the soil carbon converted from organic amendments and rice residues.
Carbon sequestration in paddy soils could be achieved by balanced and combined fertilization. Fertilization combining both
inorganic fertilizers and organic amendments is an effective sustainable practice to sequestrate SOC. |
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| Keywords: | Soil organic carbon (SOC) SOC density Long-term fertilization Paddy soil |
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