ACTA AGRICULTURAE BOREALI-SINICA ›› 2019, Vol. 34 ›› Issue (S1): 168-175. doi: 10.7668/hbnxb.20190635

Special Issue: Soil fertilizer

• Resource and Environment·Plant Protection • Previous Articles     Next Articles

Soil Organic Carbon Sequestration under Long Term Fertilization Practices in Fluvo-Aquic Soil of North China Plain

HUANG Shaohui1,2, YANG Junfang1, YANG Yunma1, XING Suli1, HAN Baowen1, LIU Mengchao1, HE Ping2, JIA Liangliang1   

  1. 1. Institute of Agro-Resources&Environment, Hebei Academy of Agriculture and Forestry Sciences, Shijiazhuang 050051, China;
    2. Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Beijing 100081, China
  • Received:2019-08-17 Published:2019-12-28

Abstract: Understanding the effects of wheat straw returning and fertilization on the evolution of soil organic carbon(SOC) in in fluvo-aquic soil can be beneficial to soil fertility and crop yield in North China Plain. A long-term fertilization experiment was established from 1992 to 2014 in Malan town, Xinji city, Hebei Province. There were four treatments in this experiment(NP: No potassium and no straw returning; NPK: Balanced fertilization and no straw returning; NPS: No potassium and wheat straw returning; NPKS: Balanced fertilization and wheat straw returning). We explored the relationship between SOC and fertilization years, carbon inputs and carbon balance. The results showed that SOMs in 0-20 cm layer increased with the fertilization year in all treatments. And the increasing rate were 0.06, 0.17, 0.25, 0.34 g/(kg · a) in NP,NPK,NPS,NPKS, respectively. After 22 years, the soil organic carbon storage in each treatment increased by 2.2, 6.2, 5.9, 8.9 t/ha, respectively, and the carbon sequestration rates were 0.10, 0.28, 0.27, 0.40 t/(ha · a).Moreover, there was a linear correlation between the change of soil organic carbon storage and the cumulative carbon input. When the wheat straw was returned to the field, the cumulative carbon input to maintain the initial organic carbon level was 2.65 t/ha, and the carbon sequestration efficiency(CSE) was 9.1%. The minimum SOC contents to support the stable and high yield of wheat and maize were 9.47,9.04 g/kg, respectively. If the SOC had not achieved the above level, the wheat and maize grain yield would increase 167.5,678.5 kg/ha with the SOC increasing per 1 g/kg, respectively. Straw returning and balanced fertilization were the effective means to promote the organic carbon content and conserve soil carbon pool in fluvo-aquic soil of North China Plain, which played a crucial role in ensuring food security in this region.

Key words: Fluvo-aquic soil of North China Plain, Long-term fertilizer, Organic carbon, Carbon sequestration rate, Carbon sequestration efficiency

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Cite this article

HUANG Shaohui, YANG Junfang, YANG Yunma, XING Suli, HAN Baowen, LIU Mengchao, HE Ping, JIA Liangliang. Soil Organic Carbon Sequestration under Long Term Fertilization Practices in Fluvo-Aquic Soil of North China Plain[J]. ACTA AGRICULTURAE BOREALI-SINICA, 2019, 34(S1): 168-175. doi: 10.7668/hbnxb.20190635.

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