[1]CHEN Chunlan,CHEN Anlei,WEI Wenxue,et al.Effect of Long-Term Fertilization on Accumulation of Soil Carbon and Nitrogen in Reddish Paddy Soil Profiles[J].Research of Soil and Water Conservation,2021,28(02):14-20.
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Effect of Long-Term Fertilization on Accumulation of Soil Carbon and Nitrogen in Reddish Paddy Soil Profiles
Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume:
28
Number of periods:
2021 02
Page number:
14-20
Column:
Public date:
2021-02-06
- Title:
- Effect of Long-Term Fertilization on Accumulation of Soil Carbon and Nitrogen in Reddish Paddy Soil Profiles
- CLC:
- S158.2; S153.5
- DOI:
- -
- Abstract:
- In order to study the effects of long-term fertilization on soil carbon and nitrogen accumulation in red paddy profiles, the data of a long-term positioning experiment were analyzed. The fertilization experiment was stated in 2004, including three treatments: CK(non-fertilizer), NPK(N, P, and K fertilizer application), and OF(reduced NPK fertilizer with rice straw application), according to the requirements of Chinese Ecosystem Research Network(CERN). The results showed that:(1)the contents and reserves of soil carbon, nitrogen significantly decreased along the depth of soil layer in OF treatment(0—80 cm, p<0.05);(2)after 11 years of fertilization, SOC and carbon reserve in 0—20 cm were significantly different among three treatments, which followed the order: OF>NPK>CK; TN and nitrogen reserve in 0—20 cm were not significantly different between the treatments of NPK and OF, while the nitrogen reserve in the treatment of NPK was more than that in the treatment of OF in 40—80 cm;(3)there were no significant differences of carbon storage in the 0—80 cm soil layers, while the nitrogen storage in 0—80 cm in the treatment of NPK were significantly higher than that in the treatments of OF and CK;(4)compared to the beginning of the experiment, the increment of contents and reserves of soil carbon, nitrogen in 20—40 cm were the most among the other soil layers;(5)there was positive relationship between SOC and nitrogen reserve in 0—80 cm(y=11.644x-0.8737,R2=0.9759). Totally, the responses of contents and reserves of soil carbon, nitrogen in red soil paddy fields to long-term fertilization were more sensitive in surface layer than that in deep soil. The treatment of OF significantly increased the reserves of soil carbon, nitrogen in the surface soil, while the treatment of NPK increased those in the deep soil. Therefore, long-term fertilization with high amount of chemical fertilizer may increase the risk of nitrogen migration to the deep soil, while the reduced chemical fertilizer combined with straw returning can be more beneficial to maintaining the sustainability of carbon and nitrogen in the red paddy soil.
- References:
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Last Update:
2021-02-10