[1]HU Yanbin,XIAO Guoju,QIU Zhengji,et al.Distribution Characteristics of Soil Organic Carbon and Total Nitrogen and Its Influence on Film-Mulched Maize in Farmland in Northwest Semiarid Region[J].Research of Soil and Water Conservation,2021,28(01):58-64.
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Distribution Characteristics of Soil Organic Carbon and Total Nitrogen and Its Influence on Film-Mulched Maize in Farmland in Northwest Semiarid Region
Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume:
28
Number of periods:
2021 01
Page number:
58-64
Column:
Public date:
2021-01-10
- Title:
- Distribution Characteristics of Soil Organic Carbon and Total Nitrogen and Its Influence on Film-Mulched Maize in Farmland in Northwest Semiarid Region
- Keywords:
- semiarid district; SOC; TN; film-mulched maize; crop yield
- CLC:
- F301.21
- DOI:
- -
- Abstract:
- This research was conducted to explore the soil carbon and nitrogen contents of farmland soil and the influence of different carbon and nitrogen contents on crop yield in the semiarid region of northwest China, so as to provide theoretical basis for national food security and sustainable development of arable land. A two-year field research method of farmland ecosystem survey sampling was persistently performed in the semiarid area of northwest China. In 2017—2018, the survey areas were the towns such as Baiyang, Chengyang and Caomiao Town. The whole plant sampling was carried out at the mature stage of mulch maize, and the influence of soil carbon and nitrogen on maize yield was studied by centering on the variation trend of soil organic carbon(SOC), total nitrogen(TN)and carbon nitrogen ratio(C/N)in the topsoil. The yield composition and actual yield of maize seeds were determined to understand the change of the SOC and TN contents of farmland soils and their impacts on crop yield, which has important guiding significance for farmland ecosystem in fertilizer application, soil nutrient utilization and production. The results showed that the SOC, TN and C/N of the cultivated soil in the survey area were between 4.00～14.00 g/kg, 0.80～1.30 g/kg and 5.00～13.00, and the TN increased with the increase of SOC; overall, within a certain threshold, the increases in SOC, TN and C/N have the positive effect on rise of maize yield; when the surface SOC content is 4.00～14.00 g/kg, the SOC content increases by 1 g/kg, the maize yield increases by 0.79%～12.20%; when the surface TN content is 0.80～1.10 g/kg, the TN content increases by 0.1 g/kg, the maize yield increases by 4.60%～12.40%; when the surface TN content is 1.10～1.30 g/kg, the TN content increases by 0.1 g/kg, the maize yield decrease by 11.86%～20.05%; when the surface C/N content is 5.00～13.00, the maize yield increases by 1.55%～24.09%. In the case that other established conditions are unchanged, the semi-arid region in northwest China has the potential to increase crop yield by increasing soil carbon and nitrogen content. Within a certain threshold, maintaining a high level of soil carbon and nitrogen content has a very significant effect on cost-saving and efficiency in northwest semi-arid area. Therefore, it is very important to study the influence of soil carbon and nitrogen contents on crop yields to ensure national food security and sustainable use of cultivated land.
- References:
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Last Update:
2021-01-15