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[1]ZHANG Shihan,WU Jun,ZHANG Renzhi,et al.Effects of Different Nitrogen Addition Levels on Soil Particulate Organic Carbon in Dry Farmland of Central Gansu Province on the Loess Plateau[J].Research of Soil and Water Conservation,2019,26(06):7-11.

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Effects of Different Nitrogen Addition Levels on Soil Particulate Organic Carbon in Dry Farmland of Central Gansu Province on the Loess Plateau

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 26 Number of periods: 2019 06 Page number: 7-11 Column: Public date: 2019-10-17

Title:: Effects of Different Nitrogen Addition Levels on Soil Particulate Organic Carbon in Dry Farmland of Central Gansu Province on the Loess Plateau

Author(s):: ZHANG Shihan¹, WU Jun^1,2, ZHANG Renzhi^1,2,3, CAI Liqun^1,2,3, QI Peng^1,2, ZHANG Jun^1,2,3; 1. College of Resources and Environmental Sciences, Gansu Agricultural University, Lanzhou 730070, China;
2. Gansu Provincial Key Laboratory of Arid Land Crop Science, Gansu Agricultural University, Lanzhou 730070, China;
3. Gansu Engineering Research Center for Agriculture Water-Saving, Lanzhou 730070, China

Keywords:: carbon sequestration capacity; nitrogen application; soil total organic carbon; mineral-associated organic carbon

CLC:: S158.5;S153.6⁺2

DOI:: -

Abstract:: In order to explore the effects of different nitrogen addition levels on soil organic carbon in dry farmland in central Gansu Province on the Loess Plateau, based on the nitrogen addition location experiment conducted at the Rainfed Agricultural Experimental Station of Gansu Agricultural University, Dingxi City, Gansu Province, in 2013, the density fractionation method[NaI:(1.70±0.02) g/cm³] was used to explore the effects of four nitrogen addition levels (N₀, N_52.5, N₁₀₅, N_157.5) on soil total organic carbon (STOC), free particulate organic carbon (FPOC), occluded particulate organic carbon (OPOC), mineral-associated organic carbon (MOC). The results showed that the contents of STOC, FPOC, OPOC, MOC, and FPOC/STOC, OPOC/STOC decreased with the increase of depth of soil layer under different treatments in the 0-20 cm soil layers, and MOC/STOC increased with the increase of depth of the soil layer; compared with the N₀ treatment, N_52.5, N₁₀₅ and N_157.5 treatments could increase the FPOC/STOC, OPOC/STOC and the contents of STOC, FPOC, OPOC, and N₁₀₅ treatment had the best effect on these ratios; N₁₀₅ and N_157.5 treatments significantly increased the MOC content in 0-20 cm layer, and N₁₀₅ treatment had the best effect on the increase of MOC content. In conclusion, N₁₀₅ treatment can effectively promote soil carbon sequestration capacity, reduce input costs, and can be selected as the reasonable application amount of nitrogen fertilizer for spring wheat cultivation in this area.

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