Effects of Long-term Application of Chemical Fertilizers on Organic Carbon and Humus Composition in Noncalcareous Fluvo-aquic Soil

doi:10.7668/hbnxb.20194632

Abstract

Abstract:

Soil organic carbon and humus components are affected by soil quality,fertilization management measures and other factors.In order to clarify the regulation effect of long-term chemical fertilizer application on soil organic carbon(SOC)and soil humus components in different soil layers,a 43 a(2021)long-term fertilization experiment was conducted in Laiyang,Shandong Province.Six treatments were selected:low nitrogen fertilizer(N1),high nitrogen fertilizer(N2),high nitrogen fertilizer combined with phosphorus fertilizer(NP),high nitrogen fertilizer combined with potassium fertilizer(NK),high nitrogen combined with phosphorus and potassium fertilizer(NPK)and no fertilizer control(CK).The results showed that compared with CK,N1 could significantly increase the SOC content of 0—5 cm,with an increase of 22.84%.Single nitrogen fertilizer treatment could significantly increase the SOC content of 5—10 cm,with an increase of 20.94% and 28.60% in N1 and N2,respectively.N1 could significantly increase the SOC content of 10—20 cm,with an increase of 17.05%,while other treatments had no significant change.Compared with CK,N1 could significantly increase the content of humic acid(HA)in 10—20 cm and 20—30 cm soil layers,with an increase of 22.86% and 40.49%,respectively,while there was no significant change in 0—10 cm soil layer.NP could significantly increase the content of fulvic acid(FA)in 0—5 cm and 5—10 cm soil layers by 89.44% and 124.63%,respectively.NK could significantly increase the content of FA in 10—20 cm soil layer by 100.22%,and NPK could significantly increase the content of FA in 20—30 cm soil layer by 107.48%.N1 could significantly increase the content of humin(Hu)in 0—5 cm soil layer,with an increase of 69.34%.N2 could significantly increase the content of Hu in 5—10 cm soil layer,with an increase of 66.18%.N1 could significantly increase the content of Hu in 10—20 cm soil layer,with an increase of 79.50%,while there was no significant change in 20—30 cm soil layer.In summary,under the conditions of this experiment,long-term application of chemical fertilizers can effectively improve the fixation of soil organic carbon in non-calcareous fluvo-aquic soil and change the composition of soil humus,and the effects of different fertilization strategies are quite different.Among them,the effect of single application of nitrogen fertilizer on carbon sequestration is better.

Key words: Long-term fertilization, Noncalcareous fluvo-aquic soil, Soil organic carbon, Humus component

WANG Junyan, WEI Wenliang, NIU Yunmeng, CUI Hao, SUN Xiaolu, XU Xuelei, LIU Shutang. Effects of Long-term Application of Chemical Fertilizers on Organic Carbon and Humus Composition in Noncalcareous Fluvo-aquic Soil[J]. Acta Agriculturae Boreali-Sinica, 2024, 39(4): 179-186. doi: 10.7668/hbnxb.20194632.

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References 36

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处理 Treatment	土层Soil layer
处理 Treatment	0~5 cm	5~10 cm	10~20 cm	20~30 cm
CK	8.07±0.31bc	7.63±0.13c	7.41±0.39bc	4.24±0.63a
N1	9.91±0.59a	9.22±0.26ab	8.68±0.97a	4.31±0.79a
N2	9.06±0.83ab	9.81±0.39a	7.66±0.55b	4.78±0.28a
NP	8.77±0.62b	7.77±1.18c	7.46±0.19bc	4.45±0.57a
NK	7.16±0.41c	7.78±0.57c	6.60±0.10c	5.16±0.35a
NPK	8.28±0.38b	8.58±0.13bc	7.48±0.13bc	4.58±0.06a

处理 Treatment	土层Soil layer
处理 Treatment	0~5 cm	5~10 cm	10~20 cm	20~30 cm
CK	8.07±0.31bc	7.63±0.13c	7.41±0.39bc	4.24±0.63a
N1	9.91±0.59a	9.22±0.26ab	8.68±0.97a	4.31±0.79a
N2	9.06±0.83ab	9.81±0.39a	7.66±0.55b	4.78±0.28a
NP	8.77±0.62b	7.77±1.18c	7.46±0.19bc	4.45±0.57a
NK	7.16±0.41c	7.78±0.57c	6.60±0.10c	5.16±0.35a
NPK	8.28±0.38b	8.58±0.13bc	7.48±0.13bc	4.58±0.06a

指标 Indexes	土壤有机碳 Soil organic carbon	水溶性物质 Water soluble substances	可提取腐殖物质 Extractable humic substances	胡敏酸 Humic acid	富里酸 Fulvic acid	胡敏素 Humin
土壤有机碳Soil organic carbon	1.000
水溶性物质Water soluble substances	0.459^**	1.000
可提取腐殖物质Extractable humic substances	0.624^**	0.532^**	1.000
胡敏酸Humic acid	0.640^**	0.163	0.333^**	1.000
富里酸Fulvic acid	0.299^*	0.506^**	0.813^**	-0.051	1.000
胡敏素Humin	0.804^**	0.468^**	0.664^**	0.517^**	0.448^**	1.000

指标 Indexes	土壤有机碳 Soil organic carbon	水溶性物质 Water soluble substances	可提取腐殖物质 Extractable humic substances	胡敏酸 Humic acid	富里酸 Fulvic acid	胡敏素 Humin
土壤有机碳Soil organic carbon	1.000
水溶性物质Water soluble substances	0.459^**	1.000
可提取腐殖物质Extractable humic substances	0.624^**	0.532^**	1.000
胡敏酸Humic acid	0.640^**	0.163	0.333^**	1.000
富里酸Fulvic acid	0.299^*	0.506^**	0.813^**	-0.051	1.000
胡敏素Humin	0.804^**	0.468^**	0.664^**	0.517^**	0.448^**	1.000

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