Response of Different Organic Carbon Fractions to Organic Carbon Accumulation in Typical Paddy Soils

doi:10.11924/j.issn.1000-6850.casb2025-0101

Abstract

Abstract:

To investigate the characteristics of soil organic carbon accumulation and its relationship with organic carbon fractions, 25 surface soil samples from each of 7 representative paddy fields (paddy soils) in Zhejiang Province were selected to determine the composition of different soil organic carbon forms. The response of each form of organic carbon to soil carbon accumulation was analyzed, and the saturation mechanism of soil organic carbon accumulation was explored. The results showed that with the accumulation of soil organic carbon, the content of humic acid, fulvic acid, humic acid carbon and humic acid carbon in various types of the soils showed an initial increase followed by a trend towards equilibrium. The content of these organic carbon components at equilibrium was positively correlated with the content of soil clay, silt and amorphous iron oxide. Free organic carbon increased linearly with the accumulation of soil organic carbon, and continued to increase when the soil organic carbon was at high level. In this case, the accumulated organic carbon in the soils was mainly in the form of free organic carbon. Results suggested that the saturation phenomenon of soil organic carbon was related to the form of organic carbon. The accumulation of humic acid, fulvic acid, humin carbon, and humic acid carbon closely associated with soil inorganic components was limited by the ability of mineral adsorption protection, and their contents increased with the increase of total soil organic carbon, but they tended to equilibrium when the mineral adsorption sites were saturated. The free organic carbon, mainly driven by the input amount of organic matter, was not obviously affected by soil physical protection, and it increased linearly with the accumulation of organic carbon, and its saturation phenomenon was not obvious. This study reveals the different contribution patterns of different forms of organic carbon components to the accumulation of organic carbon in paddy soil, which provides a theoretical basis for the development of accurate organic material input and soil fertilization strategies for regional paddy soil, and also provides a scientific reference for the sustainable management of paddy soil.

Key words: paddy soil, organic carbon, humus carbon, response, saturation value

YE Chengcheng, ZHU Jie, LI Zicheng, ZHANG Mingkui. Response of Different Organic Carbon Fractions to Organic Carbon Accumulation in Typical Paddy Soils[J]. Chinese Agricultural Science Bulletin, 2025, 41(28): 78-86.

Figures/Tables 8

References 28

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序号	土壤类型	砂粒	粉砂	黏粒	游离氧化铁	无定形氧化铁
1	红砂田	615	230	155	7.55	2.05
2	黄筋泥田	292	413	295	28.88	5.98
3	青紫泥田	200	415	385	18.54	7.65
4	泥砂田	521	324	155	5.14	1.55
5	培泥砂田	450	365	185	12.52	3.66
6	洪积泥砂田	428	377	195	10.59	4.65
7	黄泥砂田	322	413	265	26.42	7.11

序号	土壤类型	砂粒	粉砂	黏粒	游离氧化铁	无定形氧化铁
1	红砂田	615	230	155	7.55	2.05
2	黄筋泥田	292	413	295	28.88	5.98
3	青紫泥田	200	415	385	18.54	7.65
4	泥砂田	521	324	155	5.14	1.55
5	培泥砂田	450	365	185	12.52	3.66
6	洪积泥砂田	428	377	195	10.59	4.65
7	黄泥砂田	322	413	265	26.42	7.11

土壤	统计值	有机碳/	腐殖质碳/	游离有机碳/	HA+FA/	HA/	FA/	胡敏素/	H/F	腐殖质碳/
土壤	统计值	(g/kg)	(g/kg)	(g/kg)	(g/kg)	(g/kg)	(g/kg)	(g/kg)	H/F	%
红砂田	范围	3.25~28.22	3.01~11.66	0.24~16.56	2.42~7.65	0.78~2.93	1.55~5.00	0.59~4.80	0.38~0.72	41.32~92.62
(n=25)	平均值±标准差	13.77±7.08	8.69±2.70	5.08±4.98	5.89±1.69	2.12±0.63	3.76±1.09	2.81±1.17	0.57±0.08	69.91±14.97
	变异系数/%	51.45	31.11	98.01	28.65	29.91	28.83	41.86	13.82	21.42
黄筋泥田	范围	4.14~33.24	3.14~16.56	0.49~17.10	2.45~12.41	0.86~4.02	1.59~8.93	0.69~7.19	0.38~0.78	48.56~89.66
(n=25)	平均值±标准差	16.98±9.79	10.65±4.91	6.33±5.36	7.11±3.29	2.42±1.08	4.69±2.27	3.54±1.89	0.53±0.09	68.10±12.11
	变异系数/%	57.66	46.08	84.67	46.32	44.76	48.46	53.4	17.87	17.78
青紫泥田	范围	6.52~45.22	5.01~19.25	1.00~27.09	3.05~13.54	1.14~6.13	1.75~8.36	1.77~6.82	0.38~0.92	40.09~90.43
(n=25)	平均值±标准差	20.90±10.89	13.38±4.85	7.52±7.00	9.06±3.49	3.61±1.54	5.46±2.05	4.44±1.49	0.66±0.14	69.13±13.79
	变异系数/%	52.12	36.25	93.16	38.49	42.71	37.59	33.61	20.59	19.95
泥砂田	范围	2.65~29.41	2.41~11.14	0.24~19.12	1.78~8.74	0.65~3.03	1.02~5.84	0.63~4.26	0.44~0.74	34.39~90.94
(n=25)	平均值±标准差	15.62±8.99	8.25±3.00	7.38±6.69	5.67±2.30	1.97±0.76	3.71±1.56	2.58±0.99	0.55±0.07	62.54±18.87
	变异系数/%	57.57	36.34	90.77	40.56	38.58	42.07	38.42	12.67	30.18
培泥砂田	范围	2.97~31.44	2.54~12.87	0.43~18.90	1.87~9.63	0.59~3.84	1.28~6.34	0.67~5.31	0.35~0.82	39.89~86.03
(n=25)	平均值±标准差	17.41±8.62	9.76±3.36	7.65±5.71	6.56±2.26	2.30±0.86	4.26±1.48	3.20±1.36	0.55±0.11	62.45±13.99
	变异系数/%	49.52	34.44	74.69	34.43	37.31	34.76	42.44	20.75	22.4
洪积泥砂田	范围	4.11~36.47	3.74~16.02	0.37~21.43	2.45~11.54	0.83~4.25	1.55~7.59	0.87~6.33	0.45~0.72	41.24~91.00
(n=25)	平均值±标准差	19.62±10.14	11.58±4.50	8.04±6.36	7.58±3.10	2.74±1.13	4.84±2.00	4.00±1.67	0.57±0.08	64.31±12.39
	变异系数/%	51.67	38.83	79.12	40.92	41.39	41.44	41.83	13.36	19.26
黄泥砂田	范围	3.98~41.55	3.64~17.24	0.34~25.41	2.56~13.25	0.81~5.02	1.75~8.55	0.75~6.23	0.46~0.63	38.84~91.46
(n=25)	平均值±标准差	17.73±9.75	11.60±4.77	6.14±6.05	8.07±3.67	2.85±1.34	5.21±2.36	3.53±1.46	0.55±0.05	71.03±13.25
	变异系数/%	54.96	41.14	98.59	45.54	46.95	45.18	41.4	9.24	18.66

土壤	统计值	有机碳/	腐殖质碳/	游离有机碳/	HA+FA/	HA/	FA/	胡敏素/	H/F	腐殖质碳/
土壤	统计值	(g/kg)	(g/kg)	(g/kg)	(g/kg)	(g/kg)	(g/kg)	(g/kg)	H/F	%
红砂田	范围	3.25~28.22	3.01~11.66	0.24~16.56	2.42~7.65	0.78~2.93	1.55~5.00	0.59~4.80	0.38~0.72	41.32~92.62
(n=25)	平均值±标准差	13.77±7.08	8.69±2.70	5.08±4.98	5.89±1.69	2.12±0.63	3.76±1.09	2.81±1.17	0.57±0.08	69.91±14.97
	变异系数/%	51.45	31.11	98.01	28.65	29.91	28.83	41.86	13.82	21.42
黄筋泥田	范围	4.14~33.24	3.14~16.56	0.49~17.10	2.45~12.41	0.86~4.02	1.59~8.93	0.69~7.19	0.38~0.78	48.56~89.66
(n=25)	平均值±标准差	16.98±9.79	10.65±4.91	6.33±5.36	7.11±3.29	2.42±1.08	4.69±2.27	3.54±1.89	0.53±0.09	68.10±12.11
	变异系数/%	57.66	46.08	84.67	46.32	44.76	48.46	53.4	17.87	17.78
青紫泥田	范围	6.52~45.22	5.01~19.25	1.00~27.09	3.05~13.54	1.14~6.13	1.75~8.36	1.77~6.82	0.38~0.92	40.09~90.43
(n=25)	平均值±标准差	20.90±10.89	13.38±4.85	7.52±7.00	9.06±3.49	3.61±1.54	5.46±2.05	4.44±1.49	0.66±0.14	69.13±13.79
	变异系数/%	52.12	36.25	93.16	38.49	42.71	37.59	33.61	20.59	19.95
泥砂田	范围	2.65~29.41	2.41~11.14	0.24~19.12	1.78~8.74	0.65~3.03	1.02~5.84	0.63~4.26	0.44~0.74	34.39~90.94
(n=25)	平均值±标准差	15.62±8.99	8.25±3.00	7.38±6.69	5.67±2.30	1.97±0.76	3.71±1.56	2.58±0.99	0.55±0.07	62.54±18.87
	变异系数/%	57.57	36.34	90.77	40.56	38.58	42.07	38.42	12.67	30.18
培泥砂田	范围	2.97~31.44	2.54~12.87	0.43~18.90	1.87~9.63	0.59~3.84	1.28~6.34	0.67~5.31	0.35~0.82	39.89~86.03
(n=25)	平均值±标准差	17.41±8.62	9.76±3.36	7.65±5.71	6.56±2.26	2.30±0.86	4.26±1.48	3.20±1.36	0.55±0.11	62.45±13.99
	变异系数/%	49.52	34.44	74.69	34.43	37.31	34.76	42.44	20.75	22.4
洪积泥砂田	范围	4.11~36.47	3.74~16.02	0.37~21.43	2.45~11.54	0.83~4.25	1.55~7.59	0.87~6.33	0.45~0.72	41.24~91.00
(n=25)	平均值±标准差	19.62±10.14	11.58±4.50	8.04±6.36	7.58±3.10	2.74±1.13	4.84±2.00	4.00±1.67	0.57±0.08	64.31±12.39
	变异系数/%	51.67	38.83	79.12	40.92	41.39	41.44	41.83	13.36	19.26
黄泥砂田	范围	3.98~41.55	3.64~17.24	0.34~25.41	2.56~13.25	0.81~5.02	1.75~8.55	0.75~6.23	0.46~0.63	38.84~91.46
(n=25)	平均值±标准差	17.73±9.75	11.60±4.77	6.14±6.05	8.07±3.67	2.85±1.34	5.21±2.36	3.53±1.46	0.55±0.05	71.03±13.25
	变异系数/%	54.96	41.14	98.59	45.54	46.95	45.18	41.4	9.24	18.66

土壤类型	腐殖质碳	胡敏酸碳	富里酸碳	胡敏素碳	腐殖酸碳
红砂田	11.77	2.79	4.52	4.46	7.44
泥砂田	16.48	3.79	7.80	5.01	9.93
青紫泥田	18.31	5.20	7.65	6.10	12.98
黄筋泥田	14.36	2.29	5.14	3.37	7.75
培泥砂田	12.65	2.97	5.54	5.13	8.78
黄泥砂田	15.78	3.88	6.93	5.00	10.90
洪积泥砂田	16.48	4.52	7.43	4.65	14.01