Spectral Characteristics of Soil Water-soluble Organic Carbon Affected by Cultivation Methods During Rice Growth Period

doi:10.11924/j.issn.1000-6850.casb2024-0624

Abstract

Abstract:

Soil water-soluble organic carbon (WSOC) changed with cultivation methods is of great significance to crop growth and soil carbon cycle. In this study, a field experiment was conducted to compare the effects of rotary tillage (RT) and no tillage (NT) on the content and spectral characteristics of WSOC during the key growth period of rice in rice-wheat rotation system in the Taihu Lake Region. The results showed that the content of soil organic carbon (SOC) in RT and NT treatments increased from 21.73 g/kg and 21.30 g/kg before rice planting to 21.95 g/kg and 23.49 g/kg after rice harvest, respectively. Meanwhile, the content of water-soluble organic carbon in RT and NT treatments increased from 1.74 g/kg and 1.66 g/kg before rice planting to 3.74 g/kg and 4.35 g/kg after rice harvest, respectively. No tillage for rice-wheat rotation system was more conducive to increasing soil carbon sequestration and water-soluble organic carbon. Under the both tillage methods, the SUVA₂₅₄ and SUVA₂₆₀ of WSOC after rice harvest decreased slightly compared to that before planting rice, and the SUVA₂₅₄ and SUVA₂₆₀ of NT were higher than those of RT, while E₂/E₃ and E₃/E₄ were both increased. No tillage was more conducive to improving the aromaticity and humification of WSOC than RT for rice-wheat rotation system. Compared to rotary tillage, no tillage was more conducive to improving the stability of WSOC and had a positive effect on increasing soil carbon sequestration in paddy soil of rice-wheat rotation system.

Key words: rotary tillage, no tillage, water-soluble organic carbon, spectral characteristics, rice-wheat rotation system

DONG Linlin, YAN Kai, SHENG Xuewen, LU Changying, SHI Linlin, WANG Haihou, WU Zhenggui. Spectral Characteristics of Soil Water-soluble Organic Carbon Affected by Cultivation Methods During Rice Growth Period[J]. Chinese Agricultural Science Bulletin, 2025, 41(9): 99-106.

Figures/Tables 6

References 25

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	SOC	WSOC	WSN	WSOC/SOC	WSOC/WSN	SIUVA₂₅₄	SUVA₂₆₀	E₂/E₃	E₃/E₄
SOC	1
WSOC	0.285^*	1
WSN	-0.079	0.362^**	1
WSOC/SOC	0.436^**	0.992^**	0.076	1
WSOC/WSN	0.475^**	0.909^**	-0.312^*	0.898^**	1
SIUVA₂₅₄	0.17	0.247	-0.477^**	0.207	0.417^**	1
SUVA₂₆₀	0.172	0.253	-0.476^**	0.212	0.422^**	0.922^**	1
E₂/E₃	-0.05	0.143	0.080	0.163	0.120	-0.073	-0.074	1
E₃/E₄	-0.057	0.034	0.025	0.055	0.009	-0.174	-0.174	0.877^**	1

	SOC	WSOC	WSN	WSOC/SOC	WSOC/WSN	SIUVA₂₅₄	SUVA₂₆₀	E₂/E₃	E₃/E₄
SOC	1
WSOC	0.285^*	1
WSN	-0.079	0.362^**	1
WSOC/SOC	0.436^**	0.992^**	0.076	1
WSOC/WSN	0.475^**	0.909^**	-0.312^*	0.898^**	1
SIUVA₂₅₄	0.17	0.247	-0.477^**	0.207	0.417^**	1
SUVA₂₆₀	0.172	0.253	-0.476^**	0.212	0.422^**	0.922^**	1
E₂/E₃	-0.05	0.143	0.080	0.163	0.120	-0.073	-0.074	1
E₃/E₄	-0.057	0.034	0.025	0.055	0.009	-0.174	-0.174	0.877^**	1