Effects of Liming on Formation of Mineral-associated Organic Carbon in Acidic Soil

doi:10.11924/j.issn.1000-6850.casb2020-0558

Abstract

Abstract:

To understand how liming affects mineral-associated organic carbon (C) and promote organic C sequestration in acidic soils, the authors synthesized the published data in the literature and conducted a laboratory incubation to explore the potential mechanism of mineral-associated C formation in response to liming in acidic soils. The results showed that liming promoted the formation of mineral-associated organic C in most published studies. Our laboratory incubation experiment found that liming significantly promoted straw decomposition and increased microbial biomass C, which could be one of the main mechanisms that contribute to the formation of mineral-associated C. In addition, our laboratory incubation also found that liming reduced the formation of iron/aluminum-bound C, while it promoted the formation of calcium-bound C. Together, these results suggested that the application of lime in acidic soils could promote the formation of mineral-associated organic C, but might change the relative contents of organic C associated with different chemical bonds.

Key words: acidification, lime, microbial activity, mineral-associated carbon, straw incorporation

CLC Number:

Q148

Wu Bin, Xu Jingjing, Cheng Yanhong, Ye Chenglong, Hu Shuijin. Effects of Liming on Formation of Mineral-associated Organic Carbon in Acidic Soil[J]. Chinese Agricultural Science Bulletin, 2021, 37(21): 98-105.

Figures/Tables 4

References 50

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研究地点	土壤类型		石灰类型		初始pH	采土深度/cm	微生物生物量碳	植物生产力		土壤有机碳		矿物结合有机碳		参考文献
Ranchi (India)	Typic Haplustalf		NA		5.3	0~15	NS	NA		NS		NS		[18]
Waite Agricultural Research Institute (Australia)	Rhodoxeralf		碳酸钙		4.1	0~10	NA	NA		NS		+		[30]
Ponta Grossa (Brazil)	Oxisol		白云石石灰		4.5	0~2.5	NA	+		+		NS/+		[31-32]
São Paulo State (Brazil)	Typic Haplorthox		白云石石灰		NA	0~5	NA	NS/+		+		+		[33]
Wagga Wagga (Australia)	Oxic Paleustalf	碳酸钙		<4.7		0~5	NS/+		NA		-		NS		[34]
Ponta Grossa (Brazil)	Oxisol	NA		4.6		0~60	NA		+		NS/+		+		[35]
Harpenden (United Kingdom)	Aquic Paleudalf	碳酸钙		4.4		0~23	NA		NA		NA		+		[36]

研究地点	土壤类型		石灰类型		初始pH	采土深度/cm	微生物生物量碳	植物生产力		土壤有机碳		矿物结合有机碳		参考文献
Ranchi (India)	Typic Haplustalf		NA		5.3	0~15	NS	NA		NS		NS		[18]
Waite Agricultural Research Institute (Australia)	Rhodoxeralf		碳酸钙		4.1	0~10	NA	NA		NS		+		[30]
Ponta Grossa (Brazil)	Oxisol		白云石石灰		4.5	0~2.5	NA	+		+		NS/+		[31-32]
São Paulo State (Brazil)	Typic Haplorthox		白云石石灰		NA	0~5	NA	NS/+		+		+		[33]
Wagga Wagga (Australia)	Oxic Paleustalf	碳酸钙		<4.7		0~5	NS/+		NA		-		NS		[34]
Ponta Grossa (Brazil)	Oxisol	NA		4.6		0~60	NA		+		NS/+		+		[35]
Harpenden (United Kingdom)	Aquic Paleudalf	碳酸钙		4.4		0~23	NA		NA		NA		+		[36]