Organic carbon fractions affected by long-term fertilization in a subtropical paddy soil

doi:10.1007/s10705-009-9279-2

	Organic carbon fractions affected by long-term fertilization in a subtropical paddy soil
	Huang, Shan 1; Rui, Wenyi 1; Peng, Xianxian 1; Huang, Qianru 1; Zhang, Weijian 1,2
刊名	NUTRIENT CYCLING IN AGROECOSYSTEMS
	2010
卷号	86 期号:1 页码:153-160
关键词	Carbon fractions Long-term fertilization experiment Paddy soils Soil aggregates Soil carbon sequestration
ISSN号	1385-1314
DOI	10.1007/s10705-009-9279-2
通讯作者	Huang, Shan
英文摘要	Increasing evidence is showing a greater potential for carbon (C) sequestration in paddy soils than in upland soils. However, the mechanisms underlying long-term accumulation and protection of soil organic carbon (SOC) in paddy fields have not been well documented. In the present study, five soil C fractions were separated by physical fractionation in a subtropical paddy field following 27-year differential fertilization regimes (started in 1981). Results showed that, compared to the initial level, long-term rice (Oryza sativa L.) cropping increased SOC concentrations by 28.8, 30.1, 30.8, and 61.6% in the non-fertilized (CK), nitrogen (N), nitrogen-phosphorus-potassium (NPK), and NPK combined with farmyard manure (NPK + FYM) treatments, respectively. Application of FYM enhanced the formation of macroaggregates (> 2,000 and 250-2,000 mu m), whereas no significant differences in aggregate-size distribution were found among the CK, N, and NPK treatments. Inorganic fertilization (N and NPK) did not affect the concentration of either total SOC or any C fraction as compared with the CK, whereas application of FYM significantly increased the concentrations both in total SOC (25.5%) and in all C fractions, except coarse particulate organic matter (cPOM). Carbon in the paddy soil was dominated by free silt and clay (s + c_f) and intra-aggregate particulate organic matter within microaggregates (iPOM_m) in all treatments that accounted for 46.4-49.6% and 25.1-27.2% of the total SOC, respectively. Furthermore, the differences in C in the iPOM_m and s + c_f fractions between the CK and NPK + FYM treatments accounted for 53.2 and 38.8% of the differences in total SOC stocks, respectively. These results indicate that SOC originating from manure is stored mainly in fractions with slow turnover (i.e., iPOM_m and s + c_f), which may benefit the long-term C sequestration in paddy soils.
学科主题	Soil Science ; SOIL SCIENCE
语种	英语
出版者	SPRINGER
WOS记录号	WOS:000272656700010
内容类型	期刊论文
源URL	[http://111.203.20.206/handle/2HMLN22E/5463]
专题	作物科学研究所_栽培生理学系
作者单位	1.Nanjing Agr Univ, Inst Appl Ecol, Nanjing 210095, Peoples R China 2.Chinese Acad Agr Sci, Inst Crop Sci, Beijing 100081, Peoples R China
推荐引用方式 GB/T 7714	Huang, Shan,Rui, Wenyi,Peng, Xianxian,et al. Organic carbon fractions affected by long-term fertilization in a subtropical paddy soil[J]. NUTRIENT CYCLING IN AGROECOSYSTEMS,2010,86(1):153-160.
APA	Huang, Shan,Rui, Wenyi,Peng, Xianxian,Huang, Qianru,&Zhang, Weijian.(2010).Organic carbon fractions affected by long-term fertilization in a subtropical paddy soil.NUTRIENT CYCLING IN AGROECOSYSTEMS,86(1),153-160.
MLA	Huang, Shan,et al."Organic carbon fractions affected by long-term fertilization in a subtropical paddy soil".NUTRIENT CYCLING IN AGROECOSYSTEMS 86.1(2010):153-160.