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- Title
Distribution characteristics of soil humus fractions stable carbon isotope natural abundance (ς<sup>13</sup>C) in paddy field under long-term ridge culture.
- Authors
TANG Xiao-hong; LUO You-jin; REN Zhen-jiang; Lü Jia-ke; WEI Chao-fu
- Abstract
A 16-year field experiment was conducted in a ridge culture paddy field in the hilly region of Sichuan Basin, aimed to investigate the distribution characteristics of stable carbon isotope natural abundance (δ 13 C) in soil humus fractions. The soil organic carbon (SOC) content in the paddy field under different cultivation modes ranked in the order of wide ridge culture > ridge culture > paddy and upland rotation. In soil humus substances ( HS) , humin ( HU) was the main composition, occupying 21% -30% of the total SOC. In the extracted soil carbon, humic acid (HA) dominated, occupying 17%-21% of SOC and 38%-65% of HS. The δ 13 C value of SOC ranged from -27. 9%c to -25. 6%e, and the difference of the δ 13 C value between 0-5 cm and 20-40 cm soil layers was about 1. 9%e. The δ 13 C value of HA under different cultivation modes was %c— 2%c lower than that of SOC, and more approached to the δ C value of rapeseed and rice residues. As for fulvic acid (FA) , its δ 13 C value was about 2%c and 4%e higher than that of SOC and HA, respectively. The δ 13 C value of HU in plough layer (0-20 cm) and plow layer (20-40 cm) ranged from -23. l%c—24. 9%e and -22. 6%e—24. 2%c, respectively, reflecting the admixture of young and old HS. The δ 13 C value in various organic carbon fractions was HU>FA >SOC >rapeseed and rice residues>HA. Long-term rice planting benefited the increase of SOC content, and cultivation mode played an important role in affecting the distribution patterns of soil humus δ 13 C in plough layer and plow layer.
- Subjects
DISTRIBUTION (Probability theory); HUMUS; CARBON isotopes; RICE field irrigation; HUMIC acid content of soils; TILLAGE; FULVIC acids
- Publication
Yingyong Shengtai Xuebao, 2011, Vol 22, Issue 4, p985
- ISSN
1001-9332
- Publication type
Article