Pedosphere 8(2): 181--186, 1998
ISSN 1002-0160/CN 32-1315/P
©1998 Soil Science Society of China
Published by Elsevier B.V. and Science Press
Transformation of straw 14C in Ultisol and Vertisol
WANG Zhi-Ming, HUANG Dong-Mai, ZHU Pei-Li and YAN Shao-Hua
Institute of Soil and Fertilizer, Jiangsu Academy of Agricultural Sciences, Nanjing 210014 (China)
ABSTRACT
      Laboratory incubation was conducted to investigate transform ation of straw 14C in Ultisol and Vertisol under aerobic condition for 112 d at 30 ℃. Dried and ground 14C-labeled rice and maize straws were mixed with the soils at the rate of 2.5 g kg-1. Decomposition of the straw C and native soil C both revealed two stages, being faster during the initial days, and slower thereafter. About 37.33%~48.80% of the straw C and 4.22%~6.83% of the native soil C decomposed by the end of the incubation. The kinds of the straws only slightly influenced the rates of their decomposition in soils, however, some retardation was found in Ultisol at the initial decomposition stage due to its lower pH. Positive priming effects were observed in the soils applied with straw, and the rate of priming effect ranged from 7.23% to 13.80%. Net losses of native soil C were found under such incubation conditions, except Ultisol with rice straw. Soil biomass C and 14C decreased gradually with incubation time, and seemed to be consistent with the decomposition patterns of straw C and native soil C. T he ratio of biomass 12C to biomass 14C ranged from 1.35 to 3.37. Soil biom ass C occu-pied 1.17%~2.32% of the total soil organic C, and the proportion of biomass 14C to the residual 14C varied from 7.3% to 14.3%.
Key Words:  carbon transformation, soil microbial biomass, straw 14C
Citation: Wang, Z. M., Huang, D. M., Zhu, P. L. and Yan, S. H. 1998. Transformation of straw 14C in Ultisol and Vertisol. Pedosphere. 8(2): 181-186.
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