Pedosphere 8(4): 311--316, 1998
ISSN 1002-0160/CN 32-1315/P
©1998 Soil Science Society of China
Published by Elsevier B.V. and Science Press
| Effect of land use pattern on mineralization of residual C and N from plant materials decomposing under field conditions |
| CHENG Li-Li and WEN Qi-Xiao |
| Institute of Soil Science, the Chinese Academy of Sciences, P. O. Box 821, Nandng 210008 (China) |
| ABSTRACT |
| Four kinds of plant materials (astragalus, azolla, rice straw and water hyacinth) were allowed to decompose for 10 years in two soils with different mineralogical characteristics in fields under upland and submerged conditions. Greater amounts of C and N from azolla were retained in soils throughout the 10-year experimental period compared to those from the other plant materials. The residual C of all the plant materials in the two soils under upland conditions mineralized at rates corresponding to half-lives between 4.4~6.6 years, while the corresponding figures for those under submerged conditions were between 6.5~13.1 years. Mineralization of residual organic N followed the same pattern as residual C. Compared to residual C, however, the mineralization rates of residual organic N in most cases were significantly lower and the percentages of added N retained in soils were higher. More N from plant materials was retained in the yellow-brown soil than in the red soil, but no consistent differences in the amounts of C from plant materials and in the mineralization rates of both residual C and residual organic N between the two soils could be found. |
| Key Words: half-life, mineralization, residual C, residual organic N |
| Citation: Cheng, L. L. and Wen, Q. X. 1998. Effect of land use pattern on mineralization of residual C and N from plant materials decomposing under field conditions. Pedosphere. 8(4): 311-316. |
| |
|
View Full Text
|
|
|
|
