Pedosphere 5(2): 127--133, 1995
ISSN 1002-0160/CN 32-1315/P
©1995 Soil Science Society of China
Published by Elsevier B.V. and Science Press
| Nitrogen mineralization potentials of upland soils in Central China |
| CHEN Jia-Zhou and QIN Hua-Chang |
| Department of Soil and Agrochemistry, Huazhong Agricultural University, Wuhan 430070 (China) |
| ABSTRACT |
| Nitrogen mineralization potentials of 15 soil samples were studied by the methods of soil aerobic incubation, and the correlation between the potentials and the amounts of nitrogen taken up by rye grass (Lolium multiflorum Lam.) in pot culture was calculated. The soils were collected from Hubei Province in Central China. Soil nitrogen mineralization potentials (NO) were calculated and optimized by a quick-BASIC program. NO ranged from 60 mg kg-1 to 340 mg kg-1, which accounted for 9.1% to 34.6% of the total nitrogen content. Among the examined soils, yellow-brown soil collected from Wuhan had the largest NO and brown-red soil from Xianning had the smallest one. The mineralization rate constants (k) ranged from 0.00556 d-1 to 0.01280 d-1, in average 0.00882 d-1. Chao soil from Wuhan had the greatest k while yellow-cinnamon soil from Zhaoyang had the smallest one. There were apparent differences between mineralization parameters (NO and k) optimized and non-optimized ones. Optimized NO had a better correlation than non-optimized NO with the amount of nitrogen accumulated in the aerial parts of rye grass. NO, NO × k and Nt(accumulated mineralized nitrogen within time t) could be used as indexes of soil nitrogen supply. Among them Nt was the best, which was significantly correlated with the amounts of nitrogen accumulated in the aerial parts of rye grass harvested at three different times. |
| Key Words: aerobic incubation, nitrogen mineralization potential, parameter optimization, upland soil |
| Citation: Chen, J. Z. and Qin, H. C. 1995. Nitrogen mineralization potentials of upland soils in Central China. Pedosphere. 5(2): 127-133. |
|
View Full Text
|
|
|
|
