Pedosphere 16(5): 634--645, 2006
ISSN 1002-0160/CN 32-1315/P
©2006 Soil Science Society of China
Published by Elsevier B.V. and Science Press
| Estimation of turnover and equilibrium of soil organic matter using a mathematical approach |
WU Chun-Yan , CHEN Yi, WANG Jia-Yu and WANG Sheng-Jia |
| Institute of Environmental Resources & Soil Fertilizer, Zhejiang Academy of Agricultural Sciences, Hangzhou 310021 (China). E-mail: chywu_1@163.com |
| ABSTRACT |
| The methods based on N uptake of aerial-plants, soil organic matter (SOM) dynamics, Jenny's equation, and actual measurement of long-term field experiments in Jiaxing, Quzhou, Huangyan and Hangzhou of Zhejiang Province, China were used to determine the organic mineralization rate being helpful in estimating the organic requirement for SOM equilibrium. The results showed that the estimated mineralization ratios of SOM for Jiaxing and Quzhou were, respectively, 0.0404 and 0.0508 based on N uptake of aerial-plants in non-fertilized plots; 0.0405 and 0.012 using SOM dynamics in non-fertilized plots; and 0.0413 and 0.0513 using the actual investigated data and Jenny's equation. With Jenny's equation, soil organic C balance in manure + N-P-K plots was estimated at nearly 28.8 g kg-1 for Jiaxing and 32.4 g kg-1 for Quzhou with predicted SOM linearly related to the actual investigated values (r2 = 0.9640 for Jiaxing and 0.8541 for Quzhou). To maintain the SOM balance in the non-fertilized plots the recommended rate of organic materials was 3 000-6 600 kg ha-1, and the relevant rates of farm yard manure (FYM) in the manure and N-P-K plots were estimated at 3 375 (dry) and 17670 kg ha-1 (wet) for Jiaxing, 1845 (dry) and 6090 kg ha-1 (wet) for Quzhou. |
| Key Words: equilibrium, mathematic modeling, rice fields, soil organic matter (SOM), turnover |
| Citation: Wu, C. Y., Chen, Y., Wang, J. Y. and Wang, S. J. 2006. Estimation of turnover and equilibrium of soil organic matter using a mathematical approach. Pedosphere. 16(5): 634-645. |
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