Pedosphere 16(4): 409--419, 2006
ISSN 1002-0160/CN 32-1315/P
©2006 Soil Science Society of China
Published by Elsevier B.V. and Science Press
| Modeling soil organic matter dynamics under intensive cropping systems on the Huang-Huai-Hai Plain of China |
LEI Hong-Jun 1,2, LI Bao-Guo1, BAI You-Lu3, HUANG Yuan-Fang1, LÜ Yi-Zhong1 and LI Gui-Tong1 |
1 College of Resources and Environmental Sciences, China Agricultural University, Beijing 100094 (China). Email: hj_lei2002@163.com;
2 North China Institute of Water Conservancy and Hydroelectric Power, Zhengzhou 450008 (China);
3 Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Beijing 100081 (China) |
| ABSTRACT |
| A modified CQESTR model, a simple yet useful model frequently used for estimating carbon sequestration in agricultural soils, was developed and applied to evaluate the effects of intensive cropping on soil organic matter (SOM) dynamics and mineralization as well as to estimate carbon dioxide emission from agricultural soils at seven sites on the Huang-Huai-Hai Plain of China. The model was modified using site-specific parameters from short- and mid-term buried organic material experiments at four stages of biomass decomposition. The predicted SOM results were validated using independent data from seven long-term (10-to 20-year) soil fertility experiments in this region. Regression analysis on 1151 pairs of predicted and measured SOM data had an r2 of 0.91 (P ≤ 0.01). Therefore, the modified model was able to predict the mineralization of crop residues, organic amendments, and native SOM. Linear regression also showed that SOM mineralization rate (MR) in the plow layer increased by 0.22% when annual crop yield increased by 1 t ha-1 (P ≤ 0.01), suggesting an improvement in SOM quality. Apparently, not only did the annual soil respiration efflux merely reflect the intensity of soil organism and plant metabolism, but also the SOM MR in the plow layer. These results suggested that the modified model was simple yet valuable in predicting SOM trends at a single agricultural field and could be a powerful tool for estimating C-storage potential and reconstructing C storage on the Huang-Huai-Hai Plain of China. |
| Key Words: carbon dioxide emission, intensive cropping system, modeling, modified CQESTR model, soil organic matter |
| Citation: Lei, H. J., Li, B. G., Bai, Y. L., Huang, Y. F., LÜ Yi-Zhong and Li, G. T. 2006. Modeling soil organic matter dynamics under intensive cropping systems on the Huang-Huai-Hai Plain of China. Pedosphere. 16(4): 409-419. |
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