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《RESOURCES AND ENUIRONMENT IN THE YANGTZA BASIN》 1998-02
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THE CYCLING AND BALANCE OF SOIL ORGANIC CARBON AND UTILIZATION OF ORGANIC RESOURCES IN RED SOIL REGION OF CHINA

Li Zhongpei Zhang Taolin Lin Xinxiong (Institute of Soil Science,The Chinese Academy of Sciences, Nanjing,210008)  
On the basis of sampling analysis, investigation and field experiment results, this paper discussed the variation and its affecting factors of soil organic carbon content in red soil region, dealt with the cycling and balance characteristics of soil organic carbon, primarily elucidated the relationships between soil organic carbon and soil fertility degradation, proposed the rational measures and ways of organic material use according to regional condition. The mean soil organic carbon content in farmland of red soil region was lower than that in phaeozem plain(the black earth plain of northeast China), middle-lower reaches of Yangtze river and delta region of Zhujiang river, higher than that in Huang huai hai plain and loess plateau; the major causes resulting in the variation of soil organic carbon content were the different inputs of organic materials to soils resulting from different natural condition and human activity. The humification coefficients of organic materials in red soil were 0.15~0.55, which varied with chemical composition of organic materials, soil texture, soil acidity, landuse patterns, and natural soil organic carbon content, infertile red soil having a value 41% higher than that in common red soil; red soil organic carbon in rice field had annual decomposition rates of 2.4%~3.2%,the higher the soil organic carbon content, the greater the decomposition rate; in general, organic carbon pool of red soil farmland, especially in rice field with low yield and in upland farmland, was in a deficit state. The degraded red soil was characterized by less than 8.7g/kg of organic carbon content,Only about 40% of soil organic carbon storage in whole profile of upland soil with high fertility, little HA/FA ratio and E 4 value of humic acid, low cycling level of organic carbon with characteristic of lower input than output, and high loss of organic carbon by runoff. The soil organic carbon content of rice field would be increased with a moderate application of organic manure. At present, organic materials in red soil region are in a state of insufficient application, uneven distribution, low input to upland soil and infertile rice field. Therefore,applicable techniques ought to be developed for application of organic manure in rice field; and intercropping and rotation of trees and crops, intercropping of crops and green manure, semi-zero tillage, and ways of decreasing the runoff should be applied for increase of upland soil fertility.
【Fund】: 国家“九五”攻关专题 中国科学院网络项目
【CateGory Index】: S153.62,S155.25
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