Earth Science Frontiers ›› 2011, Vol. 18 ›› Issue (6): 134-142.

• Article • Previous Articles     Next Articles

Microbial carbon distribution and its controlling factors in arable soils of eastern China.

  

  1. 1. State Key Laboratory of Biogeology and Environmental Geology, China University of Geosciences(Beijing), Beijing 100083, China
    2. School of Earth Sciences and Resources, China University of Geosciences(Beijing), Beijing, 100083, China
  • Received:2011-08-31 Revised:2011-11-05 Online:2011-11-25 Published:2011-12-05

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Abstract:

The soil microbial carbon in arable soils of Eastern China was investigated by using the fumigationextraction (FE) method. The investigated arable soils span from 46.69846°N  to 28.39281°N, and are of different tillage types. The results show that, from north to south, the soil microbial C (MicroC) content in Northeast China is much higher than that in other locations, and the total organic carbon (TOC) and total nitrogen (TN) have the same trends. The correlation analysis showed that the soil type determined by specific environmental climatic condition and thus the geographic position plays a key role in controlling the MicroC distribution. The soil quality, an index for which is the ratio of MicroC to TOC calculated, is much related to the tillage type. Average annual temperature, pH, moisture, TOC and TN are the five main factors affecting the MicroC content and the ratio of microbial C to TOC for a certain soil type, but the key controlling factors varies among different soil types.

Key words:  eastern China, soil microbial C, the ratio of microbial C to TOC

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