| 生物土壤与生态 |
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| Microorganisms, Soil Nutrient and Enzyme Activity Changing with the Proceeding of Desert Steppe Degradation in Inner Mongolia |
| LV Gui-fen, WU Yong-sheng, LI Hao, MA Wan-li, LU Ping |
| College of Life Science and Technology & Biodiversity Conservation Center in Inner Mongolia Normal University, Hohhot 010022, China |
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Abstract Soil microbial quantities, microbial biomass C, nutrition, and enzyme activity of desert steppe ecosystem in different degeneration phases were studied in this paper. The results showed: with the expansion of desert steppe degeneration degree, the soil microbial quantities, microbial biomass C, nutrition and enzyme activity changed at different degree. Among them the soil microbial quantities, microbial biomass C and enzyme activity appeared a tendency of descendent with the proceeding of desert steppe degradation, each index showed as follows: lightly degenerated > middle degenerated > heavily degenerated; so did soil nutrition except soil total Potassium which appeared unobvious regulative change. The results indicated that the degradation of desert steppe had a significant influence on the soil microbial quantities, microbial biomass C, nutrition and enzyme activity, and the soil microorganism had response to the degeneration of grassland. Meanwhile, the result of correlation analysis indicated that there were significant correlation among soil microbial quantities, soil microbial biomass C, soil nutrition, and soil enzyme activity, and these indexes could be deemed as the effective evidence to assess the soil fertility.
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Received: 16 October 2008
Published: 20 January 2010
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2010, Vol. 30 
