Responses of microbial biomass and respiration of soil to topography,burning, and nitrogen fertilization in a temperate steppe |
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Authors: | Weixing Liu Wenhua Xu Yi Han Changhui Wang Shiqiang Wan |
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Institution: | (1) Laboratory of Quantitative Vegetation Ecology, Institute of Botany, The Chinese Academy of Sciences, Xiangshan, Beijing, 100093, China;(2) Graduate University of the Chinese Academy of Science, Yuquanlu, Beijing, 100049, People’s Republic of China |
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Abstract: | Temporal dynamics of microbial biomass and respiration of soil and their responses to topography, burning, N fertilization,
and their interactions were determined in a temperate steppe in northern China. Soil microbial indices showed strong temporal
variability over the growing season. Soil microbial biomass C (MBC) and N (MBN) were 14.8 and 11.5% greater in the lower than
upper slope, respectively. However, the percentage of organic C present as MBC and the percentage of total N present as MBN
were 16.9 and 26.2% higher in the upper than lower slope, respectively. Neither microbial respiration (MR) nor metabolic quotient
(qCO2) was affected by topography. Both MBC and MBN were increased by burning, on average, by 29.8 and 14.2% over the growing season,
and MR and qCO2 tended to reduce depending on the sampling date, especially in August. Burning stimulated the percentage of organic C present
as MBC and the percentage of total N present as MBN in the upper slope, but did not change these two parameters in the lower
slope. No effects of N fertilization on soil microbial indices were observed in the first growing season after the treatment.
Further research is needed to study the long-term relationships between changes in soil microbial diversity and activity and
plant community in response to burning and N fertilization. |
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Keywords: | Burning Microbial biomass N fertilization Metabolic quotient Temperate steppe Topography |
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