Soil N forms and gross transformation rates in Chinese subtropical forests dominated by different tree species
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- 作者：Yelin Zeng (1)
Wenhua Xiang (1)
Xiangwen Deng (1)
Xi Fang (1)
Cong Liu (1)
Changhui Peng (1) (2) - 关键词：Soil N forms ; N transformation rate ; Tree species ; 15N isotope pool dilution ; Microbial biomass ; China subtropical forests
- 刊名：Plant and Soil
- 出版年：2014
- 出版时间：November 2014
- 年：2014
- 卷：384
- 期：1-2
- 页码：231-242
- 全文大小：383 KB
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17. Huygens D, Boechx P, Templer - 作者单位：Yelin Zeng (1)
Wenhua Xiang (1)
Xiangwen Deng (1)
Xi Fang (1)
Cong Liu (1)
Changhui Peng (1) (2)
1. Faculty of Life Science and Technology, Central South University of Forestry and Technology, Changsha, 410004, China
2. Institute of Environment Sciences, Department of Biological Sciences, University of Quebec at Montreal, Montreal, QC, H3C 3P8, Canada - ISSN：1573-5036
文摘
Background and aims Knowledge related to extent of differing soil N forms and N transformation rates in subtropical southern China is severely limited. Accordingly, the purpose of this study was to investigate if and how tree species of different foliage types (coniferous, deciduous, and evergreen broadleaved) influence N forms and microbial biomass carbon (MBC) and microbial biomass nitrogen (MBN) content as well as gross N transformation rates in the organic and mineral soils of three distinct subtropical forests in China. Methods Chloroform fumigation extraction was used to determine MBC and MBN content while 15N-isotope dilution techniques were used to measure gross N transformation rates. Canonical correspondence analysis (CCA) was used to quantify relationships between soil chemical characteristics and changes in soil N transformation rates. Results Soil N forms, MBC and MBN content, and N transformation rates were found to be significantly different between tree species. Deciduous forest soil exhibited the highest N transformation rates. Soil N transformation rates were closely associated with total soil C and N and MBC and MBN content. Conclusions Soil substrate quantity and soil microbial activity play a more important role in soil N transformation processes than does soil quality in China’s subtropical forests. Tree species type should therefore be taken into account when trying to determine ecosystem N cycling.