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Bibliothèque Soil microbial biomass, community composition and soil nitrogen cycling in relation to tree species in subtropical China

Soil microbial biomass, community composition and soil nitrogen cycling in relation to tree species in subtropical China

Soil microbial biomass, community composition and soil nitrogen cycling in relation to tree species in subtropical China

Resource information

Date of publication
Décembre 2013
Resource Language
ISBN / Resource ID
AGRIS:US201500007999
Pages
68-75

We investigated microbial biomass and composition (lipid profile), mineral N pools and soil physicochemical parameters in the top 5-cm soils 19 years after reforestation of Chinese fir (Cunninghamia lanceolata (Lamb.) Hook) woodland with itself or a native broadleaf species, Mytilaria laosensis. The results suggested that tree species transition had a large impact on microbial biomass and a small impact on the composition of the microbial community as indicated by the relative abundance of individual lipid biomarkers. Between November 2011 and October 2012, there was on average 50% greater microbial biomass carbon (C) measured by the fumigation extraction procedure under M. laosensis than under C. lanceolata. A one-time measurement of phospholipid fatty acids in soil samples collected in May 2012 suggested M. laosensis plots had greater content of individual lipid biomarkers than C. lanceolata plots. Using a litter manipulation experiment, we found that the increases in content of lipid biomarkers under M. laosensis can be attributed to changed litter chemistry. Analysis of soil mineral N pools indicated that there were significantly lower [Formula: see text] and [Formula: see text] pools as well as potential net N mineralization rates in M. laosensis soil than in C. lanceolata soil. The relationships among N dynamics, soil chemistry and microbial properties were analysed. The results suggested tree species induced differences in soil N mineralization rates and mineral N pools were related to labile C availability, soil C:N ratio and the composition of the microbial community. Our data of mineral N pools and soil δ¹⁵N implied that the transition of land use from C. lanceolata to M. laosensis leads to an enhanced N retention in the plantation.

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Authors and Publishers

Author(s), editor(s), contributor(s)

Huang, Zhiqun
Wan, Xiaohua
He, Zongming
Yu, Zaipeng
Wang, Minghuang
Hu, Zhenhong
Yang, Yusheng

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