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Library Hierarchical responses of plant stoichiometry to nitrogen deposition and mowing in a temperate steppe

Hierarchical responses of plant stoichiometry to nitrogen deposition and mowing in a temperate steppe

Hierarchical responses of plant stoichiometry to nitrogen deposition and mowing in a temperate steppe

Resource information

Date of publication
december 2014
Resource Language
ISBN / Resource ID
AGRIS:US201400135269
Pages
175-187

BACKGROUND AND AIMS: Stoichiometric relations drive powerful constraints on many ecosystem processes. However, our understanding of the hierarchical responses of plant C:N:P stoichiometry at different levels of biological organization to global change factors remains limited. METHODS: we examined the plant C:N:P stoichiometric responses to N deposition and mowing (hay making) at both species- and community-level by carrying out a 4-year field experiment in the temperate steppe of northern China. RESULTS: Our results showed that N addition and mowing resulted in higher plant N concentrations, lower C:N, and higher N:P at both species- and community-level. Mowing had a limited negative influence on the effects of N addition. We observed divergent responses of both plant P concentrations and C:P to N addition at species-level and community-level: N addition led to higher plant P and lower C:P at species-level, but this effect was not observed at the community-level. CONCLUSIONS: Our results indicate that stoichiometric responses at community-level to N addition and mowing diverge from more traditionally examined species-specific responses. Our results suggest that the hierarchical responses of plant stoichiometry to anthropogenic disturbance deserves more attention when we model the interactions of terrestrial ecosystem C, N, and P cycling under scenarios of increasing N availability concomitantly occurring with active land management.

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Authors and Publishers

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

Han, Xu
Sistla, Seeta A.
Zhang, Yun-Hai
Lü, Xiao-Tao
Han, Xing-Guo

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