Journal
GEODERMA
Volume 329, Issue -, Pages 61-64Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.geoderma.2018.05.019
Keywords
N deposition; Ecoenzymatic stoichiometry; C limitation; Nutrient limitation
Categories
Funding
- National Key Research and Development Program of China [2016YFC0502404]
- National Science Foundation of Guangxi Province of China [2017GXNSFAA198038]
- National Natural Science Foundation of China [31500405]
- Chinese Academy of Sciences through its One Hundred Talent Program [Y523101030]
- Chinese Academy of Sciences through its Light of West China Program
- Youth Innovation Team Project of ISA, CAS [2017QNCXTD_ZJ]
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Nitrogen (N) deposition may change carbon (C) or nutrient limitation of soil microbes, but whether such change can be reflected by ecoenzymatic stoichiometry has not been well studied. Here, we synthesized data from 36 published studies to evaluate the responses of ecoenzymatic stoichiometry to N addition. Results showed that N addition did not change the enzyme ratio (1:1:1) of C, N, and phosphorus (P) acquisition, and also did not change vector angle of ecoenzymatic stoichiometry which is an indicator of microbial P limitation. However, N addition increased two indicators of C-limitation significantly (i.e., activity of (beta-(D) -glucosidase and vector length), both of which indicated that N addition aggravated microbial C-limitation. The aggravated C-limitation may be partly due to the reduced decomposition of recalcitrant organic C. Our study extends our understanding of the effects of N deposition on C cycling from a new perspective.
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