期刊
BIOLOGY AND FERTILITY OF SOILS
卷 53, 期 4, 页码 397-406出版社
SPRINGER
DOI: 10.1007/s00374-017-1188-y
关键词
Enzyme; Microbial biomass; Microbial respiration; Nitrogen addition; Phosphorus addition; Stoichiometry
类别
资金
- National Key Research and Development Program of China [2016YFD0600201]
- Program for Changjiang Scholars and Innovative Research Team in University [IRT_15R09]
- Fundamental Research Funds for the Central Universities [2572016AA08]
The ratios of soil carbon (C) to nitrogen (N) and C to phosphorus (P) are much higher in Chinese temperate forest soils than in other forest soils, implying that N and P might limit microbial growth and activities. The objective of this study was to assess stoichiometric responses of microbial biomass, enzyme activities, and respiration to N and P additions. We conducted a nutrient (N, P, and N + P) addition experiment in two temperate soils under Korean pine (Pinus koraiensis) plantation and natural broadleaf forest in Northeast China and measured the microbial biomass C, N, P; the activities of beta-glucosidase (BG), N-acetyl-beta-glucosaminidase (NAG), and acid and alkaline phosphomonoesterase (AP); and the microbial respiration in the two soils. Nitrogen addition increased microbial biomass N and decreased microbial biomass C-to-N ratio and microbial respiration in the two soils. Nitrogen addition decreased NAG activity to microbial biomass N ratio, P addition decreased AP activity to microbial biomass P ratio, and N, P, and N + P additions all increased BG activity to microbial biomass C ratio. These results suggest that microbial stoichiometry is not strictly homeostatic in response to nutrient additions, especially for N addition. The responses of enzyme activities to nutrient additions support the resource allocation theory. The N addition induced a decline in microbial respiration, implying that atmospheric N deposition may reduce microbial respiration, and consequently increase soil C sequestration in the temperate region.
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