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Impacts of nitrogen addition on the carbon balance in a temperate semiarid grassland ecosystem.
- Source :
- Biology & Fertility of Soils; Nov2017, Vol. 53 Issue 8, p911-927, 17p
- Publication Year :
- 2017
-
Abstract
- Understanding carbon (C) cycling and sequestration in vegetation and soils, and their responses to nitrogen (N) deposition, is important for quantifying ecosystem responses to global climate change. Here, we describe a 2-year study of the C balance in a temperate grassland in northern China. We measured net ecosystem CO exchange (NEE), net ecosystem production (NEP), and C sequestration rates in treatments with N addition ranging from 0 to 25 g N m year. High N addition significantly increased ecosystem C sequestration, whose rates ranged from 122.06 g C m year (control) to 259.67 g C m year (25 g N). Cumulative NEE during the growing season decreased significantly at high and medium N addition, with values ranging from −95.86 g C m (25 g N) to 0.15 g C m (5 g N). Only the highest N rate increased significantly cumulative soil microbial respiration compared with the control in the dry 2014 growing season. High N addition significantly increased net primary production (NPP) and NEP in both years, and NEP ranged from −5.83 to 128.32 g C m. The C input from litter decomposition was significant and must be quantified to accurately estimate NPP. Measuring C sequestration and NEP together may allow tracking of the effects of N addition on grassland C budgets. Overall, adding 25 or 10 g N m year improved the CO sink of the grassland ecosystem, and increased grassland C sequestration. [ABSTRACT FROM AUTHOR]
- Subjects :
- ARID regions
FORESTS & forestry
CLIMATE change
BIOGEOCHEMICAL cycles
ECOSYSTEMS
Subjects
Details
- Language :
- English
- ISSN :
- 01782762
- Volume :
- 53
- Issue :
- 8
- Database :
- Complementary Index
- Journal :
- Biology & Fertility of Soils
- Publication Type :
- Academic Journal
- Accession number :
- 125580612
- Full Text :
- https://doi.org/10.1007/s00374-017-1233-x