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Global pattern and controls of biological nitrogen fixation under nutrient enrichment: A meta‐analysis
- Source :
- Global Change Biology. 25:3018-3030
- Publication Year :
- 2019
- Publisher :
- Wiley, 2019.
-
Abstract
- Biological nitrogen (N) fixation (BNF), an important source of N in terrestrial ecosystems, plays a critical role in terrestrial nutrient cycling and net primary productivity. Currently, large uncertainty exists regarding how nutrient availability regulates terrestrial BNF and the drivers responsible for this process. We conducted a global meta-analysis of terrestrial BNF in response to N, phosphorus (P), and micronutrient (Micro) addition across different biomes (i.e, tropical/subtropical forest, savanna, temperate forest, grassland, boreal forest, and tundra) and explored whether the BNF responses were affected by fertilization regimes (nutrient-addition rates, duration, and total load) and environmental factors (mean annual temperature [MAT], mean annual precipitation [MAP], and N deposition). The results showed that N addition inhibited terrestrial BNF (by 19.0% (95% confidence interval [CI]: 17.7%-20.3%); hereafter), Micro addition stimulated terrestrial BNF (30.4% [25.7%-35.3%]), and P addition had an inconsistent effect on terrestrial BNF, i.e., inhibiting free-living N fixation (7.5% [4.4%-10.6%]) and stimulating symbiotic N fixation (85.5% [25.8%-158.7%]). Furthermore, the response ratios (i.e., effect sizes) of BNF to nutrient addition were smaller in low-latitude (30°) biomes (8.5%-36.9%) than in mid-/high-latitude (≥30°) biomes (32.9%-61.3%), and the sensitivity (defined as the absolute value of response ratios) of BNF to nutrients in mid-/high-latitude biomes decreased with decreasing latitude (p ≤ 0.009; linear/logarithmic regression models). Fertilization regimes did not affect this phenomenon (p 0.05), but environmental factors did affect it (p 0.001) because MAT, MAP, and N deposition accounted for 5%-14%, 10%-32%, and 7%-18% of the variance in the BNF response ratios in cold (MAT 15°C), low-rainfall (MAP 2,500 mm), and low-N-deposition (7 kg ha
- Subjects :
- 0106 biological sciences
Nutrient cycle
010504 meteorology & atmospheric sciences
Nitrogen
Forests
Biology
010603 evolutionary biology
01 natural sciences
Grassland
Nutrient
Animal science
Nitrogen Fixation
Environmental Chemistry
Tropical and subtropical moist broadleaf forests
Ecosystem
0105 earth and related environmental sciences
General Environmental Science
Global and Planetary Change
geography
geography.geographical_feature_category
Ecology
Primary production
Nutrients
Tundra
Nitrogen fixation
Terrestrial ecosystem
Subjects
Details
- ISSN :
- 13652486 and 13541013
- Volume :
- 25
- Database :
- OpenAIRE
- Journal :
- Global Change Biology
- Accession number :
- edsair.doi.dedup.....4b59faa722932187aea6df1a65390ea7