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06 - 生物科学(1)
08 - 地球科学;0806 - 海洋科学(1)
0806 - 海洋科学;08 - 地球科学(1)
0903 - 环境生物学;09 - 环境科学(1)
age trends(1)
atmosphere(1)
biological nitrogen fixation(1)
carbon(1)
dendrochronology(1)
free-living nitrogen(1)
geos-chem(1)
global nitrogen cycle(1)
inversions(1)
meta-analysis(1)
oco-2(1)
paleoclimate(1)
quercus(1)
symbiotic nitrogen(1)
terrestrial nitrogen(1)
tm5(1)
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