期刊
PLANT AND SOIL
卷 396, 期 1-2, 页码 1-26出版社
SPRINGER
DOI: 10.1007/s11104-015-2542-1
关键词
Nitrogen; Nitrogen isotopes; Soil organic matter; Plants; Nutrient supplies; Denitrification; Decomposition
资金
- NEXT program in Japan [GS008]
- National Science Foundation [DEB-1342787]
- Grants-in-Aid for Scientific Research [26252020] Funding Source: KAKEN
Knowledge of biological and climatic controls in terrestrial nitrogen (N) cycling within and across ecosystems is central to understanding global patterns of key ecosystem processes. The ratios of N-15:N-14 in plants and soils have been used as indirect indices of N cycling parameters, yet our understanding of controls over N isotope ratios in plants and soils is still developing. In this review, we provide background on the main processes that affect plant and soil N isotope ratios. In a similar manner to partitioning the roles of state factors and interactive controls in determining ecosystem traits, we review N isotopes patterns in plants and soils across a number of proximal factors that influence ecosystem properties as well as mechanisms that affect these patterns. Lastly, some remaining questions that would improve our understanding of N isotopes in terrestrial ecosystems are highlighted. Compared to a decade ago, the global patterns of plant and soil N isotope ratios are more resolved. Additionally, we better understand how plant and soil N isotope ratios are affected by such factors as mycorrhizal fungi, climate, and microbial processing. A comprehensive understanding of the N cycle that ascribes different degrees of isotopic fractionation for each step under different conditions is closer to being realized, but a number of process-level questions still remain.
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