Bibliographic Details
| Title: |
Global distribution and drivers of relative contributions among soil nitrogen sources to terrestrial plants. |
| Authors: |
Hu, Chao-Chen, Liu, Xue-Yan, Driscoll, Avery W., Kuang, Yuan-Wen, Brookshire, E. N. Jack, Lü, Xiao-Tao, Chen, Chong-Juan, Song, Wei, Mao, Rong, Liu, Cong-Qiang, Houlton, Benjamin Z. |
| Source: |
Nature Communications; 7/30/2024, Vol. 15 Issue 1, p1-9, 9p |
| Subject Terms: |
NITROGEN in soils, METEOROLOGICAL precipitation, ATMOSPHERIC deposition, PLANT-soil relationships, CHEMICAL composition of plants |
| Abstract: |
Soil extractable nitrate, ammonium, and organic nitrogen (N) are essential N sources supporting primary productivity and regulating species composition of terrestrial plants. However, it remains unclear how plants utilize these N sources and how surface-earth environments regulate plant N utilization. Here, we establish a framework to analyze observational data of natural N isotopes in plants and soils globally, we quantify fractional contributions of soil nitrate (fNO3-), ammonium (fNH4+), and organic N (fEON) to plant-used N in soils. We find that mean annual temperature (MAT), not mean annual precipitation or atmospheric N deposition, regulates global variations of fNO3-, fNH4+, and fEON. The fNO3- increases with MAT, reaching 46% at 28.5 °C. The fNH4+ also increases with MAT, achieving a maximum of 46% at 14.4 °C, showing a decline as temperatures further increase. Meanwhile, the fEON gradually decreases with MAT, stabilizing at about 20% when the MAT exceeds 15 °C. These results clarify global plant N-use patterns and reveal temperature rather than human N loading as a key regulator, which should be considered in evaluating influences of global changes on terrestrial ecosystems. Isotopic constraints reveal that soil nitrogen contribution to global plants is temperature-controlled, not by precipitation or nitrogen deposition. As temperatures rise, inorganic nitrogen becomes more important and preferred over organic nitrogen. [ABSTRACT FROM AUTHOR] |
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| Database: |
Complementary Index |
