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Influences of Root Hydraulic Redistribution on N 2 O Emissions at AmeriFlux Sites
Author(s) -
Fu Congsheng,
Lee Xuhui,
Griffis Timothy J.,
Wang Guiling,
Wei Zhongwang
Publication year - 2018
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/2018gl077789
Subject(s) - nitrous oxide , environmental science , greenhouse gas , ecosystem , dry season , atmospheric sciences , redistribution (election) , nitrogen , growing season , agronomy , environmental chemistry , hydrology (agriculture) , zoology , ecology , chemistry , biology , geology , geotechnical engineering , organic chemistry , politics , political science , law
It has long been suspected that root hydraulic redistribution (HR) affects the carbon and nitrogen cycles. Nitrous oxide (N 2 O) is an important greenhouse gas and is the primary stratospheric ozone‐depleting substance. To our knowledge, the influences of HR on N 2 O emissions have not been investigated. Here we use the HR schemes of Ryel et al. and Amenu and Kumar incorporated into CLM4.5 to examine N 2 O emissions at five AmeriFlux sites. The results show that HR reduced N 2 O emissions by 28–92% in the four natural ecosystems experiencing a dry season, whereas it had a very limited effect on the Corn Belt site that has strong emissions but with no distinct dry season. We hypothesize that N 2 O emissions in ecosystems with a distinct dry season are likely overestimated by CENTURY‐based Earth system models.