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Factors controlling atmospheric methane consumption by temperate forest soils
Author(s) -
Castro Mark S.,
Steudler Paul A.,
Melillo Jerry M.,
Aber John D.,
Bowden Richard D.
Publication year - 1995
Publication title -
global biogeochemical cycles
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.512
H-Index - 187
eISSN - 1944-9224
pISSN - 0886-6236
DOI - 10.1029/94gb02651
Subject(s) - soil water , temperate climate , environmental science , temperate forest , moisture , water content , nitrogen , fertilizer , soil fertility , agronomy , chemistry , soil science , ecology , geology , biology , geotechnical engineering , organic chemistry
Over the past 6 years (1988–1993), we have examined the effects of soil temperature, soil moisture, site fertility, and nitrogen fertilization on the consumption of atmospheric CH 4 by temperate forest soils located at the Harvard Forest in Petersham, Massachusetts. We found that soil temperature is an important controller of CH 4 consumption at temperatures between −5° and 10°C but had no effect on CH 4 consumption at temperatures between 10° and 20°C. Soil moisture exerts strong control on CH 4 consumption over a range of 60 to 100% water‐filled pore space (% WFPS). As moisture increased from 60 to 100% WFPS, CH 4 consumption decreased from 0.1 to 0 mg CH 4 ‐C m −2 h −1 because of gas transport limitations. At 20 to 60% WFPS, site fertility was a strong controller of CH 4 consumption. High‐fertility sites had 2 to 3 times greater CH 4 consumption rates than low‐fertility sites. Nitrogen‐fertilized soils (50 and 150 kg NH 4 NO 3 ‐N ha −1 yr −1 ) had annually averaged CH 4 consumption rates that were 15 to 64% lower than annually averaged CH 4 consumption by control soils. The decrease in CH 4 consumption was related to both the years of application and quantity of nitrogen fertilizer added to these soils.