Soil acidification stimulates the emission of ethylene from temperate forest soils |
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| Authors: | Xingkai Xu Inubushi Kazuyuki |
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| Institution: | [1]State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029 [2]Graduate School of Horticulture, Chiba University, Matsudo, Chiba 271-8510, Japan |
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| Abstract: | Soil acidification via acid precipitation is recognized to have detrimental impacts on forest
ecosystems, which is in part associated with the function of ethylene released from the soil. However,
the impacts of acidification on the cycling of ethylene in forest soils have not been fully taken into
consideration in global change studies. Forest topsoils (0--5 cm) under four temperate forest stands
were sampled to study the effects of a pH change on the emissions of ethylene and carbon dioxide from
the soils and concentrations of dissolved organic carbon (DOC) released into the soils. Increasing
acidification or alkalinization of forest soils could increase concentrations of DOC released into the
soils under anoxic and oxic conditions. The ethylene emission from these forest topsoils could significantly
increase with a decreasing pH, when the soils were acidified experimentally to a pH<4.0, and it
increased with an increasing concentration of DOC released into the soils, which was different from
the carbon dioxide emission from the soils. Hence, the short-term stimulating responses of ethylene
emission to a decreasing pH in such forest soils resulted from the increase in the DOC concentration
due to acidification rather than carbon mineralization. The results would promote one to study the
effects of soil acidification on the cycling of ethylene under different forest stands, particularly
under degraded forest stands with heavy acid depositions. |
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| Keywords: | soil acidification carbon dioxide dissolved organic carbon ethylene emission volcanic soil |
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